java-programmer >>Basic java program structure; Was: Problems with multidimensional arrays and global variables

Basic java program structure; Was: Problems with multidimensional arrays and global variables

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- 5
  - what's wrong with my component? i make a new component which is a dragable icon here is my piece of
    code
    
    //class: DragAbleComponent.the father of my component
    
    import java.awt.Graphics;
    import java.awt.event.FocusEvent;
    import java.awt.event.FocusListener;
    import java.awt.event.MouseEvent;
    import java.awt.event.MouseListener;
    import java.awt.event.MouseMotionListener;
    
    import javax.accessibility.Accessible;
    import javax.swing.JComponent;
    
    public abstract class DragAbleComponent extends JComponent implements
    MouseListener,
    FocusListener, Accessible ,MouseMotionListener{
    private int X;
    
    private int Y;
    
    /**
    *
    */
    private static final long serialVersionUID = 1L;
    
    public void mouseClicked(MouseEvent e) {
    this.requestFocusInWindow();
    
    }
    
    public void mouseEntered(MouseEvent e) {}
    
    public void mouseExited(MouseEvent e) {}
    
    public void mousePressed(MouseEvent e) {}
    
    public void mouseReleased(MouseEvent e) {}
    
    public void focusGained(FocusEvent e) {
    this.repaint();}
    
    public void focusLost(FocusEvent e) {
    this.repaint();}
    
    protected abstract void paintComponent(Graphics graphics);
    
    public int getX() {
    return X;
    }
    
    public void setX(int x) {
    X = x;
    }
    
    public int getY() {
    return Y;
    }
    
    public void setY(int y) {
    Y = y;
    }
    }
    
    //class:DragableIcon the component
    
    import java.awt.Color;
    import java.awt.Graphics;
    import java.awt.Image;
    import java.awt.event.InputEvent;
    import java.awt.event.MouseEvent;
    
    import javax.swing.Action;
    import javax.swing.ActionMap;
    import javax.swing.InputMap;
    import javax.swing.JComponent;
    import javax.swing.KeyStroke;
    import javax.swing.TransferHandler;
    
    public class DragableIcon extends DragAbleComponent {
    
    private Image image;
    
    private MouseEvent firstMouseEvent = null;
    
    private static boolean installKeyBordMapings = true;
    /**
    *
    */
    private static final long serialVersionUID = 1L;
    
    public DragableIcon(Image image) {
    super();
    this.image = image;
    this.setFocusable(true);
    this.addMouseListener(this);
    this.addFocusListener(this);
    this.addMouseMotionListener(this);
    this.initKeyBordMaping();
    
    }
    
    private void initKeyBordMaping(){
    if (installKeyBordMapings) {
    InputMap imap = this.getInputMap();
    // imap.put(KeyStroke.getKeyStroke("ctrl X"),
    //
    TransferHandler.getCutAction().getValue(Action.NAME));
    imap.put(KeyStroke.getKeyStroke("ctrl C"),
    
    TransferHandler.getCopyAction().getValue(Action.NAME));
    imap.put(KeyStroke.getKeyStroke("ctrl V"),
    
    TransferHandler.getPasteAction().getValue(Action.NAME));
    }
    
    ActionMap map = this.getActionMap();
    //
    map.put(TransferHandler.getCutAction().getValue(Action.NAME),
    // TransferHandler.getCutAction());
    map.put(TransferHandler.getCopyAction().getValue(Action.NAME),
    TransferHandler.getCopyAction());
    
    map.put(TransferHandler.getPasteAction().getValue(Action.NAME),
    TransferHandler.getPasteAction());
    }
    @Override
    protected void paintComponent(Graphics graphics) {
    Graphics g = graphics.create();
    
    //Draw in our entire space, even if isOpaque is false.
    g.setColor(Color.WHITE);
    g.fillRect(0, 0, image == null ? 125 : image.getWidth(this),
    image == null ? 125 : image.getHeight(this));
    
    if (image != null) {
    //Draw image at its natural size of 125x125.
    g.drawImage(image, 0, 0, this);
    }
    
    //Add a border, red if picture currently has focus
    if (isFocusOwner()) {
    g.setColor(Color.RED);
    } else {
    g.setColor(Color.BLACK);
    }
    g.drawRect(0, 0, image == null ? 125 : image.getWidth(this),
    image == null ? 125 : image.getHeight(this));
    // g.drawImage(image, 0, 0, this);
    g.dispose();
    
    }
    
    public void mouseDragged(MouseEvent e) {
    
    //Don't bother to drag if the component displays no image.
    if (image == null) return;
    
    if (firstMouseEvent != null) {
    e.consume();
    
    //If they are holding down the control key, COPY rather
    than MOVE
    int ctrlMask = InputEvent.CTRL_DOWN_MASK;
    int action = ((e.getModifiersEx() & ctrlMask) == ctrlMask)
    ?
    TransferHandler.COPY : TransferHandler.MOVE;
    
    int dx = Math.abs(e.getX() - firstMouseEvent.getX());
    int dy = Math.abs(e.getY() - firstMouseEvent.getY());
    //Arbitrarily define a 5-pixel shift as the
    //official beginning of a drag.
    if (dx > 5 || dy > 5) {
    //This is a drag, not a click.
    JComponent c = (JComponent)e.getSource();
    TransferHandler handler = c.getTransferHandler();
    //Tell the transfer handler to initiate the drag.
    handler.exportAsDrag(c, firstMouseEvent, action);
    firstMouseEvent = null;
    }
    }
    
    }
    
    public void mouseMoved(MouseEvent e) {}
    
    public void mousePressed(MouseEvent e) {
    //Don't bother to drag if there is no image.
    if (image == null) return;
    
    firstMouseEvent = e;
    e.consume();
    }
    
    public void mouseReleased(MouseEvent e) {
    firstMouseEvent = null;
    }
    
    public static boolean isInstallKeyBordMapings() {
    return installKeyBordMapings;
    }
    
    public static void setInstallKeyBordMapings(boolean
    installKeyBordMapings) {
    DragableIcon.installKeyBordMapings = installKeyBordMapings;
    }
    
    public Image getImage() {
    return image;
    }
    
    public void setImage(Image image) {
    this.image = image;
    }
    }
    
    //and here is my pane
    
    import java.awt.BorderLayout;
    import java.awt.event.ItemEvent;
    import java.awt.event.ItemListener;
    
    import javax.swing.ImageIcon;
    import javax.swing.JPanel;
    import javax.swing.JToolBar;
    
    import cn.com.ynld.bms.applet.gui.handler.IconTransferHandler;
    import cn.com.ynld.bms.applet.service.TransfAble;
    import cn.com.ynld.bms.applet.service.UpdateAble;
    
    public class ElectronicPane extends JPanel
    implements ItemListener,UpdateAble{
    private UpdateAble updateAble = null;
    
    private ScrollAbleImage image;
    private JToolBar toolBar;
    private IconTransferHandler handler;
    /**
    *
    */
    private static final long serialVersionUID = 1L;
    
    public ElectronicPane(){
    
    super(new BorderLayout());
    handler = new IconTransferHandler();
    this.creatToolBar();
    this.add(this.toolBar);
    this.setTransferHandler(handler);
    
    }
    
    public void itemStateChanged(ItemEvent e) {}
    
    public void addTransferAble(String key, TransfAble transferAble) {
    // TODO
    
    }
    
    public TransfAble getTransferAble(String key) {
    // TODO
    return null;
    }
    
    public void removeTransferAble(String key) {
    this.updateAble.removeTransferAble(key);
    
    }
    
    public void update(UpdateAble updateAble) {
    this.updateAble = updateAble;
    this.init();
    
    }
    
    private void init(){
    this.image = new ScrollAbleImage();
    this.image.update(updateAble);
    this.add(image,BorderLayout.CENTER);
    this.repaint();
    //this.image.repaint();
    }
    
    private void creatToolBar(){
    
    this.toolBar = new JToolBar();
    
    DragableIcon alarm = new
    DragableIcon(createImageIcon("/root/Desktop/drawing/png-0003.png",
    "alarm").getImage());
    alarm.setTransferHandler(handler);
    
    DragableIcon damage = new
    DragableIcon(createImageIcon("/root/Desktop/drawing/png-0007.png",
    "device").getImage());
    alarm.setTransferHandler(handler);
    this.toolBar.add(alarm);
    this.toolBar.addSeparator();
    this.toolBar.add(damage);
    this.toolBar.setFloatable(false);
    
    }
    
    /** Returns an ImageIcon, or null if the path was invalid. */
    protected static ImageIcon createImageIcon(String path,
    String description) {
    // java.net.URL imageURL =
    DragPictureDemo.class.getResource(path);
    
    if (path == null) {
    System.err.println("Resource not found: "
    + path);
    return null;
    } else {
    return new ImageIcon(path, description);
    }
    }
    
    }
    
    the problem is i add DragableIcons to my toolbar but only the first
    icon can be seen!!!!
    what's wrong
    thanks for any help!
- 5
  - XML Validation with JavaHi
    
    For several days I've been trying to validate a very simple XML-Document
    against an XML Schema - so far without success. I've tried several
    approaches, using libraries like Xerces, JAXP and an Oracle-library, but
    none of those worked the way for example XML Spy works.
    
    Here is my Schema:
    
    <?xml version="1.0" encoding="UTF-8"?>
    <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:element name="root"/>
    </xsd:schema>
    
    This is the (invalid) XML-File that references the schema: <?xml
    version="1.0" encoding="UTF-8"?> <root
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation='test.xsd'> <a></a> </root>
    This is my first try to validate the Document against the schema:
    
    try { DOMParser parser = new DOMParser();
    parser.setFeature("http://xml.org/sax/features/validation",true);
    parser.setFeature("http://apache.org/xml/features/validation/schema",true);
    parser.setFeature("http://apache.org/xml/features/validation/schema-full-che
    cking",true); parser.parse("C:\\test.xml"); }
    catch(Exception ex) { ex.printStackTrace(); }
    
    This runs without problems, however, it doesn't report a validation-error.
    
    My second try:
    
    try { SAXParserFactory parserFct =
    SAXParserFactory.newInstance(); parserFct.setValidating(true);
    parserFct.setFeature("http://xml.org/sax/features/validation", true);
    parserFct.setFeature("http://apache.org/xml/features/validation/schema",
    true);
    parserFct.setFeature("http://apache.org/xml/features/validation/schema-full-
    checking",true); javax.xml.parsers.SAXParser parser =
    parserFct.newSAXParser(); parser.parse("C:\\test.xml", new
    MyHandlerBase()); } catch(Exception ex)
    { ex.printStackTrace(); }
    This is the Errorhandler I used:
    
    class MeinErrorHandler implements ErrorHandler{ boolean b = false;
    public void warning(SAXParseException e) throws SAXException {
    System.out.println("WARNUNG: " + e); b = true; } public void
    error(SAXParseException e) throws SAXException {
    System.out.println("FEHLER: " + e); b = true; } public void
    fatalError(SAXParseException e) throws SAXException {
    System.out.println("LEIDER, LEIDER, AUS: " + e); } public boolean
    warninghappened(){ return b; }}
    
    Again, no validation-error.
    
    My third try:
    
    InputSource is = null; DOMParser parser = new DOMParser();
    Document doc = null; try {
    parser.setFeature("http://xml.org/sax/features/validation",true);
    parser.setFeature("http://apache.org/xml/features/validation/schema",true);
    parser.setFeature("http://apache.org/xml/features/validation/schema-full-che
    cking",true);
    parser.setProperty("http://apache.org/xml/properties/schema/external-noNames
    paceSchemaLocation", "C:\\test.xsd" ); is = new
    InputSource(new FileReader("C:\\test.xml"));
    parser.parse(is); } catch(Exception ex)
    { ex.printStackTrace(); }
    
    Again, no validation-error.
    
    My fourth try involved the oracle.xml.parser.schema and
    oracle.xml.parser.v2-packages.
    Here is the code:
    
    public void process(String xsdURI, String xmlURI) throws Exception
    {
    XSDBuilder builder = new XSDBuilder();
    URL url = createURL(xsdURI);
    // Build XML Schema Object
    XMLSchema schemadoc = (XMLSchema) builder.build(url);
    DOMParser dp = new DOMParser();
    url = createURL(xmlURI);
    // Set Schema Object for Validation
    dp.setXMLSchema(schemadoc);
    dp.setValidationMode(XMLParser.SCHEMA_VALIDATION);
    dp.setPreserveWhitespace(true);
    dp.setErrorStream(System.out);
    try
    {
    System.out.println("Parsing " + xmlURI);
    dp.parse(url);
    System.out.println("The input file <" + xmlURI + "> parsed
    without errors");
    }
    catch (XMLParseException pe)
    {
    System.out.println("Parser Exception: " + pe.getMessage());
    }
    catch (Exception e)
    {
    System.out.println("NonParserException: " + e.getMessage());
    }
    }
    
    This worked fine with the test.xml-Document, however, when I tried to
    validate a more complex document which used keys and key-references, it
    couldn't validate the Document although XML-Spy had no problem with it.
    
    Am I missing something here? Does anybody know those problems and has a
    solution for it, or perhaps a sample-code that works? Any help would be
    greatly appreciated.
    
    Thanks in advance
    Mathias Winklhofer
- 5
  - OutOfMemoryError problemHi,
    
    I am a user of cruisecontrol ( continuous integration server). As long
    as I have used it I have had problems with
    java.lang.OutOfMemoryError's. I have gotten numerous ideas on how to
    handle it. Some
    resonable and some more unrealistic. However lately I dicided that I
    need to dig deeper into this.
    I use two ways to perform build and test. Both ways use the same 'ant'
    and the same 'build file'.
    The difference is in how the build is triggered.
    
    Shell script
    =========
    
    Here I use a shell script to start ant.
    java -Xms512M -Xmx756M -classpath .......
    
    Cruisecontrol
    ==========
    
    Here I start cruisecontrol ( a java program) that starts ant.
    I set Xms and Xmx for cruisecontrol as well as ant.
    
    When I execute the shell script the 'junit' and 'junitreport' tasks
    execute nicely.
    
    On the other hand when I execute 'cruisecontrol' I get a
    java.lang.OutOfMemoryError when I execute the 'junit-report'.
    
    Trace:
    --------
    BUILD FAILED
    java.lang.OutOfMemoryError
    at
    org.apache.tools.ant.Project.executeSortedTargets(Project.java:1225)
    at
    org.apache.tools.ant.Project.executeTarget(Project.java:1185)
    at
    
    org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecut
    or.java:40)
    at
    org.apache.tools.ant.Project.executeTargets(Project.java:1068)
    at org.apache.tools.ant.Main.runBuild(Main.java:668)
    at org.apache.tools.ant.Main.startAnt(Main.java:187)
    at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
    at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)
    Caused by: java.lang.OutOfMemoryError
    --- Nested Exception ---
    java.lang.OutOfMemoryError
    
    I did some investigation in ant ( source code ) and found out the each
    junit test suite result ( xml-file) is merged into one big xml file.
    
    There are two steps in the code. Step 1 works ok! Step 2 is failing
    siince the big merged file is not complete. Could it be something with
    the jvm?
    
    All hints are welcome.
    
    cheers,
    
    //mikael
    
    Step 1 - creating the dom document
    -------------------------------------------
    
    protected Element createDocument() {
    // create the dom tree
    DocumentBuilder builder = getDocumentBuilder();
    Document doc = builder.newDocument();
    Element rootElement = doc.createElement(TESTSUITES);
    doc.appendChild(rootElement);
    
    generatedId = 0;
    
    // get all files and add them to the document
    File[] files = getFiles();
    for (int i = 0; i < files.length; i++) {
    File file = files[i];
    try {
    log("Parsing file: '" + file + "'",
    Project.MSG_VERBOSE);
    if(file.length()>0) {
    Document testsuiteDoc
    =
    builder.parse(FileUtils.getFileUtils().toURI(files[i].getAbsolutePath()));
    Element elem = testsuiteDoc.getDocumentElement();
    // make sure that this is REALLY a testsuite.
    if (TESTSUITE.equals(elem.getNodeName())) {
    addTestSuite(rootElement, elem);
    generatedId++;
    } else {
    //wrong root element name
    // issue a warning.
    log("the file " + file
    + WARNING_INVALID_ROOT_ELEMENT,
    Project.MSG_WARN);
    }
    } else {
    log("the file " + file
    + WARNING_EMPTY_FILE,
    Project.MSG_WARN);
    }
    } catch (SAXException e) {
    // a testcase might have failed and write a zero-length
    document,
    // It has already failed, but hey.... mm. just put a
    warning
    log("The file " + file + WARNING_IS_POSSIBLY_CORRUPTED,
    Project.MSG_WARN);
    log(StringUtils.getStackTrace(e), Project.MSG_DEBUG);
    } catch (IOException e) {
    log("Error while accessing file " + file + ": "
    + e.getMessage(), Project.MSG_ERR);
    }
    }
    return rootElement;
    }
    
    Step 2 - write the DOM Tree to file
    ----------------------------------------
    
    protected void writeDOMTree(Document doc, File file) throws IOException
    {
    OutputStream out = null;
    PrintWriter wri = null;
    try {
    out = new BufferedOutputStream(new FileOutputStream(file));
    wri = new PrintWriter(new OutputStreamWriter(out, "UTF8"));
    wri.write("<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n");
    (new DOMElementWriter()).write(doc.getDocumentElement(),
    wri, 0, " ");
    wri.flush();
    // writers do not throw exceptions, so check for them.
    if (wri.checkError()) {
    throw new IOException("Error while writing DOM
    content");
    }
    } finally {
    FileUtils.close(wri);
    FileUtils.close(out);
    }
    }
- 6
  - KeyRelease Event affects next Internal FrameHi,
    I am working on an MDI application using JInternalFrames. I have
    forms to fill that have the 'Next', 'Back' and 'Cancel' buttons. I am
    assigning key presses (Enter, Alt+left and Esc respectively) through
    KeyRelease event. In addition, the 'Next' button is assigned as the
    default button using
    this.getRootPane().setDefaultButton(btnOK). However, I find that when
    I run the program and press the Enter key, after accepting the enter
    and processing the button action, it loads the next JInternalFrame and
    appears to call the KeyRelease event for this form too. Since I have
    entries that must be filled, this raises errors that entries are not
    filled.
    Can anyone tell me what I am doing wrong.
    Thanks in advance,
    Arun Kumar Srinivasan
- 6
  - Registering Connector/J driverHi. I have
    - mySQL 1.4
    - Connector/J 3.0.15
    
    I want to use Java to query mySQL database via Connector/J.
    
    Connector/J documentation at
    http://dev.mysql.com/doc/connector/j/en/index.html instructs to
    compile and run the following Java code to register the Connector/J
    driver:
    
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.SQLException;
    
    // Notice, do not import com.mysql.jdbc.*
    // or you will have problems!
    
    public class LoadDriver {
    public static void main(String[] args) {
    try {
    // The newInstance() call is a work around for some
    // broken Java implementations
    
    Class.forName("com.mysql.jdbc.Driver").newInstance();
    } catch (Exception ex) {
    // handle the error
    }
    }
    }
    // Error:
    // SQLJConnectorRegister1failed.java:8:
    // class LoadDriver is public, should be declared in a file named
    // LoadDriver.java
    
    Where should I have this LoadDriver class/java file? It doesn't come
    with any of the packages I have (java.sql.* or connector/J driver
    classes). Hence I can't "supply a class that implements Driver
    interface" which would I gather register the driver. I have set the
    classpath to the driver's jar, so it should find that class.
    
    *
    And then SQL queries would be possible. That would be an achievement
    as such, never loaded/registered a driver in my life, or programmed
    much anyway.
    
    Appreciate any help over this.
    Best, Harri S
    Finland
    language technologist
- 7
  - Problems with tomcatHi guys, I have some problems, I'm trying to run tomcat in windows
    2000 pro and actually it runs but when I use the browser http://localhost:
    doesn't work, What should be the problem? I've changed the port to 80
    but still having the same problem. Thx in advance
- 8
  - bypassing IISHi
    
    We have an architecture where users log in to their
    "windows" pcs using Microsoft Active Directory
    and requests are then sent as follows:
    
    client -> IIS -> Tomcat
    
    An isapi redirector resides at IIS which forwards the request to
    Tomcat.
    
    isapi redirect would appear to populate the HTTP header with
    the user's credentials.
    
    My question is: how can we avoid the overhead of IIS
    and send requests directly to Tomcat for authentication against the
    ldap server as before.
    
    (The issue I see is how to populate the HTTP header with the
    user details?)
    
    Regards
- 8
  - How to stop output to stdoutHi,
    I am using RXTXcomm to communicate with the serial interface. My
    programs output this everytime the RXTXcomm library is loaded:
    
    Stable Library
    =========================================
    Native lib Version = RXTX-2.1-7
    Java lib Version = RXTX-2.1-7
    
    I don't like this output anytime the program runs. I tried to redirect
    System.out but it didn't work. Does anybody know how to put RXTXcomm
    into "silent mode"?
    
    Thanks, Juergen
- 8
  - stringtokenizer that traps ASCII linebreaksDear all,
    
    How do i define a stringtokenizer that traps chr13, chr10 combinations?
    
    tia
    WS
- 8
  - Little problem with ant install taskHi,
    
    I found out that i can use ant for installing my web application.
    great, I have copied some code from an example and added the taskdef's
    to the top of my build.xml.
    Then I copied the catalina-ant.jar into my java classpath.
    
    But when I run it, I get :
    "A class needed by class org.apache.catalina.ant.InstallTask cannot be
    found: org/apache/tools/ant/Task"
    
    I looked into the catalina-ant.jar and could not find a Task class
    indeed, but then, where is it...?
    
    Taskdef:
    <taskdef name="install"
    classname="org.apache.catalina.ant.InstallTask" />
    <taskdef name="remove"
    classname="org.apache.catalina.ant.RemoveTask" />
    Target:
    <target name="install" depends="war" description="Install servlet
    on tomcat.kochan.de">
    <install url="${tomcat.url}" username="${manager.username}"
    password="${manager.password}" path="${app.path}"
    war="jar:file:/${war.dir}/${project}.war!/" />
    <sleep seconds="2"/>
    </target>
    
    Thanks for help!
    Werner
- 10
  - Open Source Distributive Cache solutionHi,
    
    I am looking for an open source's distributive cache solution. One that
    can be used for a clustered weblogic servers environment, the cache has
    to be read and write, and the cache itself need to be fail-safe.
    
    Anyone has some recommandations?
    
    Thanks,
    
    Edmond
- 11
  - use my JSP custom tag on click of buttonI have written a custom tag in a jsp
    
    <test:attribs attribNames="<%=aenum%>">
    <li> <b><%=aenum.nextElement()%></b>
    </test:attribs>
    
    It lists the request attributes.
    
    Now i want the to list the same on click of a button or say on clicking
    on an image( or consider for some specified event of a HTML component)
    
    Can i use the custom tag for the same and if yes how?
    
    Regards,
- 11
  - java.util.zip not handling Unicode filenamesI have a zip file that contains files with Asian filenames.
    java.util.zip.ZipFile opens it, but the filenames are garbled. Is there any
    way to handle filenames that contain unicode characters?
- 12
  - Server-side tools surveyI'm currently working with JBoss/Tomcat, PostgreSQL, NetBeans, Struts,
    XDoclet, Ant, JUnit, JUnitEE...and a few things I've probably forgotten
    to mention.
    
    What tools do *you* consider necessary for web application development?
    --
    Phillip Mills
    Multi-platform software development
    (416) 224-0714
    
    -----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
    http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
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- 14
  - problems with getting blob from databaseI`m writing from file to blob. Than I need to get blob content again
    and write it to file. When I open this file, I see the wrong symbols.
    Can anybody help me?
    Here is my code:
    
    ////////////////////////////
    to update file content
    ///////////////////////////
    
    private void updateFileContent(File serverFile, java.io.File
    clientContentFile) throws MainException
    {
    PreparedStatement preparedStatement = null;
    try
    {
    
    connection = connect();
    String query = "update panta_file_substance\n" +
    "set content = ?\n" +
    "where\n" +
    " file_id = ?"
    preparedStatement = getPreparedStatement
    (query, connection);
    
    int fileLenght = (int) clientContentFile.length();
    InputStream is = new FileInputStream(clientContentFile);
    preparedStatement.setBinaryStream(1, is, fileLenght);
    preparedStatement.setLong( 2,
    serverFile.getId().longValue() );
    int result = preparedStatement.executeUpdate();
    is.close();
    }
    catch (SQLException e)
    { throw new MainException(e.getMessage(), e); }
    
    catch (FileNotFoundException e)
    { throw new MainException(e.getMessage(), e); }
    
    catch (IOException e)
    { throw new MainException(e.getMessage(), e); }
    
    finally
    {
    disconnect(null, preparedStatement, null);
    }
    }
    
    //////////////////////////////////////////////////////////////////////////
    to get file
    /////////////////////////////////////////////////////////////////////////
    
    public static void getFile(Connection connection) throws
    SQLException
    {
    String query = "select \n" +
    " panta_file_substance.content \n" +
    "from \n" +
    " panta_file_substance\n" +
    "where \n" +
    " file_id=?";
    PreparedStatement preparedStatement = connection.
    prepareStatement(ServerSQLProjectDAO.getFileContent());
    preparedStatement.setLong(1, 7801295236381635588l);
    ResultSet resultSet = preparedStatement.executeQuery();
    Blob content = null;
    if (resultSet.next())
    {
    content = (Blob) resultSet.getBlob("CONTENT");
    }
    java.io.File contentffFile = new java.io.File("C:\\Temp\\new");
    try
    {
    OutputStream os = new FileOutputStream(contentffFile);
    int bufferSize = 2048;
    byte[] array = new byte[bufferSize];
    BufferedOutputStream bos = new BufferedOutputStream(os,
    bufferSize);
    
    InputStream is = content.getBinaryStream();
    BufferedInputStream bis = new BufferedInputStream(is);
    
    int nBytes;
    
    while ((nBytes = bis.read(array)) != -1)
    bos.write(array, 0, nBytes);
    
    bos.close();
    bis.close();
    }
    catch (IOException e)
    {
    e.printStackTrace();
    }
    
    }

Author

Message

Don Freeman

Posted: 2005-2-12 7:03:00

Top

java-programmer, Basic java program structure; Was: Problems with multidimensional arrays and global variables <top posting seemed more appropriate for this post>.

Being a Java newbie and having been struggling with the basic concepts of
the structure of a java program (as well as "static") I would like to say
that this is the best example I have seen so far of the basic form of a java
program. Nice, simple and after reading it I think I finally understand
what is going on. I have read far too many books and examples that seem to
enjoy obfuscating the concept they are trying to explain with way too many
extraneous details.

Thank you.
Don Freeman

If this group has a FAQ I nominate the following for entry:

"Carl" <email***@***.com> wrote in message
news:fS8Pd.3241$email***@***.com...

> In short, static members do not belong to an object. You do not need to
> create an object to access the members. The main() method must be static
> since it will be the first method called and there will not yet have been
> a chance for you to create any objects. IMO, the main method should then
> proceed to operate on OBJECTS, unless you have a good reason for using
> static.
>
> A simple class example would be as follows:
> // code -->
> public class Foo {
>
> // this can be accessed by any of Foo's methods
> private int someVariable;
>
> // This gets called when a new Foo object is created.
> public Foo(){
> // do initial setup
> }
>
> public void runProgram(){
> // start doing your processing
> }
>
> public static void main(String[] args) {
> // process args[]
>
> Foo foo = new Foo(); // create an instance of the Foo class.
> foo.runProgram(); // start running the Foo class.
> }
> }
> // <-- end code

Index ‹ java-programmer

Next
- 1
  - Cannot draw on mutable imageHi,
    
    I got a problem with drawing on an image created with the
    createImage(int width, int height) method. I use MIDP 1.0 and
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- 2
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    Hallo, here is my question. I have a Java API
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- 3
  - SourceDataLine ProblemA while back I implemented sound using javax.sound.sampled into my Tandy
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    take the values written to the DAC and then feed them (although at a
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- 4
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- 5
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    *** CNHC *** CNHC *** CNHC ***
    
    Trade Date: Friday, November 24, 2006
    Company: China Health Management Corp.
    Symbol: CNHC
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    an image of peace.
    Sometimes they were sweet, sometimes they were bitter, and they were
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    But US scientists report they have now isolated these cell-like
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    Find out how to make a charming and unique windchime that will make your
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    Zakaria might not be enhancing the global image of Islam in the manner
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    Zakaria might not be enhancing the global image of Islam in the manner
    majority world Muslims would prefer: an image of peace.
    I beg your Majesty's pardon, replied the fox, but I noticed the track of
    the animals that have already come to you, and while I see many hoof
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    --
    To UNSUBSCRIBE, email to email***@***.com
    with a subject of "unsubscribe". Trouble? Contact email***@***.com
- 6
  - Trying to create a database in a MS Access DB via JDBC drivers. I am trying to create a database in a MS Access DB via JDBC drivers.
    I have tried both sun.jdbc.odbc.JdbcOdbcDriver and ids.sql.IDSDriver
    
    From some reason both drivers Exceptions tell me 'Syntax error in
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    Database
    
    // - - - - - - - - - - - - sun.jdbc.odbc.JdbcOdbc
    aSQL=CREATE DATABASE dbtest;
    java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver]
    Syntax error in CREATE TABLE statement.
    at sun.jdbc.odbc.JdbcOdbc.createSQLException(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbc.standardError(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbc.SQLExecDirect(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbcStatement.execute(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbcStatement.executeUpdate(Unknown
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    at JDL00.main(JDL00.java:505)
    
    // - - - - - - - - - - - - ids.sql
    aSQL=CREATE DATABASE dbtest;
    java.sql.SQLException: [42000][Microsoft][ODBC Microsoft Access
    Driver] Syntax error in CREATE TABLE statement
    at ids.sql.IDSSocket.error(IDSSocket.java:374)
    at ids.sql.IDSSocket.verify(IDSSocket.java:320)
    at ids.sql.IDSStatement.submit(IDSStatement.java:157)
    at ids.sql.IDSStatement.execute(IDSStatement.java:479)
    at ids.sql.IDSStatement.executeUpdate(IDSStatement.java:270)
    at JDBCDL00.createCtlg(JDL00.java:200)
    at JDL00.main(JDL00.java:505)
    
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    kind of a file base Data Store?
    
    There is also something I don't quite know how to interpret.
    
    When you ask the JdbcOdbc driver for Catalogs it gives you
    
    . . .\Office\Samples\ADDRBOOK
    . . .\Office\Samples\CONTACT
    . . .\Office\Samples\INVENTRY
    . . .\Office\Samples\Northwind
    
    even if you declare the a USer DSN only to
    
    . . .\Office\Samples\Northwind
    
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    . . .\Office\Samples\Northwind.mdb
    
    in
    
    . . .\IDS\File\examples
    
    and set up a system DSN to got IDSExamples.mdb
    
    However, while query the DBMS for catalogs, I got
    
    . . .\IDS\File\examples\IDSExamples
    . . .\IDS\File\examples\Northwind
    
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    as sort of a 'schema'?
    
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- 7
  - Scroll JList to bottom automatic .
    Hi,
    
    How to automatic scroll a JList to bottom of the list, i.e when inserting
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    JList jlist = new JList(objectArray);
    JScrollPane scroll = new JList(jlist);
    
    Any simple code to do this?
    
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- 8
  - Parallel port in Java...Is it possible to read or write from the parallel port of PC with Java? And
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- 9
  - JAX-RPC: Strange Exception with Dynamic Proxy ClientHello there
    
    I am using currently SUN's Webservice Development Kit 1.4 and try to
    realise a JAX-RPC "rpc/encoded" webservice.
    
    My applicatio is currently running if I am using a static client
    (stubs geenerated by wscompile). If am going forward to use a dynamic
    proxy client, I am getting a strange exception during the
    deserialization of the xml data on the client: "trailing block
    elements must have an id attribute". see stack trace at the end of the
    messsage.
    
    As far as I understand is that it must somewthing be with the
    "ArrayList" or arrays which I am using in my JavaBean which I sent
    from the server to the client. Here my extract from my JavaBean:
    
    public class Article
    {
    long id;
    Date date;
    String category;
    String title="";
    String lead="";
    List texts;
    }
    
    If I am taking out the member "List texts" then it will work
    correctly. The list contains only Strings. I tried also to use
    String[] array, but this didn't help either.
    
    So here, my questions perhaps someone has some ideas what I did wrong.
    
    - Why does it work with the stastic cleint but not with the dynamic
    proxy?
    - Does anybody know an example on the net where in JavaBeans Lists or
    Arrays has been used?
    - Anybody an idea why this error appears? Did I something wrong?
    
    Thank you in advance
    Mark Egloff
    
    trailing block elements must have an id attribute
    at com.sun.xml.rpc.encoding.SOAPDeserializationContext.deserializeMultiRefObjects(SOAPDeserializationContext.java:81)
    at com.sun.xml.rpc.client.StreamingSender._send(StreamingSender.java:226)
    at com.sun.xml.rpc.client.dii.CallInvokerImpl.doInvoke(CallInvokerImpl.java:80)
    at com.sun.xml.rpc.client.dii.BasicCall.invoke(BasicCall.java:489)
    at com.sun.xml.rpc.client.dii.CallInvocationHandler.doCall(CallInvocationHandler.java:122)
    at com.sun.xml.rpc.client.dii.CallInvocationHandler.invoke(CallInvocationHandler.java:86)
    at $Proxy0.getArticle(Unknown Source)
    at tagesanzeiger.client.ManagerDynamicClient.main(ManagerDynamicClient.java:43)
- 10
  - Mac version of IE tires to download sounds rather than playing them.
    
    I've done a web site which encorporates javascripted sound behaviors.
    
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    to do. That is, play the sound on both "mouse over" and "mouse up"
    events.
    
    On the Macintosh version of IE it triggers off an automatic download
    attempt. I have also seen this on some PC's running Netscape, but
    rarely.
    
    Opera doesn't even seem to do anything with the sound events on the
    Mac. The PC version of Opera seems to work correctly.
    
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    some other authoring program, so it can be controlled on these
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    S.
- 11
  - best approach for transaprent boxes
    I'm hoping for some guidance on the best way to do the following, since I am fairly new to the Java language.
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- 12
  - Certificate Login ModuleHi All,
    
    If I am correct JBoss has added a SSL certificate login module in
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    a Login Module.
    
    Any pointers in this direction will be highly appreciated.
    
    Thanks in Advance,
    -DN
- 13
  - Using a JList with a cell renderer within an applet/cell renderer not workingI have a cell renderer for a JList that is supposed to render the foreground
    color in blue, and also insert tabs into the lines. When this code is
    changed to run as an application, the cell renderer performs as expected.
    When the code is run as an applet, the cell renderer has no impact at all.
    
    Any help would be appreciated.
    
    I am using SDK 1.4.0, Windows XP Professional.
    
    import javax.swing.*;
    import java.awt.event.*;
    import java.awt.*;
    import java.text.DecimalFormat;
    import javax.swing.text.MaskFormatter;
    import java.text.ParseException;
    import javax.swing.border.Border;
    import javax.swing.border.EmptyBorder;
    import java.util.StringTokenizer;
    public class TempConvert extends JApplet {
    
    public JFormattedTextField low;
    public JFormattedTextField high;
    public JFormattedTextField incr;
    
    public TempConvert() {
    getContentPane().setLayout(new BorderLayout());
    createGrid();
    setSize(270,400);
    
    }
    private void createGrid() {
    
    JPanel panel = new JPanel(new BorderLayout());
    
    // add selection panel
    MaskFormatter mf1 = null;
    MaskFormatter mf2 = null;
    try
    {
    mf1 = new MaskFormatter("####");
    mf1.setPlaceholderCharacter('_');
    //mf1.setCommitsOnValidEdit(true);
    mf2 = new MaskFormatter("###");
    mf2.setPlaceholderCharacter('_');
    //mf2.setCommitsOnValidEdit(true);
    }
    catch (ParseException e){
    }
    
    low = new JFormattedTextField(mf1);
    low.setFocusLostBehavior(JFormattedTextField.COMMIT);
    high = new JFormattedTextField(mf1);
    high.setFocusLostBehavior(JFormattedTextField.COMMIT);
    incr = new JFormattedTextField(mf2);
    incr.setFocusLostBehavior(JFormattedTextField.COMMIT);
    JPanel select = new JPanel(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.fill = GridBagConstraints.NONE;
    addgbc(select, new JLabel("Low Temperature Range . . ."),gbc,0,0);
    addgbc(select, low,gbc,1,0);
    addgbc(select, new JLabel("High Temperature Range . ."),gbc,0,1);
    addgbc(select, high,gbc,1,1);
    addgbc(select, new JLabel("Increment Degrees . . . . ."),gbc,0,2);
    addgbc(select, incr,gbc,1,2);
    panel.add(select, BorderLayout.NORTH);
    
    // add temperature list
    final JList list = new JList();
    TabListCellRenderer renderer = new TabListCellRenderer();
    //renderer.setTabs(new int[] {50,200,300,});
    list.setCellRenderer(renderer);
    JScrollPane scroller = new JScrollPane();
    scroller.getViewport().add(list);
    panel.add(scroller, BorderLayout.CENTER);
    
    // add buttons
    JPanel buttons = new JPanel(new FlowLayout(FlowLayout.CENTER,5,5));
    JButton ok = new JButton("OK");
    JButton cancel = new JButton("Cancel");
    buttons.add(ok);
    buttons.add(cancel);
    panel.add(buttons, BorderLayout.SOUTH);
    getContentPane().add(panel);
    //pack();
    setVisible(true);
    
    // register action listeners for the buttons
    ok.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
    if (verifyData())
    {
    list.setListData(calculateTemps());
    list.revalidate();
    list.repaint();
    }
    }
    
    });
    cancel.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
    // stop();
    // destroy();
    }
    
    });
    
    }
    
    private int getIntValue(JFormattedTextField field)
    {
    try
    {
    return Integer.parseInt(field.getText().toString().replace('_','
    ').trim());
    }
    catch (NumberFormatException e){}
    
    return 0;
    }
    
    private boolean verifyData()
    {
    int lowTemp = getIntValue(low);
    int highTemp = getIntValue(high);
    int incrTemp = getIntValue(incr);
    
    if (lowTemp < 0)
    {
    JOptionPane.showMessageDialog(this, "If low temperature is entered, must
    be greater than zero");
    return false;
    }
    
    if (highTemp == 0)
    {
    JOptionPane.showMessageDialog(this, "High temperature must be entered");
    return false;
    }
    
    if (highTemp <= lowTemp)
    {
    JOptionPane.showMessageDialog(this, "High temperature must be greater
    than low temperature");
    return false;
    }
    
    if (incrTemp == 0)
    {
    JOptionPane.showMessageDialog(this, "Increment degrees must be
    entered.");
    return false;
    }
    
    return true;
    
    }
    
    private void addgbc(Container cont, JComponent comp, GridBagConstraints
    gbc, int x, int y) {
    gbc.gridx=x; gbc.gridy=y;
    cont.add(comp,gbc);
    }
    
    private TempData[] calculateTemps() {
    
    int lowTemp = getIntValue(low);
    int highTemp = getIntValue(high);
    int incrTemp = getIntValue(incr);
    
    int range = highTemp-lowTemp;
    TempData[] tempdata = new TempData[range/incrTemp +1];
    
    int j=0;
    for (int i=lowTemp; i<=highTemp; i+=incrTemp) {
    tempdata[j] = new TempData(i);
    j++;
    }
    return tempdata;
    
    }
    public static void main (String[] args) {
    new TempConvert();
    }
    public class TempData {
    int fahrenheit;
    int celsius;
    
    public TempData(int fahrenheit) {
    this.fahrenheit = fahrenheit;
    calculateTemp();
    }
    
    private void calculateTemp() {
    
    double temp = 5/9 * (fahrenheit-32);
    celsius = (int)temp;
    
    }
    
    public String toString() {
    
    return fahrenheit + "\t" + celsius;
    }
    }
    
    }
    class TabListCellRenderer
    extends JLabel
    implements ListCellRenderer {
    
    protected static Border m_noFocusBorder;
    protected FontMetrics m_fm = null;
    protected Insets m_insets = new Insets(0, 0, 0, 0);
    
    protected int m_defaultTab = 50;
    protected int[] m_tabs = null;
    
    public TabListCellRenderer() {
    m_noFocusBorder = new EmptyBorder(1, 1, 1, 1);
    setOpaque(true);
    setBorder(m_noFocusBorder);
    }
    
    public Component getListCellRendererComponent(JList list,
    Object value, int index, boolean isSelected, boolean cellHasFocus) {
    setText(value.toString());
    System.out.println("getText = " + getText());
    setBackground(isSelected ? list.getSelectionBackground() :
    list.getBackground());
    //setForeground(isSelected ? list.getSelectionForeground() :
    list.getForeground());
    setForeground(Color.blue);
    //setBackground(Color.blue);
    setFont(list.getFont());
    setBorder((cellHasFocus) ?
    UIManager.getBorder("List.focusCellHighlightBorder") : m_noFocusBorder);
    
    return this;
    }
    
    public void setDefaultTab(int defaultTab) {
    m_defaultTab = defaultTab;
    }
    
    public int getDefaultTab() {
    return m_defaultTab;
    }
    
    public void setTabs(int[] tabs) {
    m_tabs = tabs;
    }
    
    public int[] getTabs() {
    return m_tabs;
    }
    
    public int getTab(int index) {
    if (m_tabs == null)
    return m_defaultTab*index;
    
    int len = m_tabs.length;
    if (index>=0 && index<len)
    return m_tabs[index];
    
    return m_tabs[len-1] + m_defaultTab*(index-len+1);
    }
    
    public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Color colorRetainer = g.getColor();
    m_fm = g.getFontMetrics();
    
    g.setColor(getBackground());
    g.fillRect(0, 0, getWidth(), getHeight());
    getBorder().paintBorder(this, g, 0, 0, getWidth(), getHeight());
    
    g.setColor(getForeground());
    g.setFont(getFont());
    m_insets = getInsets();
    int x = m_insets.left;
    int y = m_insets.top + m_fm.getAscent();
    
    StringTokenizer st = new StringTokenizer(getText(), "\t");
    while (st.hasMoreTokens()) {
    String sNext = st.nextToken();
    System.out.println("next token = " + sNext);
    g.drawString(sNext, x, y);
    x += m_fm.stringWidth(sNext);
    
    if (!st.hasMoreTokens())
    break;
    int index = 0;
    while (x >= getTab(index))
    index++;
    x = getTab(index);
    }
    
    g.setColor(colorRetainer);
    }
    
    }
- 14
  - JNDI Authenticate UserHi All,
    
    I have the below code which is supposed to return a true if the user is
    authenticated against active directory and false if the user is not.
    
    This works fine if you send it a correct username and correct password. It
    also works if you send it a correct username with an incorrect password. It
    also works if you send it an in-correct username with a password.
    
    My problem is that a few accounts in the directory don't have passwords set.
    I.e. password is blank. If I send any username without a password then it
    always returns true, even if that user has a password set or the user
    doesn't exist. Does anyone have any ideas why this is?
    
    <code>
    public boolean authenticateUser(String userName, String password){
    //Try to log in with the supplied username and password
    //If it fails then either the user doesn't exist or the wrong
    crudentials where supplied
    
    try{
    Hashtable env = new Hashtable();
    env.put(Context.INITIAL_CONTEXT_FACTORY,
    "com.sun.jndi.ldap.LdapCtxFactory");
    env.put(Context.PROVIDER_URL, ldapConnectionString);
    
    env.put(Context.SECURITY_AUTHENTICATION, "simple");
    env.put(Context.SECURITY_PRINCIPAL, userName + "@" +
    ADName);
    env.put(Context.SECURITY_CREDENTIALS, password);
    
    DirContext ctx = new InitialDirContext(env);
    
    return true;
    }catch(Exception ex){
    //Authentication failed
    return false;
    }
    }
    </code>
- 15
  - Something FunHere's something fun that you may find interesting. I don't really have
    enough know-how to do anything with it yet, but some of you might.
    
    http://mtg.upf.edu/reactable/
    
    One of the releases is in Java. Here's a video of it finished.
    
    http://youtube.com/watch?v=0h-RhyopUmc
    
    If anyone does anything with this, let me know!