java-programmer >>How to move data from a CSV file to a JTable, and from a JTable to a CSV file ?

How to move data from a CSV file to a JTable, and from a JTable to a CSV file ?

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- 1
  - hai dearhai friends,
    
    "each day is a new adventure to dream search and discover"
    
    www.goodhistory5.blogspot.com
- 3
  - my first bean (tomcat)Hello,
    I'm getting more and more confused looking at old threads (and some are
    very old) so I'll take the liberty of a new post for a very basic
    question.
    
    Why am I having a problem accessing my java class/bean from a jsp page
    (which itself is running ok)? I'm running Tomcat 5 so I believe I need
    a "myapp.xml" file in conf\catalina\localhost\ containing a context
    element whose purpose is to associate an http call with the path of the
    home directory where the class can be found (in \classes or in a jar in
    \lib).
    
    Then, in theory, 'jsp:usebean..etc.' will find the class I want.
    Instead I get a stack trace including lines like this...
    
    org.apache.jasper.JasperException: /jsp/listProgrammes.jsp(5,0)
    org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
    org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:409)
    org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:150)
    org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1227)
    org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1116)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
    
    (the top line is my jsp page which is trying to get hold of the bean)
    
    Can anyone spell out the principles for me while I go away and check
    for typos again? (Yes I have read some principles as explained in the
    Tomcat docs but, well, it doesn't help for the moment.)
    
    Many thanks
    Ian
- 4
  - Tomcat + Eclipse setupI have a brief question about my Tomcat config. I try to place the
    webapps folder structure inside my Eclipse project strutcure, but
    outside the Tomcat home directory. Example:
    
    c:\Eclipse\MyProject
    c:\Java\Tomcat\webapps
    
    In order to do so I set in the server XML:
    
    <Host name="localhost" debug="0"
    appBase="c:\Eclipse\MyProject" unpackWARs="true" autoDeploy="true"
    xmlValidation="false" xmlNamespaceAware="false">
    
    mywebapp.xml:
    <Context path="/mywebapp" docBase="c:\Eclipse\MyProject\mywebapp">
    
    Question: I would expect mywebapp.war to be automatically unpacked
    when I place it in c:\Eclipse\MyProject (it's the appbase). That's the
    way it works when I leave the webapp dir unchanged (inside tomcat
    home). However, it does not work when I set the dir outside the tomcat
    home dir.
    
    Any hints would be appreciated.
    Regards HW
    
    PS: Tomcat 5.0.25 on Win2k
- 4
  - RMI vs. Sockets vs. ?Hi,
    
    In my graduate class we have to implement a distributed application
    using Sockets and then again using Remote Method Invocation (RMI). Is
    one more prevalent than the other in the "real world"? Or is there
    something else that is used?
    
    Just curious for my own knowledge and satisfaciton.
    
    Thanks.
- 4
  - Why braces around try/catch?In article <3f3393b6$0$150$email***@***.com>,
    Jos A. Horsmeier <email***@***.com> wrote:
    >
    >I beg to differ; catch clauses are optional as in --
    >
    > try {
    > // some statements making
    > // up the statement block
    > }
    > // no catch
    
    I'm not sure what you mean. If I compile the above I will get a
    compile error along the lines of
    'try' without 'catch' or 'finally'
    
    Cheers
    Bent D
    --
    Bent Dalager - email***@***.com - http://www.pvv.org/~bcd
    powered by emacs
- 4
  - Help me please! class problemsHi look @ this code:
    
    mapper.java:
    -------------
    
    import java.applet.*;
    import java.awt.*;
    
    public class mapper extends Applet
    {
    public void paint (Graphics g)
    {
    
    if(bild.isLoadedID(id))
    {
    bild.showImage(id,0,0,400,400,g);
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    {
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    }
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    }
    
    OrgImage.java:
    ----------------
    
    import java.awt.Graphics;
    import java.awt.Image;
    import java.awt.MediaTracker;
    
    public class OrgImage
    {
    int MAX=10;
    MediaTracker tracker;
    Image test;
    
    OrgImage()
    {
    this.image = new Image[MAX];
    this.tracker = new MediaTracker(this); //ERROR1
    }
    
    int addImage(String source)
    {
    this.ID++;
    this.test = this.getImage(getCodeBase(), source); //ERROR2
    return this.ID;
    }
    
    }
    
    Both files are in one directory im working with Eclipse 3.0
    
    ERROR1: The constructor MediaTracker(OrgImage) is undefined
    ERROR2: The method getCodeBase() is undefined for the type OrgImage
    
    Please help
    
    MfG
    Stylistics
- 5
  - Java HotSpot ArticleJames Gosling linked to this article from his blog.
    (http://blogs.sun.com/jag/) I thought it might be of interest to those
    involved in recent discussions about Java performance.
    
    http://weblogs.java.net/blog/kohsuke/archive/2008/03/deep_dive_into.html
    
    Apparently if you want to try it out you'll need a debug version of the JDK.
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  - Constraints in JPA (using Hibernate)Hi,
    
    I have some @Entitys in JPA with Hibernate which create the following
    relationship:
    
    Brand 1<->* User
    User 1<->* CreditCard
    
    (where 1<->* means a bidirectional one-many relationship)
    
    I want to be able to put a constraint on the CreditCard entity such
    that the field CreditCard.CreditCardNumber is unique for a particular
    Brand.
    
    Without adding a reference to Brand in the CreditCard entity, is there
    a way that I can achieve this?
    
    Thanks in advance for any pointers!
    
    Rich
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  - profile jdk 1.3.1 from antHi,
    
    We are intrested in profiling ( measure/find bottlenecks) in our java
    application. I need advice where I can find a simple and free
    profiling/performance tool for jdk1.3.1 that can be executed from ant (
    or tool has a java api).
    
    cheers,
    
    //mikael
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    one doesn't remember to which class it belongs?
    Thaks
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  - Derived class & objects to parent constructorI've worked around this problem but it's still bugging me a bit so I
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    methods to later retrieve it. I couldn't find a syntax that would compile.
    I'm thinking it's not possible but just wanted to confirm that I wasn't
    missing something.
    
    class someobject {}
    
    class parent {
    public parent (someobject so) { }
    }
    
    class child extends parent {
    // someobject so = new someobject(); // Doesn't work
    public child () {
    // someobject so = new someobject(); // Also doesn't work
    super (new someobject ()); // Want to hold a reference
    // to someobject in child
    }
    }
    
    Thanks in advance for any answers.
    
    Doug
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  - Portal Solutions for developersHello everyone,
    
    For easy to use web clipping and application clipping tools and portal
    development follow the link below:
    
    http://clickmarks.com/solutions/portlet_solutions/portlet_factory.html
    
    Cheers.
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  - Difference between Abstract class and interfaceHi,
    Can you let me know the difference between Abstract class and
    interface. I did research on the topic and found it helpful. Well, the
    refined question I have is
    1. Is there any difference between abstract class for which all the
    methods are declared abstract and then an interface. I know that with
    interface, multiple inhertiance can be achieved.
    Can you please tell me in object tree/method invocation view.
    
    thanks in advance
- 16
  - JTable in Applet, dynamic updateI have a JTable, within a JScrollPane, in an Applet. The table uses the
    DefaultTableModel to manage the data. This table gets updated data in the
    form of a Vector of Vectors every so often from the server. To update the
    table I use the setModel method. Problem is... table doesn't update. The
    only way I can get it to work is minimise the applet (using appletviewer)
    and then expand it again. Having done that the table shows the updated data.
    Any idea what I need to do to force the table to repaint itself when the new
    data vector is loaded into the DefaultTableModel?
    
    Any help / pointers most welcome.
    
    Below is the inner class doing the work.
    
    data is the new vector of vectors, model is the table model and tasks is the
    table.
    
    private class TableFiller implements Runnable
    {
    private Vector v;
    
    public TableFiller(Vector data)
    {
    v = data;
    }
    public void run()
    {
    model.setDataVector(v, columnNames);
    TableColumn column = tasks.getColumnModel().getColumn(0);
    column.setPreferredWidth(150);
    }
    }
- 16
  - JNDI/LDAP and PagedResultsControlI've encountered something that has stumped me for the past 2 days.
    Perhaps someone on this list has seen this before or can explain why
    this might be happening. I'm trying to use the SortControl and
    PagedResultsControl classes that are part of the JNDI/LDAP Booster
    Pack. In the code below, you can see that I create the 2 Control
    object, stick them in an array, and set them as "request controls" for
    the LdapContext. Thankfully, both the search and the sort controls do
    the right thing - the items come out sorted with a page size of 10.
    
    My issue is trying to get the "response controls" associated with
    invoking the search() method on the LdapContext. According to the
    JNDI JavaDocs, the getResponseControls() method "Retrieves the
    response controls produced as a result of the last method invoked on
    this context" (which in my case is the search() method). If I execute
    a getResponseControls() call on the LdapContext immediately after the
    search(), it returns null. However, after MUCH agonizing I figured
    out that if I walk over the enumeration of results returned from the
    search() method and do a getResponseControls() afterward, the proper
    Control object array is returned (one for the SortControl and one for
    the PagedResultsControl). I noticed that this was the common element
    in code snippets I found on the Web that worked.
    
    Can someone please explain to me why I have to walk through this
    enumeration? I also verified that you have to walk over the entire
    enumeration, not just an element or 2. Specifically, the hasMore()
    method has to be called to get this to work. If I create a for loop
    and walk through my page set (say 10 elements) and then try to get the
    response controls, they're still null. It only works when hasMore()
    returns false. This is really driving me bonkers?
    Thank you in advance for anyone who can help me here!
    
    String sortBy = "sn";
    int pageSize = 10;
    byte[] cookie = null;
    int total;
    
    Control[] requestControls = new Control[]
    {
    new SortControl(new String[]{sortBy}, Control.CRITICAL),
    new PagedResultsControl(pageSize)
    };
    
    LdapContext ldapContext = new InitialLdapContext(environment, null);
    ldapContext.setRequestControls(requestControls);
    
    NamingEnumeration results = ldapContext.search(contextName,
    searchFilter, searchControls);
    
    //IF I DON'T WALK OVER THIS ENUMERATION, THE RESPONSE CONTROLS OBJECT
    IS NULL
    while(results != null && results.hasMore())
    {
    SearchResult entry = (SearchResult) results.next();
    }
    
    Control[] responseControls = ldapContext.getResponseControls();
    if(responseControls != null)
    {
    for(int i = 0; i < responseControls.length; i++)
    {
    if(responseControls[i] instanceof PagedResultsResponseControl)
    {
    PagedResultsResponseControl p = (PagedResultsResponseControl)
    responseControls[i];
    cookie = p.getCookie();
    total = p.getResultSize();
    }
    }
    }
    else
    {
    System.out.println("response controls is null");
    }
    
    ldapContext.close();

Author

Message

Tintin92

Posted: 2007-2-15 2:31:00

Top

java-programmer, How to move data from a CSV file to a JTable, and from a JTable to a CSV file ? Hello,

How to move data from a CSV file to a JTable, and from a JTable to a CSV
file ?

Thanks,

Tintin92

Andrew Thompson

Posted: 2007-2-15 2:51:00

Top

java-programmer >> How to move data from a CSV file to a JTable, and from a JTable to a CSV file ? On Feb 15, 5:30 am, "Tintin92" <email***@***.com> wrote:
...
> How to move data from a CSV

Parse the data into a...(1)

>..file

e.g. FileInputStream

>.. to a JTable,

(1) data structure such as an Objet[][]
TableModel or Vector and hand it to
the constructor.

>..and from a JTable to a CSV
> file ?

Do the above in reverse.

> Thanks,

No worries.

Andrew T.

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    int)
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    void com.ibm.edms.od.ODServer.initialize(java.lang.String,
    java.lang.String)
    
    does not really help and I found when trying to catch this and dump
    the name of the library was "null".
    
    I somehow can't believe I'm the first one to struggle with this.
    Any help is greatly appreciated.
    
    Thanks,
    Martin
- 12
  - Castor XML Question: How to ignore wrapping elementsI have an xml file that looks something like:
    
    <Response>
    <Invoice>
    <PrimaryKey>239</PrimaryKey>
    <OrderTotal>5893.03</OrderTotal>
    </Invoice
    </Response>
    
    I am trying to map <Invoice> to my Invoice.java class. How do you get
    Castor to ignore the outer <Response> tag? I could always do
    pre-processing, but I would like to know if it's possible to do this
    in the mapping xml file.
    
    Thanks,
    Ankur
- 13
  - jikes dependenciesHi,
    I try to find all the dependencies of a class file (which are the
    class to recompile when I modify just one java file).
    According to Jikes website, "C depends on D if and only if the
    constant pool for C contains a reference to D".
    So, for a particular class, E, I found with Jikes the following
    dependencies :
    A, B, C, D.
    At the same time, I used the BCEL library from apache to have a look
    at the constant pool and I just find references to the class A, B and
    C.
    The class C is a parameter of one method of my class E and the class C
    implements the interface D.
    I understand why the class E depends on the class D.
    Is the Jikes assertion incomplete or should I understand "C depends on
    D (and all its ancestor/interfaces) if and only if the constant pool
    for C contains a reference to D" or maybe even "C depends on D (and
    all its dependencies) if and only if the constant pool for C contains
    a reference to D"??
    Thanks for your help.
    Eric Deshayes
- 14
  - [ANN] Scala 2.5.0-RC2 releasedWe are pleased to announce version 2.5.0-RC2 of the Scala distribution:
    
    | Scala smoothly integrates features of object-oriented and |
    | functional languages and is fully interoperable with Java |
    
    It fixes several bugs found in RC1.
    
    http://www.scala-lang.org/downloads/changes.html#v2.5.0-RC2
    
    Other release candidates may follow this version depending
    on bugs reported by the Scala community (no changes/additions,
    only bug fixes!); the final release (aka. 2.5.0-final) is
    planned in 1-2 weeks.
    
    Bye
    -- Stephane
- 15
  - struts action quiestionHello,
    
    I have a short question concerning struts action context stack. I have 3
    views. View A, B and C
    To view C, I can get from view A, or B. In view C I have button "BACK",
    Whenever I click BACK button, I want to go back to page that called view C
    (A od B).
    Is there any way to do it (remember calling view), or I have to implement my
    own context stack mechanizm ?
    
    thank you,
    
    fera