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Applet中共享basecode

kooyee — Sat, 15 Mar 2008 11:41:00 GMT

applet中得到basecode
当这个��D��被其他form使用�Ӟ��可以保存在ThreadLocal或者其他Cache�?br />

private static ThreadLocal codeBase = new ThreadLocal();

codeBase.set(this.getCodeBase());

public static Object getUrl(){
return codeBase.get();
}

在其他的form中，可以用getUrl�q�个static method调用得到main frame的codebase

URL codeBase = (URL)MainFrame.getUrl();

kooyee 2008-03-15 19:41 发表评论

在Applet中读取，写入文�g内容

kooyee — Fri, 14 Mar 2008 16:51:00 GMT

---- 我们知道�Q�在Java Applet中出于安全性考虑�Q�Applet是不允许�Ҏ��件进行操作的�Q�不仅不允许写文�Ӟ��而且不允许读文�g。尽��我们在�~�制Applet时即使��用了文�g操作的语句Java不会报错�Q�在开发工��P��如Cafe�Q�中调试时也能够正常�q�行�Q�但当我们在��览器中�q�行�q�个Applet时浏览器��׃��报错。但有时我们的确要读取文件中的内容，比如要将服务�?/a>中的.txt文�g内容在Applet中显�C�出来，是不是就没有办法了呢�Q?

---- 不！有办法。决�H�就是我们不要将�q�些服务器上的文件作为普通文件来处理�Q�而是��它们作为网�l�资源来获取它们的内宏V��在Java中可用于获取�|�络资源的类主要有两�U�，一是URL�c�，另一个是URLConnection�c�R��两个类都提供了以字节流的方式读取资源信息的�Ҏ��Q�而且可以对资源信息的�c�d��作出判断�Q�以便作相应的处理。不同之处是URLConnection�c�d��提供的信息比URL�c�要多得多，它除了可以获取资源数据外�Q�还可以提供资源长度、资源发送时间、资源最新更新时间、资源编码、资源的标题�{�许多信息�?

---- 以下是两个类的常用方法�?

URL�c�：

· URL(String, String, int, String)

构造方法，创徏一个包含协议类型、主机名�?br />

端口号和路径的URL对象

· URL(String, String, String)

构造方法，创徏一个包含协议类型、主机名和�\�?br />

的URL对象�Q�其中端口号为缺省�?br />

· URL(String)

构造方法，创徏一个URL对象�Q�参数将协议

、主机名、端口号和�\径组合�v�?br />

· URL(URL,String)

构造方法，�Ҏ��l�定URL对象与相对�\径创��Z��个新的URL对象

· Object getContent( )

��索URL内容信息�Q��ƈ�q�回�l�对�?br />

· InputStream openStream( )

从资源处�q�回一个输入流

· URLConnection openConnection( )

生成一个URLConnection对象

URLConnection�c�：

· protected URLConnection(URL)

构造方法，创徏一个针�Ҏ��定URL对象的URLConnection�c?br />

· Object getContent( )

�q�回URL对象所对应的内�?br />

· InputStream getInputStream( )

获取从对象中��d��的字节流

· Protected static String guessContentTypeFromStream(InputStream is)

�Ҏ��输入��猜��内容的�c�d��

---- 下面以读取服务器上的.txt文�g内容��Z��说明如何在Applet中读取文件。设服务器的IP地址�?02.114.1.16�Q?txt文�g的�\径�ؓ/file/sample.txt。以下是��d��sample.txt内容的Applet的源代码�?

//getfile.html

< HTML >
< HEAD >
< TITLE >��d��文�g的Applet< /TITLE >
< /HEAD >
< BODY >

�q�是服务器上TXT文�g的内�?/span>< BR >

< Applet code="getFile.class" width=200 height=100 >

< /Applet >
< /BODY >

< /HTML >

//getFile.java

import java.awt.*;
import java.applet.*;
import java.net.*;
import java.io.*;

public class getFile extends Applet
{
String info;

public void init()
{
URL url;
URLConnection urlc;

resize(200,100);
setBackground(Color.white);

try{

url = new URL("http://202.114.1.16/file/sample.txt");
urlc = url.openConnection();
urlc.connect();

info = getInfo(urlc);
}catch(MalformedURLException mfe){
System.out.println("URL form error!");
}catch(IOException ioe){
System.out.println("IO Exception!");
}
}

public void paint(Graphics g)
{
g.setColor(Color.red);
g.drawString(info,50,50);
}

public String getInfo(URLConnection urlc)
{
String txt = new String();
InputStream is;
int i;

try{
is = urlc.getInputStream();
i = is.read();
while(i != -1){
txt = txt + (char)i;
i = is.read();
}

is.close();

}catch(IOException ioe){
System.out.println("IO Exception!");
txt = new String("File read failed!");
}

return txt;
}
}

以上JAVA�E�序在两�U�系�l�中调试均通过�Q�两�U�系�l�的配置分别为：

�Q?�Q?服务器：Digital Unix + Oracle Webserver3.0

��览器：Netscape4.0.5或IE4.0

�Q?�Q?服务器：Windows98 + Pws

��览器：Netscape4.0.5或IE4.0

用bufferedreader的方�?br />

//create url to the file on server
            URL url = new URL(ma.getCodeBase(),"filename");
            URLConnection urlc = url.openConnection();

            BufferedReader in = new BufferedReader(new InputStreamReader(urlc.getInputStream()));
            String line=null;
            if( (line = in.readLine()) != null )
            {
                System.out.printv(line);
            }
            in.close();

写入

//create url to the file on server
URL url = new URL(config.getCodeBase(),"servlet/jsp name");
URLConnection urlc = url.openConnection();

            urlc.setDoOutput(true);

        PrintStream stream = new PrintStream( urlc.getOutputStream() );
        stream.println("param name="+"something write to file");

            BufferedReader in = new BufferedReader( new InputStreamReader( urlc.getInputStream()));注意�q�里要接收jsp�Q�servlet的response�Q?否则它不�q�行

在服务器端用servlet�Q�jsp得到request�Q�然后对其进行处理（save to a file or其他�Q?注意�q�里要接收jsp�Q�servlet的response�Q?否则它不�q�行

// �Ҏ��旉��得文件名
Calendar calendar = Calendar.getInstance();
String fileame = String.valueOf(calendar.getTimeInMillis()) +".html";
fileame = request.getRealPath("/")+fileame;//生成的html文�g保存路径
FileOutputStream fileoutputstream = new FileOutputStream(fileame);//建立文�g输出��?/span>
byte tag_bytes[] = templateContent.getBytes();
fileoutputstream.write(tag_bytes);
fileoutputstream.close();

kooyee 2008-03-15 00:51 发表评论

【JTabbedPane】tab change事�g

kooyee — Fri, 07 Mar 2008 16:50:00 GMT

tab change 事�g�Q?使用到StateChanged Event

import java.awt.*;
import java.awt.event.*;
import java.util.StringTokenizer;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.text.JTextComponent;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreePath;

public class SelectableTree extends JFrame
implements TreeSelectionListener,ChangeListener
{

   protected Component makeJTreePanel(JTree tree)
   {
      JPanel panel = new JPanel(false);
      panel.setLayout(new GridLayout(1, 1));
      panel.add(new JScrollPane(tree));
      return panel;
   }

   protected JTree makeJTree(String text)
   {
      DefaultMutableTreeNode root
               = new DefaultMutableTreeNode(text);
      for(int i = 0; i < 4; i++)
      {
         DefaultMutableTreeNode child
               = new DefaultMutableTreeNode(text + i);
         for(int j = 0; j < 4; j++)
            child.add(new DefaultMutableTreeNode(text + i + j));
         root.add(child);
      }

      JTree tree = new JTree(root);
      tree.addTreeSelectionListener(this);
      return tree;
   }

   public void valueChanged(TreeSelectionEvent event)
   {
      String temp = event.getPath().toString();
      for(StringTokenizer token = new StringTokenizer(temp, ","); token.hasMoreTokens();)
         temp = token.nextToken();
      textArea.setText("Current Selection: " + temp.substring(0, temp.length() - 1));
   }

   /**Sole method of ChangeListener*/
   public void stateChanged(ChangeEvent e)
   {
        DefaultSingleSelectionModel dSM
                = (DefaultSingleSelectionModel)e.getSource();
      int index = dSM.getSelectedIndex();
        String tabName = tabbedPane.getTitleAt(index);
        /** I imagine you will do more than this*/
        if(textArea != null)
            textArea.setText("Tab Selected: " + tabName);

   }
   /****************************************/

   public SelectableTree()
   {
      super("ECHO Service Demo");
      //WindowUtilities.setNativeLookAndFeel();
      //addWindowListener(new ExitListener());
      setDefaultCloseOperation(EXIT_ON_CLOSE);
      Container content = getContentPane();
      tabbedPane = new JTabbedPane();

      /**add ChangeListener to Model*/
      tabbedPane.getModel().addChangeListener(this);
      /*******************************************/

      Component panel1 = makeJTreePanel(makeJTree("Taxonomy1"));
      tabbedPane.addTab("Taxonomy1", null, panel1, null);
      tabbedPane.setSelectedIndex(0);
      Component panel2 = makeJTreePanel(makeJTree("Taxonomy2"));
      tabbedPane.addTab("Taxonomy2", null, panel2, null);
      Component panel3 = makeJTreePanel(makeJTree("Taxonomy3"));
      tabbedPane.addTab("Taxonomy3", null, panel3, null);
      Component panel4 = makeJTreePanel(makeJTree("Taxonomy4"));
      tabbedPane.addTab("Taxonomy4", null, panel4, null);
      content.add(tabbedPane, "Center");
      textArea = new JTextArea("Services of Current Category: NONE");
      content.add(textArea, "South");
      setSize(350, 375);
      setVisible(true);
      }

      public static void main(String args[])
      {
         new SelectableTree().setVisible(true);
      }

private JTabbedPane tabbedPane;
private JTextArea textArea;
}

kooyee 2008-03-08 00:50 发表评论

【ComboBox】改变选择时ItemStateChanged 触发两次

kooyee — Fri, 07 Mar 2008 15:53:00 GMT

Swing中ComboBox改变选择时ItemStateChanged 触发两次。一�ơ时旧的选项deselect时触发，另一个是在新的选项select时触发�?br />
要�ɘq�个事�g只发生一�ơ，可以�q�样�Q?br />

public void itemStateChanged(ItemEvent ie){
if(ie.getStateChanged() == ItemEvent.SELECTED){
// here do whatever you were going to do when the item was selected
}
}

kooyee 2008-03-07 23:53 发表评论

[Table] Swing Table 中��?button

kooyee — Sat, 01 Mar 2008 16:16:00 GMT

使用到自定义�?font size="2">CellRenderer�?CellEditor. 它们以作为inner class加入到table所在的class�?br />
定义一个cell的Jbutton渲染对象

class ButtonRenderer extends JButton implements TableCellRenderer {

          public ButtonRenderer() {
            setOpaque(true);
          }

          public Component getTableCellRendererComponent(JTable table, Object value,
              boolean isSelected, boolean hasFocus, int row, int column) {
            if (isSelected) {
              setForeground(table.getSelectionForeground());
              setBackground(table.getSelectionBackground());
            } else {
              setForeground(table.getForeground());
              setBackground(UIManager.getColor("Button.background"));
            }
            setText((value == null) ? "" : value.toString());
            return this;
          }
        }

定义button cell editor

class ButtonEditor extends DefaultCellEditor {
          protected JButton button;

          private String label;

          private boolean isPushed;

          private String selectId;

          public ButtonEditor(JCheckBox checkBox) {
            super(checkBox);
            button = new JButton();
            button.setOpaque(true);
            button.addActionListener(new ActionListener() {
              public void actionPerformed(ActionEvent e) {
                fireEditingStopped();
              }
            });
          }

          public Component getTableCellEditorComponent(JTable table, Object value,
              boolean isSelected, int row, int column) {
            if (isSelected) {
              button.setForeground(table.getSelectionForeground());
              button.setBackground(table.getSelectionBackground());
            } else {
              button.setForeground(table.getForeground());
              button.setBackground(table.getBackground());
            }

            label = (value == null) ? "" : value.toString();
            button.setText(label);
//get the value of the first cell in this selected row
            selectId = table.getValueAt(row, 0).toString();
            isPushed = true;
            return button;
          }

         //�q�里是点击button执行的操�?/span>
                public Object getCellEditorValue() {
            if (isPushed) {

                                JOptionPane.showMessageDialog(null, "The first of this row is"+selectId, "", JOptionPane.ERROR_MESSAGE);
            }
            isPushed = false;
            return new String(label);
          }

          public boolean stopCellEditing() {
            isPushed = false;
            return super.stopCellEditing();
          }

          protected void fireEditingStopped() {
            super.fireEditingStopped();
          }
        }

最后在table中加入他�? 假设��d��到table中名为＂button�Q�的�?br />

table.getColumn("Button").setCellRenderer(new ButtonRenderer());

table.getColumn("Button").setCellEditor( new ButtonEditor(new JCheckBox()));

kooyee 2008-03-02 00:16 发表评论

kooyee — Sat, 01 Mar 2008 11:52:00 GMT

button setEnable(false) 后， button昄��为灰�Ԍ��但是�q�是能够触发点击�{�事件�?解决�Ҏ��可以在事件执行的操作中加入验�?br />

//if enable than do some operation
//if disable do nothing
if(this.jButton.isEnabled()){
//if ture to do these
}//false do nothing

kooyee 2008-03-01 19:52 发表评论

[Text] 改变文字事�g

kooyee — Sat, 01 Mar 2008 11:44:00 GMT

`void`	`caretPositionChanged(InputMethodEvent event)` This method is called when the cursor position within the text is changed.
`void`	`inputMethodTextChanged(InputMethodEvent event)` This method is called when the text is changed.

inputMethodTextChanged 事�g在文字改变后触发

The text field fires three events: a key-pressed event, a key-typed event, and a key-released event.
Note :
the key-typed event doesn't have key code information. 含有key charactere信息
key-pressed and key-released events don't have key character information. 含有key code信息

用来��验text changed可以用key-released events. 因�ؓ它能够通过getText�Q�）得到textfield中改变后的text. �?nbsp;key-pressed event, key-typed event 得到的是改变前的文字

kooyee 2008-03-01 19:44 发表评论

kooyee — Sat, 01 Mar 2008 11:25:00 GMT

1.
mouse clicked�?mouse pressed 的区�?br />
前者是在同一个位�|�press和release才触发事�Ӟ��执行操作. 如果在用户一个位�|�按下鼠标后改变了主意，则移动到另一个位�|�（按钮外面�Q�放开��׃��取消操作�Q�不执行操作�Q?

而后者只是触发press事�g, 也就是说按下鼠标��执行操�?br />

2.

The text field fires three events: a key-pressed event, a key-typed event, and a key-released event.
Note :
the key-typed event doesn't have key code information.
key-pressed and key-released events don't have key character information.

用来��验text changed可以用key-released events. 因�ؓ它能够通过getText�Q�）得到textfield中改变后的text. �?nbsp;key-pressed event, key-typed event 得到的是改变前的文字

Press and release the Shift key.
The text field fires two events: a key-pressed and a key-released. The text field doesn't fire a key-typed event because Shift, by itself, doesn't correspond to any character.

Type an uppercase 'A' by pressing the Shift and A keys.
You'll see the following events, although perhaps not in this order: key-pressed (Shift), key-pressed (A), key typed ('A'), key-released (A), key-released (Shift). Note that Shift is listed as the modifier key for the key-typed and key-pressed events.

Type an uppercase 'A' by pressing and releasing the Caps Lock key, and then pressing the A key.
You should see the following events: key-pressed (Caps Lock), key-pressed (A), key typed ('A'), key-released (A). Note that Caps Lock is not listed as a modifier key.

Press the Tab key. No Tab key-pressed or key-released events are received by the key event listener. This is because the focus subsystem consumes focus traversal keys, such as Tab and Shift Tab. Press Tab twice more to return the focus to the text area.

Press a function key, such as F3. You'll see that the function key is an action key.

Press the left Shift key, followed by the right Shift key. The key-pressed and key-released events indicate which Shift key was typed.

Press the Num Lock key if your keyboard has a number pad. As for Caps Lock, there is a key-pressed event, but no key-released event.

Press the '2' key on the number pad. You see the key-pressed, key-typed, and key-released events for the number '2'.

Press the '2' key on the standard keyboard. Again, you see the three event messages. The key-typed events for both number 2 keys are identical same as press in number pad. But the key-pressed and key-released events indicate different key codes and different key locations.

Press the Num Lock key again. A key-released event is fired.

kooyee 2008-03-01 19:25 发表评论

Swing 鼠标双击事�g

kooyee — Fri, 29 Feb 2008 14:31:00 GMT

鼠标双击事�g

public void mouseClicked(MouseEvent e) {
    if (e.getClickCount() == 2) {
        // handle event
    }
}

kooyee 2008-02-29 22:31 发表评论

[Swing] Table 操作

kooyee — Fri, 29 Feb 2008 13:07:00 GMT

关于table的��用方法可以参考sun的官方网站：

http://java.sun.com/docs/books/tutorial/uiswing/components/table.html

�q�里补充的主要是model的��用，去自定义table的format�?br />
在DefaultTableModel 基础上改�q�model�?在定义new DefaultTableModel时修改override它的内部method

部分代码�Q?br />

String[] columnNames = {"ID", "Date", "Value", "Qty", "Total"}
            Vector columnNamesV = new Vector(Arrays.asList(columnNames));
            Vector rowData = new Vector();

table.setModel(new javax.swing.table.DefaultTableModel(rowData,
     columnNamesV) {

//通过�q�个method使table能够�Ҏ��cell的object�c�d��来决定显�C�格式，例如boolean以checkbox格式昄��Q�而不是true/false的文字�?/span>
    public Class getColumnClass(int c) {
              Vector col = (Vector)getDataVector().get(0);
     return col.get(c).getClass();
          }

//使全部cell��Z��能编�?/span>
    public boolean isCellEditable(int rowIndex, int columnIndex) {
     return false;
    }
   });

kooyee 2008-02-29 21:07 发表评论

Swing关闭和打开frame

kooyee — Sat, 23 Feb 2008 15:30:00 GMT

1�?br />
close frame

frame.dispose();//not fire INTERNAL_FRAME_CLOSING event, but fire INTERNAL_FRAME_CLOSED event

frame.setClosed(true);//fire INTERNAL_FRAME_CLOSING event and INTERNAL_FRAME_CLOSED event

open frame

jDesktopPane.remove(frame);
jDesktopPane.add(frame);
frame.show();

在添加frame之前必须先把旧的�U�d��父容�? 解除和原来父容器的联�p? 否则会导�?br /> illegal component position. ( �׃��覆盖了原先添加的位置�Q�虽然是同一个object).

//if frame not exist or closed
        if (frame == null||frame.isClosed()) {
            frame = new Frame();
            jDesktopPane.remove(frame);
            jDesktopPane.add(frame);
            frame.setVisible(true);
        }

        //if not create new frame object use following
        //if (!frame.isShowing()){
        //    jDesktopPane.remove(frame);
        //    jDesktopPane.add(frame);
        //    frame.setVisible(true);
        //}

//to active the frame
        try {
            frame.setSelected(true);
        } catch (Exception e) {
            e.printStackTrace();
        }

2�?br />
如果从frame的子容器中的button�{�去关闭frame�Q�要�?br />

JInternalFrame parent = (JInternalFrame)this.getRootPane().getParent();//得到frame
parent.dispose();

先得到子控�g的顶�H�格�Q�rootPane的parent才是上层的frame控�g�?如果直接用this.getParent�Q�）得到的只是包含这个控件的容器�Q�JPanel�{�）�?

3�?br />
通过Matisse在一个class中添加多个frames�Q?eclipse中在design view状态下右键outline 中Other Components��L��加其他控�Ӟ��包括internal frame�?br />

4�?br />
frame

isClosed() 验证是否关闭�Q�没建立frame实例是，return false�?当徏立实例后�Q�frame昄��则return false�Q�frame dispose后return true

isShowing() 验证是否昄��Q�不再desktop或其他container中显�C�，�q�return false�?br />
�Ȁ�z�active a frame 使用�Q?br /> setSelected(true)

kooyee 2008-02-23 23:30 发表评论

按键退出applet or frame

kooyee — Sat, 16 Feb 2008 15:12:00 GMT

exit = new javax.swing.JButton();

exit.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(java.awt.event.ActionEvent evt) {
             exitActionPerformed(evt);
        }
});

private void exitActionPerformed(java.awt.event.ActionEvent evt) {
        try {
                 System.exit(0);
     } catch (Exception e){
            input.setText("Error: " + e.toString());
        }
    }

对于frame除了�q�个�Ҏ��?�q�可以用dispose()

btnClose.addActionListener(

                        new ActionListener()
                       {
                               // pass query to tthe frame
                             public void actionPerformed( ActionEvent event )
                             {

                                 dispose();

                             } // end actionPerformed
                         }  // end ActionListener inner class
                      ); // end call to addActionListener

kooyee 2008-02-16 23:12 发表评论

Swing Textfield ��d�� Text limit 功能

kooyee — Sat, 16 Feb 2008 14:57:00 GMT

�?textfield加入 KeyTyped event. 然后加入以下event代码

    int textLimit = 20
    private void jTextCashierKeyTyped(java.awt.event.KeyEvent evt) {
        //not input character if great than textlimit
        if (jTextCashier.getText().length() == textLimit) {
            evt.consume();
        }
    }

�q�样当输入文字长度�ؓ限制的长度时�Q�则不处理事件�?�q�样辑ֈ�没有输入的效�?

    MOUSE_PRESS=1, //表示鼠标压下
    MOUSE_RELEASE=2,// 表示鼠标在不同位�|�释�?br />     MOUSE_CLICK=3, //表示鼠标在同一位置点击
    MOUSE_ENTER=4,//鼠标�q�入
    MOUSE_EXIT=5;//鼠标��d��

kooyee 2008-02-16 22:57 发表评论

[Swing] 使用Matisse�q�行swing�~�程

kooyee — Sat, 09 Feb 2008 10:55:00 GMT

摘要: 使用eclipse的插�Ӟ��首先设计form。然后可以把自己的code�Q�后台操作的代码写入到form的code�? 但是要注�? /** *//** This method is called from within the constructor to &nbs... 阅读全文

kooyee 2008-02-09 18:55 发表评论

kooyee — Fri, 08 Feb 2008 12:19:00 GMT

Swing中提供了JOptionPane�c�L��实现�c�M��Windows�q�_��下的MessageBox的功能，同样在Java中也有，利用JOptionPane�c�M��的各个static�Ҏ��来生成各�U�标准的对话框，实现昄��Z��息、提出问题、警告、用戯��入参数等功能。这些对话框都是模式对话框�?

　　ConfirmDialog　---　��认对话框，提出问题�Q�然后由用户自己来确认（�?Yes"�?No"按钮�Q?/p>

　　InputDialog　---　提示输入文本

　　MessageDialog　---　昄��信息

　　OptionDialog　-�Q�　�l�合其它三个对话框类型�?/p>

　　�q�四个对话框可以采用showXXXDialog()来显�C�，如showConfirmDialog()昄��认对话框、showInputDialog()昄��输入文本对话框、showMessageDialog()昄��信息对话框、showOptionDialog()昄��选择性的对话框。它们所使用的参数说明如下：

　　�?ParentComponent�Q�指�C�对话框的父�H�口对象�Q�一般�ؓ当前�H�口。也可以为null即采用缺省的Frame作�ؓ父窗口，此时对话框将讄��在屏�q�的正中�?/p>

　　�?message�Q�指�C��在对话框内显�C�的描述性的文字

　　�?String title�Q�标题条文字丌Ӏ?/p>

　　�?Component�Q�在对话框内要显�C�的�l��g�Q�如按钮�Q?/p>

　　�?Icon�Q�在对话框内要显�C�的图标

　　�?messageType�Q�一般可以�ؓ如下的值ERROR_MESSAGE、INFORMATION_MESSAGE、WARNING_MESSAGE、QUESTION_MESSAGE、PLAIN_MESSAGE�?/p>

　　�?optionType�Q�它军_��在对话框的底部所要显�C�的按钮选项。一般可以�ؓDEFAULT_OPTION、YES_NO_OPTION、YES_NO_CANCEL_OPTION、OK_CANCEL_OPTION�?/p>

　　使用实例�Q?/p>

　　(1) 昄��MessageDialog

JOptionPane.showMessageDialog(null, "在对话框内显�C�的描述性的文字", "标题条文字串", JOptionPane.ERROR_MESSAGE);

　　(2) 昄��ConfirmDialog

JOptionPane.showConfirmDialog(null, "choose one", "choose one", JOptionPane.YES_NO_OPTION);
            if (n == JOptionPane.YES_OPTION) {
            setLabel("OK. Keep an eye on your wallet.");
          } else if (n == JOptionPane.NO_OPTION) {
            setLabel("Whew! Good choice.");
          } else {
            setLabel("It is your civic duty to cast your vote.");
          }

　　(3) 昄��OptionDialog�Q�该�U�对话框可以��q��戯��己来讄��各个按钮的个数�ƈ�q�回用户点击各个按钮的序��P��?开始计敎ͼ�

Object[] options = {"��定","取消","帮助"};
int response=JOptionPane.showOptionDialog(this, "�q�是个选项对话框，用户可以选择自己的按钮的个数", "选项对话框标�?/span>",JOptionPane.YES_OPTION, JOptionPane.QUESTION_MESSAGE, null, options, options[0]);
if(response==0)
{
　this.setTitle("您按下了�W�OK按钮 ");
}
else if(response==1)
{
　this.setTitle("您按下了�W�Cancel按钮 ");
}
else if(response==2)
{
　this.setTitle("您按下了�W�Help按钮 ");
}　

　　(4) 昄��InputDialog 以便让用戯��行输�?/p>

String inputValue = JOptionPane.showInputDialog("Please input a value");

　　(5) 昄��InputDialog 以便让用戯��行选择地输�?/p>

Object[] possibleValues = { "First", "Second", "Third" }; //用户的选择��目
Object selectedValue = JOptionPane.showInputDialog(null, "Choose one", "Input",JOptionPane.INFORMATION_MESSAGE, null, possibleValues, possibleValues[0]);
setTitle("您按下了"+(String)selectedValue+"��目");

kooyee 2008-02-08 20:19 发表评论

kooyee — Fri, 08 Feb 2008 10:08:00 GMT

AWT Label 不支持多行文字，解决的方法是建立多个label实现多行在panel中，或者徏立自��q��控�g

�?nbsp;Swing 中可以在text的值用HTML��d��玎ͼ�

String htmlLabel = "^HTML _Label
" +

      ""#FF0080\">Multi-line";

JLabel label = new JLabel(htmlLabel);

如果用\n或\r�Q�则需要定义自��q��Swing控�g�?/p>

kooyee 2008-02-08 18:08 发表评论

kooyee — Sat, 02 Feb 2008 14:30:00 GMT

用setBackground(color)

把label的背景色设成你想要的�Q�然后修改label的不透明属�?opaque)设�ؓtrue

kooyee 2008-02-02 22:30 发表评论