java聊天程序群聊，私聊，传输文件，截图等功能

package chat;

/**
 * CaptureScreen.java
 */
import java.awt.*;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import javax.imageio.*;
import java.awt.image.*;

public class CaptureScreen extends Jframe implements ActionListener {
    private JButton startcancel;
    private JPanel c;
    private BufferedImage get;
    private JTabbedPane jtp;//一个放置很多份图片
    private int index;//一个一直会递增的索引用于标认图片
    private JRadioButton javasystem;//JAVA界面系统界面
    /** Creates a new instance of CaptureScreen */
    public CaptureScreen（） {
        super（“屏幕截取“）;
        try{
            UIManager.setLookAndFeel（UIManager.getSystemLookAndFeelClassName（））;
        }catch（Exception exe）{
            exe.printStackTrace（）;
        }
        initWindow（）;
        initOther（）;
    }
    private void initOther（）{
        jtp=new JTabbedPane（JTabbedPane.TOPJTabbedPane.SCROLL_TAB_LAYOUT）;
    }
    private void initWindow（）{
        start=new JButton（“开始截取“）;
        cancel=new JButton（“退出“）;
        start.addActionListener（this）;
        cancel.addActionListener（this）;
        JPanel buttonJP=new JPanel（）;
        c=new JPanel（new BorderLayout（））;
        JLabel jl=new JLabel（“屏幕截取“ JLabel.CENTER）;
        JLabel jl1=new JLabel（“提示：双击选定区域进行保存等操作“JLabel.CENTER）;
        jl.setFont（new Font（“黑体“Font.BOLD40））;
        jl1.setFont（new Font（“宋体“Font.BOLD20））;
        jl.setForeground（Color.RED）;
        jl1.setForeground（Color.BLUE）;
        c.add（jlBorderLayout.CENTER）;
        c.add（jl1BorderLayout.SOUTH）;
        buttonJP.add（start）;
        buttonJP.add（cancel）;
        buttonJP.setBorder（BorderFactory.createtitledBorder（“公共操作区“））;
        JPanel jp=new JPanel（）;//放置两个单选按钮的面板
        jp.add（java=new JRadioButton（“java界面“））;
        jp.add（system=new JRadioButton（“系统界面“true））;
        java.addActionListener（this）;
        system.addActionListener（this）;
        jp.setBorder（BorderFactory.createtitledBorder（“界面风格“））;
        ButtonGroup bg=new ButtonGroup（）;
        bg.add（java）;
        bg.add（system）;
        JPanel all=new JPanel（）;
        all.add（jp）;
        all.add（buttonJP）;
        this.getContentPane（）.add（cBorderLayout.CENTER）;
        this.getContentPane（）.add（allBorderLayout.SOUTH）;
        this.setSize（500400）;
        this.setLocationRelativeTo（null）;
        this.setVisible（true）;
        this.setAlwaysOnTop（true）;
        this.setDefaultCloseOperation（Jframe.DISPOSE_ON_CLOSE）;
    }
    
    private void updates（）{
        this.setVisible（true）;
        if（get!=null）{
            //如果索引是0则表示一张图片都没有被加入过
            //则要清除当前的东西重新把tabpane放进来
            if（index==0）{
                c.removeAll（）;
                c.add（jtpBorderLayout.CENTER）;
            }else{//否则的话直接对tabpane添加面板就可以了
                

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2009-07-14 15:07  testmychatroom1.6
     文件         232  2009-07-12 14:02  testmychatroom1.6.classpath
     文件         393  2009-07-12 14:02  testmychatroom1.6.project
     目录           0  2011-01-06 20:26  testmychatroom1.6in
     目录           0  2011-01-06 20:26  testmychatroom1.6inchat
     文件       39801  2009-07-13 09:02  testmychatroom1.6inchat1.gif
     文件        1254  2009-04-16 21:18  testmychatroom1.6inchat2.gif
     文件        8000  2008-11-22 00:37  testmychatroom1.6inchatButtonSenddown.gif
     文件        1393  2011-01-06 20:26  testmychatroom1.6inchatCaptureScreen$1.class
     文件         506  2011-01-06 20:26  testmychatroom1.6inchatCaptureScreen$2.class
     文件         938  2011-01-06 20:26  testmychatroom1.6inchatCaptureScreen$BMPfilter.class
     文件         938  2011-01-06 20:26  testmychatroom1.6inchatCaptureScreen$GIFfilter.class
     文件         938  2011-01-06 20:26  testmychatroom1.6inchatCaptureScreen$JPGfilter.class
     文件        2272  2011-01-06 20:26  testmychatroom1.6inchatCaptureScreen$PicPanel.class
     文件        1052  2011-01-06 20:26  testmychatroom1.6inchatCaptureScreen$PNGfilter.class
     文件        8289  2011-01-06 20:26  testmychatroom1.6inchatCaptureScreen$Temp.class
     文件        9332  2011-01-06 20:26  testmychatroom1.6inchatCaptureScreen.class
     文件         651  2011-01-06 20:28  testmychatroom1.6inchatChatframe$1.class
     文件        3837  2011-01-06 20:28  testmychatroom1.6inchatChatframe$acceptfilethread.class
     文件        2922  2011-01-06 20:28  testmychatroom1.6inchatChatframe$FontAttrib.class
     文件        4114  2011-01-06 20:28  testmychatroom1.6inchatChatframe$sendfilethread.class
     文件       19390  2011-01-06 20:28  testmychatroom1.6inchatChatframe.class
     文件         596  2011-01-06 20:28  testmychatroom1.6inchatConnect$1.class
     文件        7497  2011-01-06 20:28  testmychatroom1.6inchatConnect.class
     文件        9220  1998-05-02 04:01  testmychatroom1.6inchatmsg.wav
     文件        2611  2011-01-06 20:26  testmychatroom1.6inchatMyTextArea.class
     文件        4023  2011-01-06 20:26  testmychatroom1.6inchatPList.class
     文件        1033  2011-01-06 20:26  testmychatroom1.6inchatPopupListener.class
     文件        1692  2011-01-06 20:26  testmychatroom1.6inchatStates.class
     目录           0  2011-01-06 20:26  testmychatroom1.6inserver
     文件        3315  2011-01-06 20:26  testmychatroom1.6inserverChatServer.class
............此处省略594个文件信息