mainframe.java

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import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;
import java.net.InetAddress;
import javax.media.*;
import javax.swing.*;
import javax.swing.border.*;

public class MainFrame extends Frame{
  MainPlayer  mainPlayer = null;                            // 播放器类对象
  RTPTransmit rtpTransmit = null;                           // RTP传输类对象

  Label labelTopLeft = new Label();
  Label labelX = new Label();
  TextField textFieldX = new TextField();                   // 截图起点的x坐标编辑框
  Label labelY = new Label();
  TextField textFieldY = new TextField();                   // 截图起点的y坐标编辑框

  Label labelArea = new Label();
  CheckboxGroup checkboxGroupSize = new CheckboxGroup();
  Checkbox checkboxSize1 = new Checkbox();                   // 图像尺寸大小单选按钮
  Checkbox checkboxSize2 = new Checkbox();
  Checkbox checkboxSize3 = new Checkbox();

  Label labelFrameRate = new Label();
  TextField textFieldFrameRate = new TextField();            // 每秒采样帧数编辑框
  JLabel jLabel1 = new JLabel();

  Label labelIP = new Label();
  TextField textIPAdd1 = new TextField();                   // IP地址编辑框
  TextField textIPAdd4 = new TextField();
  TextField textIPAdd3 = new TextField();
  TextField textIPAdd2 = new TextField();
  Label labelPort = new Label();
  TextField textPort = new TextField();                      // 端口号编辑框
  JLabel jLabel2 = new JLabel();

  Button buttonBeginTransmit = new Button();                  // “传输”按钮
  Button buttonStopTransmit = new Button();                   // “停止”按钮


  // 设置界面和添加事件的监听
  private void jbInit() throws Exception {
    this.setLayout(null);
    this.setBackground(Color.lightGray);

    labelTopLeft.setText("截图起点坐标：");
    labelTopLeft.setBounds(new Rectangle(42, 70, 86, 20));
    labelX.setText("X:");
    labelX.setBounds(new Rectangle(130, 55, 20, 20));
    textFieldX.setBounds(new Rectangle(155, 55, 40, 20));
    textFieldX.setText("20");     // 缺省的截图起点横坐标为：20
    labelY.setText("Y:");
    labelY.setBounds(new Rectangle(130, 85, 20, 20));
    textFieldY.setBounds(new Rectangle(155, 85, 40, 20));
    textFieldY.setText("20");     // 缺省的截图起点纵坐标为：20

    labelArea.setText("图像大小：");
    labelArea.setBounds(new Rectangle(210, 70, 60, 20));
    checkboxSize1.setLabel("352×288");
    checkboxSize1.setBounds(new Rectangle(275, 50, 80, 20));
    checkboxSize1.setCheckboxGroup(checkboxGroupSize);
    checkboxSize2.setLabel("176×144");
    checkboxSize2.setBounds(new Rectangle(275, 70, 80, 20));
    checkboxSize2.setCheckboxGroup(checkboxGroupSize);
    checkboxSize3.setLabel("128×96");
    checkboxSize3.setBounds(new Rectangle(275, 90, 80, 20));
    checkboxSize3.setCheckboxGroup(checkboxGroupSize);
    checkboxGroupSize.setSelectedCheckbox(checkboxSize1);

    labelFrameRate.setText("每秒采样帧数（1-30）：");
    labelFrameRate.setBounds(new Rectangle(42, 125, 136, 20));
    textFieldFrameRate.setBounds(new Rectangle(200, 125, 138, 20));
    textFieldFrameRate.setText("10");     // 缺省的每秒截图数为：10帧

    jLabel1.setBorder(BorderFactory.createEtchedBorder());
    jLabel1.setBounds(new Rectangle(22, 30, 338, 138));

    labelIP.setText("IP地址：");
    labelIP.setBounds(new Rectangle(42, 206, 52, 20));
    textIPAdd1.setBounds(new Rectangle(130, 206, 40, 20));
    textIPAdd2.setBounds(new Rectangle(186, 206, 40, 20));
    textIPAdd3.setBounds(new Rectangle(242, 206, 40, 20));
    textIPAdd4.setBounds(new Rectangle(298, 206, 40, 20));

    labelPort.setText("端口号：");
    labelPort.setBounds(new Rectangle(42, 244, 52, 20));
    textPort.setBounds(new Rectangle(130, 244, 40, 20));

    jLabel2.setBorder(BorderFactory.createEtchedBorder());
    jLabel2.setBounds(new Rectangle(22, 186, 338, 96));

    buttonBeginTransmit.setLabel("传输");
    buttonBeginTransmit.setBounds(new Rectangle(104, 300, 60, 20));
    buttonBeginTransmit.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonBeginTransmit_actionPerformed(e);
      }
    });

    buttonStopTransmit.setLabel("停止");
    buttonStopTransmit.setBounds(new Rectangle(226, 300, 60, 20));
    buttonStopTransmit.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonStopTransmit_actionPerformed(e);
      }
    });

    this.addWindowListener(new java.awt.event.WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        this_windowClosing(e);
      }
    });

    this.add(labelTopLeft, null);
    this.add(labelX, null);
    this.add(textFieldX, null);
    this.add(labelY, null);
    this.add(textFieldY, null);
    this.add(labelArea, null);
    this.add(checkboxSize1, null);
    this.add(checkboxSize2, null);
    this.add(checkboxSize3, null);

    this.add(labelFrameRate, null);
    this.add(textFieldFrameRate, null);

    this.add(jLabel1, null);

    this.add(labelIP, null);
    this.add(textIPAdd1, null);
    this.add(textIPAdd2, null);
    this.add(textIPAdd3, null);
    this.add(textIPAdd4, null);
    this.add(labelPort, null);
    this.add(textPort, null);
    this.add(jLabel2, null);

    this.add(buttonBeginTransmit, null);
    this.add(buttonStopTransmit, null);

    this.setSize(new Dimension(381, 335));
    this.setTitle("Picture Capture and Transmit");
    this.setVisible(true);
  }

  // 构造函数
  public MainFrame() {
    try {
      jbInit();       // 显示主界面
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  // 得到用户所设定的截图起点
  Point getLocationPicture() {
    int left = Integer.parseInt(textFieldX.getText());
    int top = Integer.parseInt(textFieldY.getText());
    return new Point(left,top);
  }

  // 得到用户所设定的截图尺寸
  Dimension getSizePicture() {
    Dimension size = null;
    if(checkboxGroupSize.getSelectedCheckbox() == checkboxSize1) {
      size = new Dimension(352,288);
    }
    else if(checkboxGroupSize.getSelectedCheckbox() == checkboxSize2) {
      size = new Dimension(176,144);
    }
    else {
      size = new Dimension(128,96);
    }

    return size;
  }

  // 判断输入的截图开始点是否合适
  boolean IsRangeValid() {
    boolean bValid = true;
    Point point = getLocationPicture();
    Dimension dim = getSizePicture();
    Dimension dimScreen = Toolkit.getDefaultToolkit().getScreenSize();    // 得到屏幕尺寸
    if ( point.x + dim.width > dimScreen.width ) {  // 限制截图区域在屏幕宽度之内
      System.err.println("the X must be in the range of [0," + (dimScreen.width - dim.width) + "]");
      bValid = false;
    }
    if ( point.y + dim.height > dimScreen.height ) { // 限制截图区域在屏幕高度之内
      System.err.println("the Y must be in the range of [0," + (dimScreen.height - dim.height) + "]");
      bValid = false;
    }

    return bValid;
  }

  // 响应鼠标点击“停止”按钮的消息
  void buttonBeginTransmit_actionPerformed(ActionEvent e) {
    if(!IsRangeValid())       // 判断输入的截图开始点是否合适
      return;

    String left = textFieldX.getText();
    String top = textFieldY.getText();

    Dimension sizePicture = getSizePicture();
    String width = new Integer(sizePicture.width).toString();
    String height = new Integer(sizePicture.height).toString();

    String frameRate = textFieldFrameRate.getText();

    String strMedia = "screen://"+left+","+top+","+width+","+height+"/"+frameRate;

    System.err.println(strMedia);

    mainPlayer = createNewFrame ();   // 产生一个新的播放窗口
    mainPlayer.open ( strMedia );     // 打开播放窗口开始播放

    MediaLocator mediaLoc = new MediaLocator ( strMedia );       // 产生一个媒体定位器

    String strIPAddr = textIPAdd1.getText()+"."+textIPAdd2.getText()+"."+textIPAdd3.getText()+"."+textIPAdd4.getText();
              // 得到完整的IP地址
    String strPort = textPort.getText();     // 得到端口号

    Format fmt = null;
    rtpTransmit = new RTPTransmit(mediaLoc,strIPAddr, strPort, fmt);

    String result = rtpTransmit.start();    // 开始RTP传输

    if (result != null) {       // 如果不能成功开始传输，则输出错误原因
      System.err.println("Error : " + result);
    }
    else {
      System.err.println("Start transmission ...");
    }
  }

  // 响应鼠标点击“停止”按钮的消息
  void buttonStopTransmit_actionPerformed(ActionEvent e) {
    if(rtpTransmit == null)
      return;

    rtpTransmit.stop();      // 停止传输

    mainPlayer.killCurrentPlayer();      // 删除当前的播放窗口

    System.out.println("...transmission ended.");
  }

  // 产生一个新的播放窗口
  public MainPlayer createNewFrame () {
    MainPlayer mainPlayer = new MainPlayer ();
    mainPlayer.setVisible ( true );     // 显示播放窗口
    mainPlayer.invalidate ();
    mainPlayer.pack ();
    return ( mainPlayer );
  }

  // 主函数
  public static void main(String [] args) {
    new MainFrame();
  }

  // 关闭窗口，退出程序
  void this_windowClosing(WindowEvent e) {
    System.exit(0);
  }
}