求读串口的applet

各位帮帮我啊
package com;/*
程序文件名称：ReadComm.java
功能：从串行口COM1中接收数据
*/
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.comm.*; class R_Frame extends Frame implements Runnable,ActionListener,SerialPortEventListener
   {
/* 检测系统中可用的通讯端口类 */
   static CommPortIdentifier portId;
/* Enumeration 为枚举型类,在java.util中 */
   static Enumeration portList;
   InputStream inputStream;
/* 声明RS-232串行端口的成员变量 */
   SerialPort serialPort;
   Thread readThread;
   String str="";
   TextField out_message=new TextField("上面文本框显示接收到的数据");
   TextArea in_message=new TextArea();
   Button btnOpen=new Button("打开串口");
/*建立窗体*/
  R_Frame()
  {
   super("串口接收数据");
   setSize(200,200);
   setVisible(true);
   btnOpen.addActionListener(this);
   add(out_message,"South");
   add(in_message,"Center");
   add(btnOpen,"North");



   /*获取系统中所有的通讯端口 */
    portList=CommPortIdentifier.getPortIdentifiers();
      /* 用循环结构找出串口 */
    while (portList.hasMoreElements()){
     /*强制转换为通讯端口类型*/
    portId=(CommPortIdentifier)portList.nextElement();
    if(portId.getPortType() == CommPortIdentifier.PORT_SERIAL){
       if (portId.getName().equals("COM1")) {
         try {
       serialPort = (SerialPort) portId.open("ReadComm", 2000);
       out_message.setText("已打开端口COM1 ,正在接收数据..... ");
       }
    catch (PortInUseException e) { }    /*设置串口监听器*/
    try {
    serialPort.addEventListener(this);
    }
    catch (TooManyListenersException e) { }
    /* 侦听到串口有数据,触发串口事件*/
    serialPort.notifyOnDataAvailable(true);
    } //if end
    } //if end
    } //while end
    readThread = new Thread(this);
    readThread.start(); //线程负责每接收一次数据休眠20秒钟
    } //R_Frame() end

   /*点击按扭所触发的事件：打开串口,并监听串口. */
   public void actionPerformed(ActionEvent event)
   {
     /*获取系统中所有的通讯端口 */
     portList=CommPortIdentifier.getPortIdentifiers();
     /* 用循环结构找出串口 */
     while (portList.hasMoreElements()){
    /*强制转换为通讯端口类型*/
    portId=(CommPortIdentifier)portList.nextElement();
    if(portId.getPortType() == CommPortIdentifier.PORT_SERIAL){
    if (portId.getName().equals("COM1")) {
     try {
     serialPort = (SerialPort) portId.open("ReadComm", 2000);
     out_message.setText("已打开端口COM1 ,正在接收数据..... ");
    }
    catch (PortInUseException e) { }   /*设置串口监听器*/
    try {
    serialPort.addEventListener(this);
    }
    catch (TooManyListenersException e) { }
   /* 侦听到串口有数据,触发串口事件*/
    serialPort.notifyOnDataAvailable(true);
    } //if end
    } //if end
    } //while end
    readThread = new Thread(this);
    readThread.start(); //线程负责每接收一次数据休眠20秒钟
    } //actionPerformed() end    /*接收数据后休眠20秒钟*/
    public void run() {
    try {
    Thread.sleep(20000);
    }
   catch (InterruptedException e) { }
    } //run() end    /*串口监听器触发的事件，设置串口通讯参数，读取数据并写到文本区中*/
    public void serialEvent(SerialPortEvent event) {
   /*设置串口通讯参数：波特率、数据位、停止位、奇偶校验*/
    try {
    serialPort.setSerialPortParams(9600,
    SerialPort.DATABITS_8,
    SerialPort.STOPBITS_1,
    SerialPort.PARITY_NONE);
    }
    catch (UnsupportedCommOperationException e) {}
    byte[] readBuffer = new byte[20];
    try {
    inputStream = serialPort.getInputStream();
    }
    catch (IOException e) {}
    try {     while (inputStream.available() > 0)
     {
       int numBytes = inputStream.read(readBuffer);
        } //while end
       str=new String(readBuffer);
    /*接收到的数据存放到文本区中*/
       in_message.append(str+"\n");
       }
       catch (IOException e){
       }
      } //serialEvent() end
    } //类R_Frame end    public class ReadComm
    {
    public static void main(String args[])
    {
    /* 实例化接收串口数据的窗体类 */
    R_Frame R_win=new R_Frame();
    /* 定义窗体适配器的关闭按钮功能 */
    R_win.addWindowListener(new WindowAdapter()
    {
     public void windowClosing(WindowEvent e)
    {
     System.exit(0);
     }
   });
    R_win.pack();
   }
}怎么改成Applet
??

调试易

求读串口的applet

解决方案 »