readcomm.java

用java写的操作串口的程序,界面清楚,操作简单,实用

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"); 
} //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 { 
/* 从线路上读取数据流 */ 
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(); 
} 
}