【Java开源代码栏目提醒】:网学会员在Java开源代码频道为大家收集整理了CommunicationClient.java提供大家参考,希望对大家有所帮助!
package communicationclient;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.swing.*;
import java.net.*;
import java.io.*;
/**
* Title: 客户端UDP通讯Applet程序
* Description: 用于客户端,实现与服务器端UDP通讯
* Copyright: Copyright (c) 2002
* Company: 北京师范大学计算机系
* @author 孙一林
* @version 1.0
*/
public class CommunicationClient extends Applet {
boolean isStandalone = false;
JLabel jLabel1 = new JLabel();
JTextArea jTextArea1 = new JTextArea();
JLabel jLabel2 = new JLabel();
JTextField jTextField1 = new JTextField();
private DatagramSocket sendSocket,receiveSocket;//声明发送数据报Socket和接收数据报Socket
private DatagramPacket sendPacket,receivePacket;//声明发送数据报文包和接收数据报文包
/**Get a parameter value*/
public String getParameter(String key, String def) {
return isStandalone ? System.getProperty(key, def) :
(getParameter(key) != null ? getParameter(key) : def);
}
/**Construct the applet*/
public CommunicationClient() {
}
/**Initialize the applet*/
public void init() {
try {
jbInit();
}
catch(Exception e) {
e.printStackTrace();
}
}
/**Component initialization*/
private void jbInit() throws Exception {
jLabel1.setText("通讯记录:");
jLabel1.setBounds(new Rectangle(16, 9, 68, 27));
this.setLayout(null);
jTextArea1.setText("你好!");
jTextArea1.setBounds(new Rectangle(15, 48, 349, 59));
jLabel2.setText("输入通讯内容:");
jLabel2.setBounds(new Rectangle(17, 125, 92, 37));
jTextField1.setText("通讯内容");
jTextField1.setBounds(new Rectangle(127, 129, 244, 31));
jTextField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jTextField1_actionPerformed(e);
}
});
this.add(jLabel1, null);
this.add(jTextArea1, null);
this.add(jLabel2, null);
this.add(jTextField1, null);
}
/**Start the applet*/
public void start() {
waitForPackets();
}
/**Stop the applet*/
public void stop() {
}
/**Destroy the applet*/
public void destroy() {
}
/**Get Applet information*/
public String getAppletInfo() {
return "Applet Information";
}
/**Get parameter info*/
public String[][] getParameterInfo() {
return null;
}
/**方法waitForPacket用来监听来自于服务器的数据报,当获得数据报后,在文本显示区域显示出来*/
public void waitForPackets(){
try{
sendSocket=new DatagramSocket();//实例化一个发送数据报Socket对象
receiveSocket= new DatagramSocket(8001);//实例化一个接收数据报Socket对象,以8001为端口
}
catch (SocketException e){//捕获异常
jTextArea1.append("不能打开数据报Socket,或数据报Socket无法与指定端口连接!");
}
while (true){
try{
byte buf[]=new byte[100];
receivePacket=new DatagramPacket(buf,buf.length);//实例化一个接收数据报文包对象
receiveSocket.receive(receivePacket);//以receivePacket为参数,接收数据包
jTextArea1.append("\n服务器:\t");
byte[] data=receivePacket.getData();
String receivedString=new String(data);
jTextArea1.append(receivedString);//将接收到的数据包中的数据显示出来
}
catch(IOException e){
jTextArea1.append("网络通讯出现错误,问题在"+e.toString());
}
}
}
/**Main method*/
public static void main(String[] args) {
CommunicationClient applet = new CommunicationClient();
applet.isStandalone = true;
Frame frame;
frame = new Frame() {
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
System.exit(0);
}
}
public synchronized void setTitle(String title) {
super.setTitle(title);
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
}
};
frame.setTitle("Applet Frame");
frame.add(applet, BorderLayout.CENTER);
applet.init();
applet.start();
frame.setSize(400,320);
Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
frame.setLocation((d.width - frame.getSize().width) / 2, (d.height - frame.getSize().height) / 2);
frame.setVisible(true);
}
void jTextField1_actionPerformed(ActionEvent e) {
try{
jTextArea1.append("\n客户端:");
String string=jTextField1.getText();
jTextArea1.append(string);
byte[] databyte=new byte[100];
string.getBytes(0,string.length(),databyte,0);
sendPacket=new DatagramPacket(databyte,string.length(),InetAddress.getByName("202.112.88.31"),8000);//发送数据报,其中IP为主机服务器IP地址
sendSocket.send(sendPacket);
}
catch(IOException ioe){
jTextArea1.append("网络通讯出现错误,问题在"+ioe.toString());
}
}
}
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