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学过计算机网络通信的都知道，计算机之间传送数据由两种，即TCP通信和UDP通信。TCP是可靠的面向连接的通信协议，二UDP是不可靠的面向无连接的通信协议。
java中有基于TCP的网络套接字通信，也有基于UDP的用户数据报通信，UDP的信息传输速度快，但不可靠！
基于UDP通信的基本模式：
（1）将数据打包，称为数据包（好比将信件装入信封一样），然后将数据包发往目的地。
（2）接受别人发来的数据包（好比接收信封一样），然后查看数据包中的内容。
客户机
复制代码 代码如下: package com.client.view;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.ObjectOutputStream;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import com.tools.ClientToServerThread;
/**
* @author lenovo
*
*/
public class JChatFrm extends JFrame implements ActionListener{
JTextArea jta;
JTextField jtf;
JButton jb;
JPanel jp;
String ownerId;
String friendId;
ClientToServerThread ctsT;
public static void main(String[] args) {
// TODO Auto-generated method stub
new JChatFrm();
}
public JChatFrm()
{
setTitle("客户端");
jta=new JTextArea();
jtf=new JTextField(15);
jb=new JButton("发送");
jb.addActionListener(this);
jp=new JPanel();
jp.add(jtf);
jp.add(jb);
this.add(jta,"Center");
this.add(jp,"South");
// this.setTitle(ownerId+" 正在和 "+friend+" 聊天");
this.setIconImage((new ImageIcon("image/qq.gif").getImage()));
// this.setSize(300,200);
this.setBounds(300,200,300,200);
this.setVisible(true);
setDefaultCloSEOperation(JFrame.DISPOSE_ON_CLOSE);
ctsT = new ClientToServerThread(jta);
ctsT.start();
/**窗体关闭按钮事件*/
this.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
if(JOptionPane.showConfirmDialog(null,"<html><font size=3>确定退出吗？</html>","系统提示",JOptionPane.OK_CANCEL_OPTION,JOptionPane.INFORMATION_MESSAGE)==0)
{
System.exit(0);
ctsT.closeSocket();
}
else
{
return;
}
}
}
);
}
//写一个方法，让它显示消息
public void showMessage(String message)
{
String info= message;
this.jta.append(info);
}
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
if(arg0.getSource()==jb)
{
byte buffer[] = jtf.getText().trim().getBytes();
ctsT.sendData(buffer);
}
}
}
复制代码 代码如下: package com.tools;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.Socket;
import java.util.Properties;
import javax.swing.JTextArea;
import com.common.User;
/**
* @author lenovo
*
*/
public class ClientToServerThread extends Thread{
private String serverIP = "127.0.0.1";
private int serverPORT = 8888;
private int receivePORT = 6666;
//声明发送信息的数据报套结字
private DatagramSocket sendSocket = null;
//声明发送信息的数据包
private DatagramPacket sendPacket = null;
//声明接受信息的数据报套结字
private DatagramSocket receiveSocket = null;
//声明接受信息的数据报
private DatagramPacket receivePacket = null;
//收发数据的端口
private int myPort = 0;
//接收数据主机的IP地址
private String friendIP = null;
private int friendPort = 0;
//缓冲数组的大小
public static final int BUFFER_SIZE = 5120;
private byte inBuf[] = null; //接收数据的缓冲数组
private byte outBuf[] = null; //发送数据的缓冲数组
JTextArea jta;
// 构造函数
public ClientToServerThread(JTextArea jta) {
this.jta = jta;
getPropertiesInfo();
}
public void run() {
String receiveInfo = "";
try{
inBuf = new byte[BUFFER_SIZE];
receivePacket = new DatagramPacket(inBuf,inBuf.length);
receiveSocket = new DatagramSocket(receivePORT);
}catch (Exception e) {
e.printStackTrace();
// TODO: handle exception
}
while (true) {
if(receiveSocket == null){
break;
} else {
try {
receiveSocket.receive(receivePacket);
String message = new String(receivePacket.getData(),receivePacket.getLength());
jta.append("收到数据"+message+"n");
} catch (Exception e) {
e.printStackTrace();
// TODO: handle exception
}
}
}
}
/**
* 该方法用来获得服务器属性文件中的IP、PORT
*/
private void getPropertiesInfo(){
Properties prop = new Properties();
InputStream inStream = Thread.currentThread().getContextClassLoader()
.getResourceAsStream("ServerInfo.properties");
try{
//获得相应的键值对
prop.load(inStream);
}catch(IOException e){
e.printStackTrace();
}
//根据相应的键获得对应的值
serverIP = prop.getProperty("serverip");
serverPORT = Integer.parseInt(prop.getProperty("serverudp.port"));
receivePORT = Integer.parseInt(prop.getProperty("receiveudp.port"));
}
public void sendData(byte buffer[]){
try{
InetAddress address = InetAddress.getByName(serverIP);
// outBuf = new byte[BUFFER_SIZE];
sendPacket = new DatagramPacket(buffer,buffer.length,address,serverPORT);
sendSocket = new DatagramSocket();
sendSocket.send(sendPacket);
}catch (Exception e) {
e.printStackTrace();
// TODO: handle exception
}
}
public void closeSocket(){
receiveSocket.close();
}
}
服务器：
复制代码 代码如下: package com.server.view;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.ObjectOutputStream;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import com.tools.ClientToServerThread;
/**
* @author lenovo
*
*/
public class JChatFrm extends JFrame implements ActionListener{
JTextArea jta;
JTextField jtf;
JButton jb;
JPanel jp;
String ownerId;
String friendId;
ClientToServerThread ctsT;
public static void main(String[] args) {
// TODO Auto-generated method stub
new JChatFrm();
}
public JChatFrm()
{
setTitle("服务器");
jta=new JTextArea();
jtf=new JTextField(15);
jb=new JButton("发送");
jb.addActionListener(this);
jp=new JPanel();
jp.add(jtf);
jp.add(jb);
this.add(jta,JOptionPane.INFORMATION_MESSAGE)==0)
{
System.exit(0);
ctsT.closeSocket();
}
else
{
return;
}
}
}
);
}
//写一个方法，让它显示消息
public void showMessage(String message)
{
String info= message;
this.jta.append(info);
}
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
if(arg0.getSource()==jb)
{
byte buffer[] = jtf.getText().trim().getBytes();
ctsT.sendData(buffer);
}
}
}
复制代码 代码如下: package com.tools;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.Socket;
import java.util.Properties;
import javax.swing.JTextArea;
import com.common.User;
/**
* @author lenovo
*
*/
public class ClientToServerThread extends Thread{
private String sendIP = "127.0.0.1";
private int sendPORT = 6666;
private int receivePORT = 8888;
//声明发送信息的数据报套结字
private DatagramSocket sendSocket = null;
//声明发送信息的数据包
private DatagramPacket sendPacket = null;
//声明接受信息的数据报套结字
private DatagramSocket receiveSocket = null;
//声明接受信息的数据报
private DatagramPacket receivePacket = null;
//收发数据的端口
private int myPort = 0;
//接收数据主机的IP地址
private String friendIP = null;
private int friendPort = 0;
//缓冲数组的大小
public static final int BUFFER_SIZE = 5120;
private byte inBuf[] = null; //接收数据的缓冲数组
private byte outBuf[] = null; //发送数据的缓冲数组
JTextArea jta;
// 构造函数
public ClientToServerThread(JTextArea jta) {
this.jta = jta;
getPropertiesInfo();
}
public void run() {
String receiveInfo = "";
try{
inBuf = new byte[BUFFER_SIZE];
receivePacket = new DatagramPacket(inBuf,receivePacket.getLength());
jta.append("收到数据"+message+"n");
} catch (Exception e) {
e.printStackTrace();
// TODO: handle exception
}
}
}
}
/**
* 该方法用来获得服务器属性文件中的IP、PORT
*/
private void getPropertiesInfo(){
Properties prop = new Properties();
InputStream inStream = Thread.currentThread().getContextClassLoader()
.getResourceAsStream("ServerInfo.properties");
try{
//获得相应的键值对
prop.load(inStream);
}catch(IOException e){
e.printStackTrace();
}
//根据相应的键获得对应的值
receivePORT = Integer.parseInt(prop.getProperty("serverudp.port"));
}
public void sendData(byte buffer[]){
try{
InetAddress address = InetAddress.getByName(sendIP);
// outBuf = new byte[BUFFER_SIZE];
sendPacket = new DatagramPacket(buffer,sendPORT);
sendSocket = new DatagramSocket();
sendSocket.send(sendPacket);
}catch (Exception e) {
e.printStackTrace();
// TODO: handle exception
}
}
public void closeSocket(){
receiveSocket.close();
}
}
运行截图：
（编辑：李大同）
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