/**
* 构造函数，绑定主机和端口.
* @param host 主机
* @param port 端口
* @throws Exception
*/
public UdpServerSocket(String host, int port) throws Exception {
socketAddress = new InetSocketAddress(host, port);
ds = new DatagramSocket(socketAddress);
System.out.println("服务端启动!");
}
public final String getOrgIp() {
return orgIp;
}
/**
* 设置超时时间，该方法必须在bind方法之后使用.
* @param timeout 超时时间
* @throws Exception
*/
public final void setSoTimeout(int timeout) throws Exception {
ds.setSoTimeout(timeout);
}
/**
* 获得超时时间.
* @return 返回超时时间.
* @throws Exception
*/
public final int getSoTimeout() throws Exception {
return ds.getSoTimeout();
}
/**
* 绑定监听地址和端口.
* @param host 主机IP
* @param port 端口
* @throws SocketException
*/
public final void bind(String host, int port) throws SocketException {
socketAddress = new InetSocketAddress(host, port);
ds = new DatagramSocket(socketAddress);
}
/**
* 接收数据包，该方法会造成线程阻塞.
* @return 返回接收的数据串信息
* @throws IOException
*/
public final String receive() throws IOException {
packet = new DatagramPacket(buffer, buffer.length);
ds.receive(packet);
orgIp = packet.getAddress().getHostAddress();
String info = new String(packet.getData(), 0, packet.getLength());
System.out.println("接收信息：" + info);
return info;
}
/**
* 将响应包发送给请求端.
* @param bytes 回应报文
* @throws IOException
*/
public final void response(String info) throws IOException {
System.out.println("客户端地址 : " + packet.getAddress().getHostAddress()
+ ",端口：" + packet.getPort());
DatagramPacket dp = new DatagramPacket(buffer, buffer.length, packet
dp.setData(info.getBytes());
ds.send(dp);
}
/**
* 设置报文的缓冲长度.
* @param bufsize 缓冲长度
*/
public final void setLength(int bufsize) {
packet.setLength(bufsize);
}
/**
* 获得发送回应的IP地址.
* @return 返回回应的IP地址
*/
public final InetAddress getResponseAddress() {
return packet.getAddress();
}
/**
* 获得回应的主机的端口.
* @return 返回回应的主机的端口.
*/
public final int getResponsePort() {
return packet.getPort();
}
/**
* 关闭udp监听口.
*/
public final void close() {
try {
ds.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
/**
* 测试方法.
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
String serverHost = "127.0.0.1";
int serverPort = 3344;
UdpServerSocket udpServerSocket = new UdpServerSocket(serverHost, serverPort);
while (true) {
udpServerSocket.receive();
udpServerSocket.response("你好,sterning!");
}
}
}
2. UDP客户端程序
[java]
import java.io.*;
import java.net.*;
/**
* Copyright 2007 GuangZhou Cotel Co. Ltd.
* All right reserved.
* UDP客户端程序，用于对服务端发送数据，并接收服务端的回应信息.
* @author QPING
*/
public class UdpClientSocket {
private byte[] buffer = new byte[1024];