tcp和udp的区别,测试实例

package com.server;import java.io.OutputStreamWriter;import .Socket;public class TCPClient {/*** @param args* @author zzy*/public static void main(String[] args) throws Exception {Socket s = new Socket("127.0.0.1", 8083);OutputStreamWriter w = new OutputStreamWriter(s.getOutputStream());w.write("这里是客户端，Hello服务器,准备发到服务器端");w.flush();w.close();s.close();}}package com.server;import java.io.InputStreamReader;import .ServerSocket;import .Socket;public class TCPServer {/*** @param args* @author zzy*/public static void main(String[] args) throws Exception {ServerSocket ss = new ServerSocket(8083);while (true) {Socket s = ss.accept();System.err.println("A client has heen connected.");System.err.println("这里是服务器端"+TCPServer.class);InputStreamReader r = new InputStreamReader(s.getInputStream());int c = 0;while ((c = r.read()) > -1) {System.err.print((char) c);}r.close();s.close();}}}package com.server;import java.io.IOException;import .DatagramPacket;import .DatagramSocket;import .InetAddress;public class UDPClient {private byte[] buffer = new byte[1024];private DatagramSocket ds = null;/*** 构造函数，创建UDP客户端** @throws Exception* @author zzy*/public UDPClient() throws Exception {ds = new DatagramSocket();}/*** 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* @author zzy*/public final void setSoTimeout(final int timeout) throws Exception { ds.setSoTimeout(timeout);}/*** 获得超时时间.** @return 返回超时时间* @throws Exception* @author zzy*/public final int getSoTimeout() throws Exception {return ds.getSoTimeout();}public final DatagramSocket getSocket() {return ds;}/*** 向指定的服务端发送数据信息.** @param host* 服务器主机地址* @param port* 服务端端口* @param bytes* 发送的数据信息* @return 返回构造后俄数据报* @throws IOException* @author zzy*/public final DatagramPacket send(final String host, final int port,final byte[] bytes) throws IOException {DatagramPacket dp = new DatagramPacket(bytes, bytes.length, InetAddress .getByName(host), port);ds.send(dp);return dp;}/*** 接收从指定的服务端发回的数据.** @param lhost* 服务端主机* @param lport* 服务端端口* @return 返回从指定的服务端发回的数据.* @throws Exception* @author zzy*/public final String receive(final String lhost, final int lport)throws Exception {DatagramPacket dp = new DatagramPacket(buffer, buffer.length);ds.receive(dp);String info = new String(dp.getData(), 0, dp.getLength());return info;}/*** 关闭udp连接.**/public final void close() {try {ds.close();} catch (Exception ex) {ex.printStackTrace();}}/*** 测试客户端发包和接收回应信息的方法.** @param args* @throws Exception* @author zzy*/public static void main(String[] args) throws Exception {UDPClient client = new UDPClient();String serverHost = "127.0.0.1";int serverPort = 3366;client.send(serverHost, serverPort, ("你好!").getBytes());String info = client.receive(serverHost, serverPort);System.out.println("服务端回应数据：" + info);}}package com.server;import java.io.IOException;import .DatagramPacket;import .DatagramSocket;import .InetAddress;import .InetSocketAddress;import .SocketException;/*** @author zzy* */public class UDPServer {private byte[] buffer = new byte[1024];private DatagramSocket ds = null;private DatagramPacket packet = null;private InetSocketAddress socketAddress = null;private String orgIp;/*** 构造函数，绑定主机和端口.** @param host* 主机* @param port* 端口* @throws Exception*/public UDPServer(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 .getAddress(), packet.getPort());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 = 3366;UDPServer udpServerSocket = new UDPServer(serverHost, serverPort);while (true) {udpServerSocket.receive();udpServerSocket.response("你好,漠漠之花!");}}}。