Java网络通信套接字

（一）第一个例子是简单的Socket通信，一个客户端和一个服务器线程：

/** * SimpleClient.java */package network;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.Socket;import java.net.UnknownHostException;public class SimpleClient {public static void main(String[] args) {Socket socket = null;BufferedReader reader = null;PrintWriter writer = null;try {//请求建立通信套接字socket  = new Socket("localhost",8089);//获取输入输出流reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));writer = new PrintWriter(socket.getOutputStream(), true);//true means autoFlush //while(true){writer.println("hello, I am Client\n");String mess = reader.readLine();System.out.print("Client Receive:"+mess);//}} catch (UnknownHostException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}finally{try {if(socket != null) socket.close();if(reader != null) reader.close();} catch (IOException e) {e.printStackTrace();}if(writer != null) writer.close();}}}

/** * SimpleServer.java */package network;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.ServerSocket;import java.net.Socket;public class SimpleServer {public static void main(String[] args) {ServerSocket ss = null;//用于接收请求的SocketSocket socket = null;//用于通信的SocketBufferedReader reader = null;PrintWriter writer = null;try {ss = new ServerSocket(8089);System.out.print("waiting for new request...\n");socket = ss.accept();//等待请求，建立通信Socketreader = new BufferedReader(new InputStreamReader(socket.getInputStream()));writer = new PrintWriter(socket.getOutputStream(), true);String mess = reader.readLine();System.out.print("Server Receive:"+mess);writer.println("Yes, I can hear you");} catch (IOException e) {e.printStackTrace();}}}

（二）第二个列子是在服务器端，采用多线程方式处理来自客户端的请求：

/** * TCPClient.java */package network;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.Socket;import java.net.UnknownHostException;public class TCPClient {private static int id = 0;public static void main(String[] args) {String host = "localhost";int port = 8060;Socket socket = null;BufferedReader in = null;PrintWriter out = null;try {//创建五个请求服务器连接的客户端for(int i=0;i<5;i++){//创建通信套接字socket = new Socket(host, port);//获取套接字的输入输出流in = new BufferedReader(new InputStreamReader(socket.getInputStream()));out = new PrintWriter(socket.getOutputStream(), true);//向服务器发送消息out.println("hello, i am client "+(++id));}} catch (UnknownHostException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}finally{System.out.print("Closing Socket...\n");try {if(socket != null) socket.close();if(in != null) in.close();} catch (IOException e) {e.printStackTrace();}if(out != null) out.close();}}}

/** * TCPServer.java */package network;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.ServerSocket;import java.net.Socket;public class TCPServer {public static void main(String[] args) {int port = 8060;Socket socket = null;ServerSocket server = null;try {//创建服务器套接字server = new ServerSocket(port);while(true){//接收来自客户端的请求，建立通信套接字System.out.print("waiting for new request...\n");socket = server.accept();//创建一个线程处理该请求Thread t = new Thread(new ServerThread(socket));t.start();}} catch (IOException e) {e.printStackTrace();}finally{try {if(server != null) server.close();if(socket != null) socket.close();} catch (IOException e) {e.printStackTrace();}}}}/** * 处理来自客户端请求的线程 * */class ServerThread implements Runnable{private Socket socket;public ServerThread(Socket s){this.socket = s;}public void run() {BufferedReader in = null;PrintWriter out = null;try {//获取套接字的输入输出流in = new BufferedReader(new InputStreamReader(socket.getInputStream()));out = new PrintWriter(socket.getOutputStream(), true);//读取客户端发送来的消息String s = in.readLine();System.out.println("recv:"+s);//out.write("accept");} catch (IOException e) {e.printStackTrace();}finally{System.out.print("Closing Connection...\n");try {if(socket != null) socket.close();if(in != null) in.close();} catch (IOException e) {e.printStackTrace();}if(out != null) out.close();}}}