Java socket 实现tcp通信

客户端：Client

package socket;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.net.Socket;import java.net.UnknownHostException;public class Client {private static final String SERVER_IP = "localhost";private static final int PORT = 9999;public static void main(String [] args) throws UnknownHostException, IOException{Socket socket = new Socket(SERVER_IP, PORT);//BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getOutputStream()));BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));writer.write("message");writer.flush();socket.close();}}

服务器端：Server

package socket;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.ServerSocket;import java.net.Socket;public class Server {private static final int PORT = 9999;public static void main(String [] args) throws IOException{ServerSocket server = new ServerSocket(PORT);Socket socket = server.accept();BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));System.out.println("server : "+reader.readLine());socket.close();}}