简单实现Socket

Server.java类的实现。

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 Server {


 private ServerSocket server;
 private Socket socket;
 private BufferedReader in;
 private PrintWriter out;

public static final String IP = "127.0.0.1";//这里是IP地址，这个地址可以随便修改（该为你自己的IP）

public static final int PORT = 3333;//这里是设置server的端口号
 
 public void startServer(){
  try {
   server = new ServerSocket(Server.PORT);
   int i = 1 , j = 1;
   while (true) {
    System.out.println("Server listen in Client Request! ");
    socket = server.accept();
    in = new BufferedReader(new InputStreamReader(socket
      .getInputStream()));
    out = new PrintWriter(socket.getOutputStream(), true);

    String line = in.readLine();
    System.out.println("Server get Client send " + i++ + " message:"+line);
    out.print("this Server return Client " + j++ + " message:" + line);
    out.close();
    in.close();
    socket.close();
   }
  } catch (IOException e) {
   e.printStackTrace();
   try {
    socket.close();
   } catch (IOException e1) {
    e1.printStackTrace();
   }
  }
 }
 
 public static void main(String[] args) throws IOException {
  Server server = new Server();
  server.startServer();
 }
}


Client.java的实现:

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;

public class Client {

 private Socket socket;

 public void sendMessage(String message) {
  try {

    //这里初始化Socket 要提供两个参数 server的IP 和 port
   socket = new Socket(Server.IP, Server.PORT);
   socket.setSoTimeout(60000);
   // send message
   PrintWriter ps = new PrintWriter(new OutputStreamWriter(
     new BufferedOutputStream(socket.getOutputStream()), "GBK"),
     true);
   // must use println();
   ps.println(message);

   // read server return message
   BufferedReader br = new BufferedReader(new InputStreamReader(socket
     .getInputStream(), "GBK"));
   StringBuffer sbf = new StringBuffer();
   String str = null;
   int i = 1;
   while ((str = br.readLine()) != null) {
    sbf.append(str);
    System.out.println("Server return " + i++ + " message: "
      + sbf.toString());
   }
   br.close();
  } catch (Exception e) {
   e.printStackTrace();
   try {
    socket.close();
   } catch (IOException e1) {
    e1.printStackTrace();
   }
  }
 }

 public static void main(String[] args) {
  Client client = new Client();
  client.sendMessage("first socket!");
 }
}

注:这个只是个简单的Socket实现，并没有实现多线程访问。