Socket编程入门

在网上看了半天，看得迷迷糊糊、不知所云，索性打开eclipse小小的试了一下。说是试一下，其实就是把别人的例子敲了一遍，不过思路总算比之前清晰多了
例子是这样的：用户在客户端输入一句话，就在服务器端打印出来，同时服务器会发送“received”的信息返给客户端，挺简单的吧！

那么我们就开始了，首先是服务器端
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 MyServer {

public static void main(String[] args)throws IOException {
  
   ServerSocket server = new ServerSocket(5678);
   Socket client = server.accept();
   BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
   PrintWriter out = new PrintWriter(client.getOutputStream());
   while(true){
    String s = in.readLine();
    System.out.println(s);
    out.println("received");
    out.flush();
    if(s.equals("end"))
     break;
   }
   client.close();
}

}

客户端：
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;

public class Client {

static Socket server;

public static void main(String[] args)throws Exception {
  
   server = new Socket(InetAddress.getLocalHost(),5678);
   BufferedReader in = new BufferedReader(new InputStreamReader(server.getInputStream()));
   PrintWriter out = new PrintWriter(server.getOutputStream());
   System.out.print("Please Enter:");
   BufferedReader wt = new BufferedReader(new InputStreamReader(System.in));
   while(true){
    String s = wt.readLine();
    out.println(s);
    out.flush();
    System.out.println(in.readLine());
    if(s.equals("end"))
     break;
   }
   server.close();  
}
}

InetAddress.getLocalHost()是获得本机IP