Java Socket进行客户端和服务器进行通信的简单例子

这是一个使用Java Socket 进行客户端和服务器进行通信的简单例子。

有些考试里头会让写这方面的程序，自己动手写写，掌握这个实现过程。理解之后，很快就能写出来了。

而且这个题目值 10 分。

 

服务器端代码：Server.java

[CODE]

import java.net.*;
import java.io.*;

class Server {
private ServerSocket server;
private Socket client;
private BufferedReader in;
private PrintWriter out;

Server(){
   try{
    server = new ServerSocket(1234);
    while(true){
    //获得客户端连接
     client = server.accept();
     //获得客户端的IP和端口
     String remoteIP = client.getInetAddress().getHostAddress();
     int remotePort = client.getLocalPort();
    
     System.out.println("A client connected. IP:" + remoteIP + ", Port: " + remotePort);
     System.out.println();
    
     //获得 client 端的输入输出流，为进行交互做准备
     in = new BufferedReader(new InputStreamReader(client.getInputStream()));
     out = new PrintWriter(client.getOutputStream(),true);
    
     //获得 client 端发送的数据
     String content = in.readLine();   
     System.out.println("Client message is: " + content);
    
    // 向 client 端发送响应数据
     out.println("Your message has been received successfully.");
    
     //关闭各个流
     out.close();
     in.close();
     server.close();   
    }
   }catch(Exception e){
   // 发送响应，接收失败
    out.println("Receive Error!");
   }
}

public static void main(String[] args){
   new Server();
}
}

[CODE]

                         

 

 

 

客户端代码：Client.java

[CODE]

import java.io.*;
import java.net.*;

class Client {
private Socket client;
String serverAddress = "127.0.0.1";
int port = 1234;

BufferedReader in;
PrintWriter out;
Client(){
   try{
   //连接 server 端
    System.out.println("Try connect to server ...");
    client = new Socket(serverAddress,port);
   
   //显示已连接
    System.out.println("Conntected to Server.");
    System.out.println();
   
   //为发送数据做准备
    System.out.println("Enter some characters:");
    in = new BufferedReader(new InputStreamReader(System.in));
    out = new PrintWriter(client.getOutputStream(),true);
   
   // 向 server 发送数据
    out.println(in.readLine() + "/n");
    System.out.println();
   
   //接收来自 server 的响应数据
    in = new BufferedReader(new InputStreamReader(client.getInputStream()));
    System.out.println("Message from server: " + in.readLine());
   
   // 关闭各个流
    in.close();
    out.close();
    client.close();

   }catch(Exception e){
    e.printStackTrace();
   }
}

public static void main(String[] args){
   new Client();
}
}

[CODE]

                         

 

 

 

打开两个终端：

终端一：
javac Server.java
java Server

终端二：
javac Client.java
java Client

即可看到运行结果。

                         

 

 

 

附加一个更加简单的例子， client 端只接收来自 server 端的消息并显示。

服务器端代码：Server.java

[CODE]

import java.net.*;
import java.io.*;

class Server {
private ServerSocket server;
private Socket client;
private int port = 5050;

Server() {
   try {
   
    server = new ServerSocket(port);
   
    client = server.accept();
   
    client.getOutputStream().write("dtmobile".getBytes());

    client.close();   
    server.close();
   } catch(Exception e) {
   
   }
}
public static void main(String[] args) {
   new Server();
}
}

[CODE]

                         

 

 

 

客户端代码：Client.java

[CODE]

import java.net.*;
import java.io.*;

class Client {
private Socket client;
private String host = "127.0.0.1";
private int port = 5050;

Client() {  
   try {
    client = new Socket(host, port);
   
    InputStream in = client.getInputStream();   
    BufferedReader br = new BufferedReader(new InputStreamReader(in));
   
    String content = br.readLine();   
    System.out.println(content);
   
   } catch(Exception e) {
   
   }
}

public static void main(String[] args) {
   new Client();
}
}