Java Socket進行客戶端和服務器進行通信的簡單例子

這是一個使用Java Socket 進行客戶端和服務器進行通信的簡單例子。

有些考試裏頭會讓寫這方面的程序，自己動手寫寫，掌握這個實現過程。理解之後，很快就能寫出來了。

而且這個題目值 10 分。

 

服務器端代碼：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){
    //獲得客戶端連接
     client = server.accept();
     //獲得客戶端的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();
    
     //獲得 client 端的輸入輸出流，爲進行交互做準備
     in = new BufferedReader(new InputStreamReader(client.getInputStream()));
     out = new PrintWriter(client.getOutputStream(),true);
    
     //獲得 client 端發送的數據
     String content = in.readLine();   
     System.out.println("Client message is: " + content);
    
    // 向 client 端發送響應數據
     out.println("Your message has been received successfully.");
    
     //關閉各個流
     out.close();
     in.close();
     server.close();   
    }
   }catch(Exception e){
   // 發送響應，接收失敗
    out.println("Receive Error!");
   }
}

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

[CODE]

                         

 

 

 

客戶端代碼：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{
   //連接 server 端
    System.out.println("Try connect to server ...");
    client = new Socket(serverAddress,port);
   
   //顯示已連接
    System.out.println("Conntected to Server.");
    System.out.println();
   
   //爲發送數據做準備
    System.out.println("Enter some characters:");
    in = new BufferedReader(new InputStreamReader(System.in));
    out = new PrintWriter(client.getOutputStream(),true);
   
   // 向 server 發送數據
    out.println(in.readLine() + "/n");
    System.out.println();
   
   //接收來自 server 的響應數據
    in = new BufferedReader(new InputStreamReader(client.getInputStream()));
    System.out.println("Message from server: " + in.readLine());
   
   // 關閉各個流
    in.close();
    out.close();
    client.close();

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

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

[CODE]

                         

 

 

 

打開兩個終端：

終端一：
javac Server.java
java Server

終端二：
javac Client.java
java Client

即可看到運行結果。

                         

 

 

 

附加一個更加簡單的例子， client 端只接收來自 server 端的消息並顯示。

服務器端代碼：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]

                         

 

 

 

客戶端代碼：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();
}
}