應用Java多線程實現服務器端與多客戶端之間的通信

應用Java多線程來實現服務器與多線程之間的通信的基本步驟

1、服務器端創建ServerSocket,循環調用accept()等待客戶端鏈接

2、客戶端創建一個Socket並請求和服務器端鏈接

3、服務器端接受客戶端請求，創建socekt與該客戶端建立專線鏈接

4、建立鏈接的socket在一個單獨的線程上對話

5、服務器繼續等待新的鏈接

服務器端Server.java

package test.concurrent.socket;

import java.io.*;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

/**
* Created by dong on 15-6-22.
* 基於TCP協議的Socket通信，實現用戶登錄
* 服務器端
*/
public class Server {

public static void main(String[] args) {

try {
//1、創建一個服務器端Socket,即ServerSocket, 指定綁定的端口，並監聽此端口
ServerSocket serverSocket = new ServerSocket(8888);
Socket socket = null;
//記錄客戶端的數量
int count = 0;
System.out.println("***服務器即將啟動，等待客戶端的鏈接***");
//循環監聽等待客戶端的鏈接
while (true){
//調用accept()方法開始監聽，等待客戶端的鏈接
socket = serverSocket.accept();
//創建一個新的線程
ServerThread serverThread = new ServerThread(socket);
//啟動線程
serverThread.start();

count++; //統計客戶端的數量
System.out.println("客戶端的數量: " + count);
InetAddress address = socket.getInetAddress();
System.out.println("當前客戶端的IP ： " + address.getHostAddress());
}

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

服務器端線程處理類ServerThread.java

package test.concurrent.socket;

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

/**
* Created by dong on 15-6-22.
* 服務器端線程處理類
*/
public class ServerThread extends Thread {

//和本線程相關的Socket
Socket socket = null;
public ServerThread(Socket socket){
this.socket = socket;
}

//線程執行的操作，響應客戶端的請求
public void run(){

InputStream is = null;
InputStreamReader isr = null;
BufferedReader br = null;

OutputStream os = null;
PrintWriter pw = null;
try {

//獲取一個輸入流，並讀取客戶端的信息
is = socket.getInputStream();
isr = new InputStreamReader(is); //將字節流轉化為字符流
br = new BufferedReader(isr); //添加緩沖
String info = null;
//循環讀取數據
while ((info = br.readLine()) != null){
System.out.println("我是服務器，客戶端說: " +info);
}

socket.shutdownInput(); //關閉輸入流

//獲取輸出流，響應客戶端的請求
os = socket.getOutputStream();
pw = new PrintWriter(os); //包裝為打印流
pw.write("歡迎你");
pw.flush(); //將緩存輸出

} catch (IOException e) {
e.printStackTrace();
}finally {

try {
//關閉資源
if (pw != null)
pw.close();
if (os != null)
os.close();
if (is != null)
is.close();
if (isr != null)
isr.close();
if (br != null)
br.close();
if (socket != null)
socket.close();
} catch (IOException e) {
e.printStackTrace();

}

}

}
}

客戶端Client.java

package test.concurrent.socket;

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

/**
* Created by dong on 15-6-22.
* 客戶端
*/
public class Client {

public static void main(String[] args) {

try {
//1、創建客戶端Socket，指定服務器端口號和地址
Socket socket = new Socket("localhost",8888);
//2、獲取輸出流,向服務器發送信息
OutputStream os = socket.getOutputStream(); //字節輸出流
PrintWriter pw = new PrintWriter(os); //將輸出流包裝為打印流
pw.write("用戶名:tom; 密碼：456");
pw.flush();
socket.shutdownOutput(); //關閉輸出流

InputStream is = socket.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);

String info = null;
//循環讀取
while ((info = br.readLine()) != null){
System.out.println("我是客戶端:服務器說:" + info);
}

br.close();
is.close();
isr.close();

pw.close();
os.close();
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}