Socket編程例子

 

/*
 * 基於TCP協議的Socket通訊
 * 服務器端
 */
public class Server {
    public static void main(String[] args) {
        try {
            //1.建立一個服務器端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("***服務器即將啓動,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();
                //建立一個新的線程
                ServerThread serverThread=new ServerThread(socket);
                //啓動線程
                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();
        }
    }
}

class ServerThread extends Thread {
    // 和本線程相關的Socket
    Socket socket = null;

    public ServerThread(Socket socket) {
        this.socket = socket;
    }

    //線程執行的操做,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 {
            //獲取輸入流,並讀取客戶端信息
            is = socket.getInputStream();
            isr = new InputStreamReader(is);
            br = new BufferedReader(isr);
            String info=null;
            while((info=br.readLine())!=null){//循環讀取客戶端的信息
                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);
            pw.write("歡迎您!");
            pw.flush();//調用flush()方法將緩衝輸出
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            //關閉資源
            try {
                if(pw!=null)
                    pw.close();
                if(os!=null)
                    os.close();
                if(br!=null)
                    br.close();
                if(isr!=null)
                    isr.close();
                if(is!=null)
                    is.close();
                if(socket!=null)
                    socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}
/*
 * 客戶端
 */
public class Client {
    public static void main(String[] args) {
    	for(int i=0; i<100; i++){
    		new ClientThread(i+1).start();	
    	}
    	
    }
}
class ClientThread extends Thread{
	private int num;
	ClientThread(int num){
		this.num = num;
	}
	public void run(){
		 try {
	            //1.建立客戶端Socket,指定服務器地址和端口
	            Socket socket=new Socket("127.0.0.1", 8888);
	            //2.獲取輸出流,向服務器端發送信息
	            OutputStream os=socket.getOutputStream();//字節輸出流
	            PrintWriter pw=new PrintWriter(os);//將輸出流包裝爲打印流
	            pw.write("我是第" + num + "個用戶");
	            pw.flush();
	            socket.shutdownOutput();//關閉輸出流
	            //3.獲取輸入流,並讀取服務器端的響應信息
	            InputStream is=socket.getInputStream();
	            BufferedReader br=new BufferedReader(new InputStreamReader(is));
	            String info=null;
	            while((info=br.readLine())!=null){
	                System.out.println("我是客戶端,服務器說:"+info);
	            }
	            //4.關閉資源
	            br.close();
	            is.close();
	            pw.close();
	            os.close();
	            socket.close();
	        } catch (UnknownHostException e) {
	            e.printStackTrace();
	        } catch (IOException e) {
	            e.printStackTrace();
	        }
	}
}
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