Socket通常也稱做”套接字“，用于描述IP地址和端口，廢話不多說，它就是網(wǎng)絡(luò)通信過程中端點(diǎn)的抽象表示。值得一提的是，Java在包java.net中提供了兩個(gè)類Socket和ServerSocket，分別用來表示雙向連接的客戶端和服務(wù)端。這是兩個(gè)封裝得非常好的類，使用起來很方便！
下面將首先創(chuàng)建一個(gè)SocketServer的類作為服務(wù)端如下，該服務(wù)端實(shí)現(xiàn)了多線程機(jī)制，可以在特定端口處監(jiān)聽多個(gè)客戶請(qǐng)求，一旦有客戶請(qǐng)求，Server總是會(huì)創(chuàng)建一個(gè)服務(wù)純種來服務(wù)新來的客戶，而自己繼續(xù)監(jiān)聽。程序中accept()是一個(gè)阻塞函數(shù)，所謂阻塞性方法就是說該方法被調(diào)用后將等待客戶的請(qǐng)求，直到有一個(gè)客戶啟動(dòng)并請(qǐng)求連接到相同的端口，然后accept()返回一個(gè)對(duì)應(yīng)于客戶的Socket。這時(shí)，客戶方和服務(wù)方都建立了用于通信的Socket，接下來就是由各個(gè)Socket分別打開各自的輸入、輸出流。
1 package HA.Socket;
2
3 import java.io.*;
4 import java.net.*;
5
6 public class SocketServer {
7
8 ServerSocket sever;
9
10 public SocketServer(int port){
11 try{
12 sever = new ServerSocket(port);
13 }catch(IOException e){
14 e.printStackTrace();
15 }
16 }
17
18 public void beginListen(){
19 while(true){
20 try{
21 final Socket socket = sever.accept();
22
23 new Thread(new Runnable(){
24 public void run(){
25 BufferedReader in;
26 try{
27 in = new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF-8"));
28 PrintWriter out = new PrintWriter(socket.getOutputStream());
29 while (!socket.isClosed()){
30 String str;
31 str = in.readLine();
32 out.println("Hello!world!! " + str);
33 out.flush();
34 if (str == null || str.equals("end"))
35 break;
36 System.out.println(str);
37 }
38 socket.close();
39 }catch(IOException e){
40 e.printStackTrace();
41 }
42 }
43 }).start();
44 }catch(IOException e){
45 e.printStackTrace();
46 }
47 }
48 }
49 }
1 package HA.Socket;
2
3 import java.io.*;
4 import java.net.*;
5
6 public class SocketClient {
7 static Socket client;
8
9 public SocketClient(String site, int port){
10 try{
11 client = new Socket(site,port);
12 System.out.println("Client is created! site:"+site+" port:"+port);
13 }catch (UnknownHostException e){
14 e.printStackTrace();
15 }catch (IOException e){
16 e.printStackTrace();
17 }
18 }
19
20 public String sendMsg(String msg){
21 try{
22 BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
23 PrintWriter out = new PrintWriter(client.getOutputStream());
24 out.println(msg);
25 out.flush();
26 return in.readLine();
27 }catch(IOException e){
28 e.printStackTrace();
29 }
30 return "";
31 }
32 public void closeSocket(){
33 try{
34 client.close();
35 }catch(IOException e){
36 e.printStackTrace();
37 }
38 }
39 public static void main(String[] args) throws Exception{
40
41 }
42
43 }
接下來就是來測(cè)試Socket通信了！
先運(yùn)行TestSocketServer類，打開服務(wù)端，在12345端口處監(jiān)聽！
1 package HA.Socket;
2
3 public class TestSocketServer {
4
5 public static void main(String[] argvs){
6 SocketServer server = new SocketServer(12345);
7 server.beginListen();
8 }
9 }
再運(yùn)行TestSocketClient類：
1 package HA.Socket;
2
3 public class TestSocketClient {
4
5 public static void main(String[] args){
6
7 SocketClient client = new SocketClient("127.0.0.1",12345);
8 System.out.println(client.sendMsg("nimei1"));
9 client.closeSocket();
10
11 SocketClient client1 = new SocketClient("127.0.0.1",12345);
12 System.out.println(client1.sendMsg("nimei1111"));
13 client1.closeSocket();
14
15 SocketClient client11 = new SocketClient("127.0.0.1",12345);
16 System.out.println(client11.sendMsg("nimei11111111"));
17 client11.closeSocket();
18
19 SocketClient client111 = new SocketClient("127.0.0.1",12345);
20 System.out.println(client111.sendMsg("nimei11111111111111111"));
21 client111.closeSocket();
22
23 }
24 }
輸出結(jié)果如下：
服務(wù)端：
Client is created! site:127.0.0.1 port:12345
Hello!world!! nimei1
Client is created! site:127.0.0.1 port:12345
Hello!world!! nimei1111
Client is created! site:127.0.0.1 port:12345
Hello!world!! nimei11111111
Client is created! site:127.0.0.1 port:12345
Hello!world!! nimei11111111111111111
客戶端：
nimei1
nimei1111
nimei11111111
nimei11111111111111111
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