io流+网络+线程池 实现简单的多客户端与服务器端通信
1 import java.io.IOException; 2 import java.io.InputStream; 3 import java.io.OutputStream; 4 import java.net.Socket; 5 import java.util.Scanner; 6 //客户端要做的事就是 读出服务器端输出的信息，将要说的话写到服务器端 7 public class Client { 8 public static void main(String[] args) { 9 Socket client = null; 10 OutputStream os =null; 11 InputStream is = null; 12 Scanner sc= new Scanner(System.in); 13 14 try { 15 client= new Socket("127.0.0.1",5000); 16 String address = client.getInetAddress().getHostAddress(); 17 is = client.getInputStream(); 18 int len=0; 19 byte []b = new byte[1024]; 20 len=is.read(b, 0, b.length); 21 System.out.println(new String(b,0,len)); 22 os = client.getOutputStream(); 23 String sendMsg=sc.next(); 24 os.write(sendMsg.getBytes()); 25 while(true) { 26 len=is.read(b, 0, b.length); 27 String msg = new String(b,0,len); 28 System.out.println(msg); 29 String send = sc.next(); 30 os.write(send.getBytes()); 31 os.flush(); 32 if(send.contains("bye")) //判断写出的字符串中是否包含bye 包含则退出 33 { 34 break; 35 } 36 } 37 38 } catch (Exception e) { 39 e.printStackTrace(); 40 }finally { 41 try { 42 is.close(); 43 os.close(); 44 client.close(); 45 } catch (IOException e) { 46 // TODO Auto-generated catch block 47 e.printStackTrace(); 48 } 49 } 50 } 51 }
1 import java.io.IOException; 2 import java.io.InputStream; 3 import java.io.OutputStream; 4 import java.net.ServerSocket; 5 import java.net.Socket; 6 import java.util.Scanner; 7 import java.util.concurrent.ExecutorService; 8 import java.util.concurrent.Executors; 9 //服务器端接收多个客户端的连接 并处理每个连接要做的事情 10 public class Server { 11 public static ServerSocket server; 12 public static Socket client;
//静态代码块只执行一次 跟随类加载
//非静态匿名代码块 每次都跟随对象加载
13 static { 14 try { 15 server = new ServerSocket(5000); 16 System.out.println("服务器端已经创建，开放端口为5000"); 17 } catch (IOException e) { 18 // TODO Auto-generated catch block 19 e.printStackTrace(); 20 } 21 }
//使用的线程池是newCachedThreadPool 22 public static void main(String[] args) { 23 ExecutorService exe = Executors.newCachedThreadPool(); 24 while(true) { 25 try { 26 client= server.accept(); 27 exe.execute(new SocketThread(client)); 28 29 30 } catch (IOException e) { 31 // TODO Auto-generated catch block 32 e.printStackTrace(); 33 } 34 } 35 } 36 37 } 38 class SocketThread extends Thread { 39 Scanner sc= new Scanner(System.in); 40 private Socket s = null; 41 private InputStream is= null; 42 private OutputStream os= null; 43 public SocketThread(Socket s) { 44 this.s = s ; 45 46 } 47 @Override 48 public void run() { 49 try { 50 os = s.getOutputStream(); 51 os.write("你好 请输入你的名字".getBytes()); 52 os.flush(); 53 is=s.getInputStream(); 54 byte []b = new byte[1024]; 55 int len=is.read(b, 0, b.length); 56 //为线程设置名字 57 setName(new String (b,0,len)); 58 os.write("恭喜设置昵称成功，我们开始聊天吧".getBytes()); 59 os.flush(); 60 while(true) { 61 len=is.read(b, 0, b.length); 62 String msg = new String(b,0,len); 63 if(msg.contains("bye")) { 64 break; 65 } 66 System.out.println(getName()+":"+msg); 67 String send =sc.next(); 68 os.write(send.getBytes()); 69 os.flush(); 70 71 } 72 73 } catch (Exception e) { 74 // TODO: handle exception 75 } 76 finally { 77 try { 78 os.close(); 79 is.close(); 80 s.close(); 81 } catch (IOException e) { 82 // TODO Auto-generated catch block 83 e.printStackTrace(); 84 } 85 } 86 } 87 }
