服务器端与客户端的编程

import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.Socket;import java.util.Scanner;public class ClientDemo {  public static void main(String[] args)     throws IOException {    ClientDemo client = new ClientDemo();    client.open();  }  public void open() throws IOException{    //new Socket(host, port)会发起tcp连接,连接到host:port    //如果连接成功, 会创建实例s, 如果连接失败会抛出IO异常.     //new Socket(host, port)成功, 服务器accept() 也同时    //执行成功,结束IO Block, 并且返回服务器端Socket实例s     Socket s = new Socket("localhost", 8888);    //客户端的in 连接到服务的out    InputStream in = s.getInputStream();    //客户端的out连接到服务器的in    OutputStream out = s.getOutputStream();    //Reader线程负责: 从控制台读取信息写入到服务器端in    new Reader(out).start();    //Writer线程负责: 从服务器读in取信息显示到控制台.    new Writer(in).start();  }//Reader线程负责: 从控制台读取信息写入到服务器端in  private class Reader extends Thread{    OutputStream out;    public Reader(OutputStream out ) {      this.out = out;    }    public void run(){      Scanner console = new Scanner(System.in);      while(true){        try{          String str = console.nextLine();          out.write((str+"\n").getBytes());          out.flush();          if(str.startsWith("bye")){            break;          }        }catch(IOException e){          e.printStackTrace();          break;        }      }    }  }//Writer线程负责: 从服务器读in取信息显示到控制台.  private class Writer extends Thread{    InputStream in;    public Writer(InputStream in) {      this.in = in;      setDaemon(true);    }    public void run(){      try{        int b;         while((b = in.read())!=-1){          System.out.write(b);        }      }catch(IOException e){        e.printStackTrace();      }    }  }}

服务器端

import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.PrintWriter;import java.net.ServerSocket;import java.net.Socket;import java.util.Scanner;/** TCP 服务器原型演示 */public class ServerDemo {  public static void main(String[] args)     throws IOException {    ServerDemo server = new ServerDemo();    server.start();  }  public void start() throws IOException{    //利用ServerSocket绑定当前主机(Host)的服务端口    //将占用8888端口提供服务, 端口不能重复占用(绑定)     //端口号: 0~65535, 1K 以下留给系统使用.    //如果绑定失败或抛出异常, 绑定成功就创建了对象ss    ServerSocket ss = new ServerSocket(8888);    while(true){      //ss.accept()是开始等待对8888端口的监听      //ss.accept()是IO Block方法, 等待客户端的连接      //如果有客户端连接进来, IO就完成, 结束Block      //返回一个Socket实例s,代表对客户端的连接s中包含(in,out)      //in 代表客户端到服务器的流, out代表服务器到客户端的流      Socket s = ss.accept();      //启动客户端服务线程, 处理这个客户的请求和响应      new Service(s).start();    }      }    class Service extends Thread{    Socket s;    public Service(Socket s) {      this.s = s;    }    public void run(){      try{//telnet ip port  /sbin/ifconfig        InputStream in = s.getInputStream();        OutputStream out = s.getOutputStream();        Scanner s = new Scanner(in);        out.write("你要点啥?\n".getBytes());        out.flush();        while(true){          String str = s.nextLine();          if(str.equals("鱼丸")){            out.write("木有啊?\n".getBytes());            out.flush();          }else if(str.startsWith("bye")){            out.write("亲,再见呀?\n".getBytes());            out.flush();  this.s.close();  break;          }        }      }catch(IOException e){        e.printStackTrace();        throw new RuntimeException(e);       }    }  }  }