网络编程_参考答案

1、编写一服务器端程序，实现读取客户端发送过来的一组整数，表现为一组数与数之间用空格隔开的字符串。对这组整数进行排序处理后，返回相应的字符串给客户端，如果数据格式不正确，则返回错误信息，以本机作为服务器。public class Server public static void main(String args) BufferedReader br = null; String clientStr=; try /创建一个监听的端口ServerSocket ss = new ServerSocket(3838);Socket s = null; System.out.println(服务器启动.);/接受客户端通信请求，并建立专用通信端口 s = ss.accept();System.out.println(有客户端发送请求);Send send = new Send(s);Thread t1 = new Thread(send);t1.start(); while(true) /获取客户端通信的信息 br = new BufferedReader(new InputStreamReader(s.getInputStream(); clientStr = br.readLine(); System.out.println(客户端：+clientStr); catch (IOException e) e.printStackTrace(); public class Client public static void main(String args) BufferedReader br = null; String clientStr=;try /建立通信端口，并向服务器端发送通信请求Socket s = new Socket(127.0.0.1,3838); System.out.println(与服务器端建立连接); Send send = new Send(s);Thread t1 = new Thread(send);t1.start(); while(true) /获取客户端通信的信息 br = new BufferedReader(new InputStreamReader(s.getInputStream(); clientStr = br.readLine(); System.out.println(服务器端说：+clientStr); catch (UnknownHostException e) / TODO Auto-generated catch blocke.printStackTrace(); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace();public class Send implements RunnableSocket s ;Scanner in = new Scanner(System.in);BufferedReader br = new BufferedReader(new InputStreamReader(System.in);public Send(Socket s)this.s = s;public void run() / TODO Auto-generated method stubPrintWriter out = null;try while(true)out = new PrintWriter(new OutputStreamWriter(s.getOutputStream(),true);String str = in.next();/br.readLine(); out.println(str); catch (Exception e) / TODO Auto-generated catch blocke.printStackTrace();finallyout.close();4、编写一个简单的socket通讯程序： 1）、客户机程序，从控制台输入字符串，发送到服务器端，并将服务器返回的信息显示出来。2)、服务器端程序，从客户机接收数据并打印，同时将从标准输入获取的信息发送给客户机3）、满足一个服务器可以服务多个客户实现效果如图：图1：服务器端效果：图2：客户器端效果：public class Server static List l = new ArrayList();public static void main(String args) try ServerSocket so =new ServerSocket(4001);System.out.println(服务器启动.);while(true)Socket s = so.accept();System.out.println(s.getInetAddress()+发送请求);l.add(s);One o = new One();Thread t = new Thread(o);t.start(); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace();public class One implements Runnable public void run() Socket s = Server.l.get(Server.l.size() - 1);String str = ;SendAll sendAll = new SendAll();Thread t1 = new Thread(sendAll);t1.start();try while (true) BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream();str = br.readLine();System.out.println(客户端 + s.getInetAddress() + 说： + str); catch (IOException e) / TODO Auto-generated catch blockSystem.out.println(s.getInetAddress() + 用户下线);Server.l.remove(s);public class SendAll implements RunnableScanner in = new Scanner(System.in);BufferedReader br = new BufferedReader(new InputStreamReader(System.in);public void run()PrintWriter out = null;try while(true)String str =br.readLine();for(Socket s:Server.l)out = new PrintWriter(new OutputStreamWriter(s.getOutputStream(),true); out.println(str); catch (Exception e) / TODO Auto-generated catch blocke.printStackTrace();finallyout.close();public class Client public static void main(String args) BufferedReader br = null; String clientStr=;try /建立通信端口，并向服务器端发送通信请求Socket s = new Socket(127.0.0.1,4001); System.out.println(与服务器端建立连接); Send send = new Send(s);Thread t1 = new Thread(send);t1.start(); while(true) /获取客户端通信的信息 br = new BufferedReader(new InputStreamReader(s.getInputStream(); clientStr = br.readLine(); System.out.println(服务器端说：+clientStr); catch (UnknownHostException e) / TODO Auto-generated catch blocke.printStackTrace(); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace();public class Send implements RunnableSocket s ;Scanner in = new Scanner(System.in);BufferedReader br = new BufferedReader(new InputStreamReader(System.in);public Send(Socket s)this.s = s;public void run() / TODO Auto-generated method stubPrintWriter out = null;try while(tru