client.java

SSD8的练习一答案

import java.io.*;  
import java.net.*;  
  
  
class Client {  
    // Reader and writer in system 
 static   BufferedReader stdIn = new BufferedReader(new InputStreamReader(  
        System.in));  
  static  PrintWriter stdOut = new PrintWriter(  
        new OutputStreamWriter(System.out), true);  
  
  public static void main(String argv[]) throws Exception {  
     
   //make sure the user enter a single argument.  
     
    if (argv.length != 1) {  
      stdOut.println("Usage: Client <server>");  
      return;  
    }  
  
    // the client socket 
    Socket clientSocket = new Socket(argv[0], 80);  
  
    // Reader and writer between client and server   
    BufferedReader inFromServer = new BufferedReader(new InputStreamReader(  
        clientSocket.getInputStream()));  
    PrintWriter outToServer = new PrintWriter(new OutputStreamWriter(  
        clientSocket.getOutputStream()), true);  
  
    stdOut.println(argv[0] + " is listening to your request:");  
  
 // the command read from user  
    String cmd = "";  
  
  // the response temporarily readed   
    String temp = "";  
  
  // the web information  
    String recieve = "";  
  //html sentencesread from server
    String display = "";  
  
   //the condition whether reading sentences html or web information   
    boolean flag = false;  
  
    cmd = stdIn.readLine();  
  
    outToServer.println(cmd + "\r\n\r\n");  
  
    
    //  Read the response from server and identify the content.  
    
    while (true) {  
      temp = inFromServer.readLine();  
      if (temp == null)  
        break;  
      if (flag == false && temp.length() == 0)  
        flag= true;  
      if (flag == false)  
        display = display + "\n" + temp;  
      else  
        recieve = recieve + "\n" + temp;  
    }  
  
    stdOut.println("Header:\n" + display);  
  
     
      //Output the html sentences into a html file.  
     
    stdOut.print("Enter the name of the file to save:");  
    stdOut.flush();  
  
    cmd = stdIn.readLine();  
  
    PrintWriter fileOut = new PrintWriter(new FileWriter(cmd), true);  
    fileOut.println(recieve);  
  
     
     // Close these reader and writer.  
     fileOut.close();  
    inFromServer.close();  
    outToServer.close();  
    stdIn.close();  
    stdOut.close();  
  
  }  
}