client.java

SSD8 EXERCISE 1 服务器代码 JAVA编写

import java.io.*;
import java.net.*;

public class Client {
    //the client socket used to connect to server
	private Socket clientSocket;
	//read the user input from keyboard
	BufferedReader inFromKeyBoard;
	//get the information response by the server
	BufferedReader inFromServer;
	//send the user input to the sever 
	DataOutputStream outToServer;
	public Client(){
		
		this.clientSocket=null;
	}
	
	//connect to the server 
	public void connect(String host,int port){
		try{
			this.clientSocket=new Socket(host,port);
			//read from keyboard
			this.inFromKeyBoard=new BufferedReader
			                   (new InputStreamReader(System.in));
			//read from the client socket
			this.inFromServer=new BufferedReader
			                   (new InputStreamReader(clientSocket.getInputStream()));
			//output to server socket
			this.outToServer=new DataOutputStream
			                   (clientSocket.getOutputStream() );
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	public void close(){
		try{
			//close the socket
			this.clientSocket.close();
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	
	public static void main(String [] args) throws Exception{
		if(args.length!=1){
			System.out.println("Usage: Client <server>");
			System.exit(0);
		}
		else{
			try{
			final int port=80;
			Client client=new Client();
			//connnect to the user defined host(argv[0]) use port 80
			client.connect(args[0], port);
			System.out.println(args[0] + " is listening to you request:");
			//read the user input from keyboard assign to s
			String s=client.inFromKeyBoard.readLine();
			s+="\r\n" + "\r\n";
		
			//send s to server
			client.outToServer.writeBytes(s);
			
			//get the response header and show to the user
			String file="";
			String temp=file;
			int i=0;
			boolean flag=true;
			for(int j=0; flag&&((j=client.inFromServer.read())!=-1);){
				switch(j)
	            {
	            case 13: // '\r'
	                break;

	            case 10: // '\n'
	                if(j == i)
	                {
	                    flag = false;
	                } else
	                {
	                    i = j;
	                    file+="\r\n";
	                }
	                break;

	            default:
	                i = j;
	            file+=(char)j;
	                break;
	            }
			}
			System.out.println("Header:");
			System.out.println("");
			System.out.println(file);
			file="";
			temp=client.inFromServer.readLine();
			//get the response context
			while(temp!=null){
				
				file=file + "\r\n"+temp;
				temp=client.inFromServer.readLine();
			}
            // save the response text to a file
			System.out.println("Enter the name of the file to save: ");
			String name=client.inFromKeyBoard.readLine();
			FileOutputStream filename=new FileOutputStream(name);
			filename.write(file.getBytes());
			filename.flush();
			filename.close();
			client.close();
			}catch(Exception e)
			{
				e.printStackTrace();
			}
		}
	}
}