server.java

用ＪＡＶＡ开发的网络通信程序

import java.io.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.net.*;
public class server{
  public static void main(String args[])throws Exception{
  
	ServerSocket server=null;
	Socket you=null;
	while(true){
		try{server=new ServerSocket(2345);}
		catch(IOException e){}
		try{
			you=server.accept();
			}
		catch(IOException ee){}
		if(you!=null){
			new Server_thread(you).start();
			FileInputStream fin=new FileInputStream("c:/deskey.dat");
	ObjectInputStream ob=new ObjectInputStream(fin);
	Key k=(Key)ob.readObject();
	Cipher cp=Cipher.getInstance("DESede"); 
	cp.init(Cipher.DECRYPT_MODE,k);
	FileInputStream fin2=new FileInputStream("c:/desencryp.txt");
  FileOutputStream fout2=new FileOutputStream("c:/clear.txt");
	CipherOutputStream cout=new CipherOutputStream(fout2,cp);
	int b=0;
	while((b=fin2.read())!=-1){
	  cout.write(b);
	}
	cout.close();
	fout2.close();
	fin2.close();
			}
		else {continue;}	
		}
	}
}
class Server_thread extends Thread {
	Socket socket1=null;
	DataInputStream in1=null;
	DataOutputStream out1=null;
	Server_thread(Socket t){
		socket1=t;
		try{
			in1=new DataInputStream (socket1.getInputStream());
			out1=new DataOutputStream (socket1.getOutputStream());
			}
		catch(IOException e){}
		}
	public void run(){
		while(true){
			String s=null;
			String content=null;
			try{
				s=in1.readUTF();
				if(s.startsWith("miyao:")){
					content=s.substring(s.indexOf(":")+1);
						PrintWriter out2=new PrintWriter(new FileWriter("f:/getdes.txt"));
						out2.print(content);
				    out2.close(); 
					}	
			  else if(s.startsWith("jiami:")){
					content=s.substring(s.indexOf(":")+1);
						PrintWriter out2=new PrintWriter(new FileWriter("f:/getcontent.txt"));
						out2.print(content);
				    out2.close(); 
					}	
						
				}
			catch (IOException e){}	
			try{socket1.close();}
			catch (Exception e){}	
			break;
			}
		
		}	
	}