java实现RSA算法

[afeiluo]

现在要用java实现RSA算法，但是现在公钥是已知的（放到一个文件里，不是通过随机生成的），现在怎么通过java的api来算私钥。
public static void generateKey() throws Exception {
KeyPairGenerator gen = KeyPairGenerator.getInstance(RSA);
gen.initialize(512, new SecureRandom());
KeyPair keyPair = gen.generateKeyPair();
uk = keyPair.getPublic();
rk = keyPair.getPrivate();
}
上面的代码部分的密钥对是随机生成的，现在要根据已知的公钥来生成私钥 ，该怎么弄？

[aimsgmiss]

没看懂

[afeiluo]

[Quote=引用 1 楼 的回复:]

没看懂
[/Quote]
意思就是，不然它随机产生密钥对，通过读文件里面事先准备好的密码 来加密要怎么写.

[aaaabbbccd9876]

没分了。在这问个问题

服务端
import java.net.*;
import java.io.*;
import java.util.*;
class fanserver
{
	static List<fanclient> client = new ArrayList<fanclient>();
	public static void main(String[] args)throws Exception 
	{
		Socket s;
		ServerSocket ss = new ServerSocket(4445);
		while(true){
			s = ss.accept();
			System.out.println("haha...");
			server ser = new server(s);
			new Thread(ser).start();
			client.add(ser);
		}
	/*	BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bwout = 
			new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
		BufferedReader brin = 
			new BufferedReader(new InputStreamReader(s.getInputStream()));
		String str = null;
		while((str=brin.readLine())!=null){
		//	System.out.println(str);
			bwout.write(str);
			bwout.flush();
			bwout.newLine();
		}
		*/
		
	//	s.shutdownOutput();
		
		
	}
}
class server implements Runnable
{
	private Socket s;
	server(Socket s){
		this.s = s;
	}
	public void run(){
		try{
			
			BufferedWriter bwout = 
				new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
			BufferedReader brin = 
				new BufferedReader(new InputStreamReader(s.getInputStream()));
			
			String str = null;
			while((str=brin.readLine())!=null){
				System.out.println(str);
				bwout.write(str);
				bwout.newLine();
				
				bwout.flush();
			}
		//	s.shutdownOutput();
			
		}
		catch(Exception e){}
	}
}

客户端

import java.net.*;
import java.io.*;
class fanclient 
{	

	public static void main(String[] args)throws Exception
	{
		Socket s = new Socket("192.168.30.129",4445);
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bwout = 
			new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
		BufferedReader brin = 
			new BufferedReader(new InputStreamReader(s.getInputStream()));
		new Thread(new client(brin)).start();
		String str = null;
		while((str=br.readLine())!=null){
			
			bwout.write(str);
			
			bwout.newLine();
			bwout.flush();
			
		}
		
	//	s.shutdownOutput();
	
	//	String line = brin.readLine();
	//	System.out.println(line);
	
	
	}
}
class client implements Runnable
{
	private BufferedReader brin;
	client(BufferedReader brin)
	{
		this.brin = brin;
	}
	public void run(){
		String line = null;
		try{
			while((line=brin.readLine())!=null){
				System.out.println(line);	
			}
		}catch(Exception e){}
	}
}

我同时启动好几个客户端，想让客户端通过服无端互相接收到信息，怎么处理，