java网络编程2

简单聊天程序（基于UDP协议）

对等端甲

package cn.point;

import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class project extends JFrame implements Runnable,ActionListener{
	JTextField out_message=new JTextField(6);
	JTextField one=new JTextField(3);
	JTextField two=new JTextField(3);
	JTextField three=new JTextField(3);
	JButton submit=new JButton("submit");
	JTextArea in_message=new JTextArea();
	JButton send=new JButton("发送");
	project(){
		this.setTitle("甲方");
		this.setSize(230,125);
		this.setVisible(true);
		send.addActionListener(this);
		JPanel pSouth=new JPanel();
		pSouth.add(out_message);
		pSouth.add(send);
		this.add(pSouth,"South");
		JPanel pCenter=new JPanel();
		pCenter.add(one);
		pCenter.add(two);
		pCenter.add(three);
		pCenter.add(submit);
		this.add(pCenter,"Center");
		this.add(new JScrollPane(in_message),"North");
		this.validate();
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Thread thread=new Thread(this);
		thread.start();
	}
	public float powfunction(int data,int e,int n)
	{
		int temp=data;
		for(int k=1;k<e;k++)
		{
			data=temp*data;
			data=data%n;
		}
		return data;
	}
	public void actionPerformed(ActionEvent event){                //监听器，监听事件，主要用于处理数据发送部分
		char getdata[]=this.out_message.getText().toCharArray();
		
		
		
		int p=17,q=7;
		 int n=119,o=96;
		 int d=77,e=5;
		 //cout<<"请输入要加密的信息（*结束，无标点）："<<endl;
		 int m1[] = new int[16];
		 float m2[] = new float[16];
		 int j;
		 //char data;
		 for(j=0;j<500;j++)
		 {
		  //cin>>data;
		  m1[j]=getdata[j]-(int)'a';
		     if(getdata[j]=='*')
		      break;
		     m2[j]=powfunction(m1[j],e,n);                     //通过调用这个函数防止使用pow数学库函数产生的溢出,加密过程
		 }
		 //cout<<"密文为："<<endl;
		 int k;
		 String mess = new String();
		 for(k=0;k<j;k++)
			 mess+=m2[k];
		 System.out.println("密文为："+mess);
		 //cout<<m2[k]<<" ";
		 //cout<<endl;
		 //cout<<"明文为："<<endl;
		 String mess1 = new String();
		 for(k=0;k<j;k++)
		 {
		     m2[k]=powfunction((int)m2[k],d,n);
		     mess1+=(char)(m2[k]+(int)'a');
		 }
		 System.out.println("明文为："+mess1);
		
		
		
		
		
		//byte buffer[]=out_message.getText().trim().getBytes();
		 byte buffer[]=mess.getBytes();
		try{
			InetAddress address=InetAddress.getByName("127.0.0.1");
			DatagramPacket data_pack=new DatagramPacket(buffer,buffer.length,address,666);
			DatagramSocket mail_data=new DatagramSocket();
			mail_data.send(data_pack);
		}catch(Exception e1){}
		this.out_message.setText("");
	}
	public void run(){                                  //线程，主要用于接收发送过来的数据
		DatagramPacket pack=null;
		DatagramSocket mail_data=null;
		byte data[]=new byte[8192];
		try{
			pack=new DatagramPacket(data,data.length);
			mail_data=new DatagramSocket(888);
		}catch(Exception e){}
		while(true){
			if(mail_data==null)break;
			else
				try{
					mail_data.receive(pack);
					String message=new String(pack.getData(),0,pack.getLength());
					in_message.append("收到数据："+message+"\n");
				}catch(Exception e){}
		}
	}
}

package cn.point;

public class main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		project myproject=new project();
	}

}

对等端乙：

package cn.point;

import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class project extends JFrame implements Runnable,ActionListener{
	JTextField out_message=new JTextField(6);
	JTextArea in_message=new JTextArea();
	JButton send=new JButton("发送");
	project(){
		this.setTitle("乙方");
		this.setSize(230,150);
		this.setVisible(true);
		send.addActionListener(this);
		JPanel pSouth=new JPanel();
		pSouth.add(out_message);
		pSouth.add(send);
		this.add(pSouth,"South");
		this.add(new JScrollPane(in_message),"Center");
		this.validate();
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Thread thread=new Thread(this);
		thread.start();
	}
	public void actionPerformed(ActionEvent event){
		byte buffer[]=out_message.getText().trim().getBytes();
		try{
			InetAddress address=InetAddress.getByName("127.0.0.1");
			DatagramPacket data_pack=new DatagramPacket(buffer,buffer.length,address,888);
			DatagramSocket mail_data=new DatagramSocket();
			mail_data.send(data_pack);
		}catch(Exception e){}
		this.out_message.setText("");
	}
	public void run(){
		DatagramPacket pack=null;
		DatagramSocket mail_data=null;
		byte data[]=new byte[8192];
		try{
			pack=new DatagramPacket(data,data.length);
			mail_data=new DatagramSocket(666);
		}catch(Exception e){}
		while(true){
			if(mail_data==null)break;
			else
				try{
					mail_data.receive(pack);
					String message=new String(pack.getData(),0,pack.getLength());
					in_message.append("收到数据："+message+"\n");
				}catch(Exception e){}
		}
	}
}

package cn.point;

public class main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		project myproject=new project();
	}

}

　实验结果：