多线程扫描器java实现

 

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

//java版扫描器实现

/**
 * @author 黎声
 *
 */
public class Scan extends JFrame implements ActionListener{
    JLabel jl1 = new JLabel("IP");
    JLabel jl2 = new JLabel("端口范围");
    JLabel jl3 = new JLabel("-");
    JLabel jl4 = new JLabel("线程数");
    JTextField jtf1 = new JTextField(10);
    JTextField jtf2 = new JTextField(4);
    JTextField jtf3 = new JTextField(4);
    JTextField jtf4 = new JTextField(3);
    JButton jb = new JButton("开始扫描");
    JPanel jp1 = new JPanel();
    JPanel jp2 = new JPanel();
    JTextArea jta = new JTextArea();
    
    //定义线程组对象，方便对多个线程进行管理

    ThreadGroup tg = new ThreadGroup("g1");
    
    public Scan()
    {
        jtf1.setText("127.0.0.1");
        jtf2.setText("0");
        jtf3.setText("10000");
        jtf4.setText("100");
        jta.setEditable(false);
        jp1.add(jl1);
        jp1.add(jtf1);
        jp1.add(jl2);
        jp1.add(jtf2);
        jp1.add(jl3);
        jp1.add(jtf3);
        jp1.add(jl4);
        jp1.add(jtf4);
        jp2.add(jb);
        
        this.add(jp1,BorderLayout.NORTH);
        this.add(new JScrollPane(jta));
        this.add(jp2,BorderLayout.SOUTH);
        
        jb.addActionListener(this);
        
        this.setTitle("扫描器");
        this.setResizable(false);
        this.setSize(500,300);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);
    }
    
    public void actionPerformed(ActionEvent e) {
        
        if(jb.getText().equals("开始扫描"))
        {
            jb.setText("停止扫描");
            jta.setText("");
            SmRunnable.flag = true;
            //启动线程

            int num = Integer.parseInt(jtf4.getText());
            
            for(int i=0;i<num;i++)
            {
                Thread t = new Thread(tg,new SmRunnable(i,this));
                t.start();
            }
            Check t1 = new Check();
            t1.start();
        }
        else
        {
            //点击停止扫描按钮

            jb.setText("开始扫描");
            SmRunnable.flag = false;
            jta.append("用户取消操作! ");
        }
    }
    
    //检查所有用户线程是否结束线程类

    class Check extends Thread
    {
        public void run()
        {
            while(true)
            {
                if(tg.activeCount()==0)
                {
                    jb.setText("开始扫描");
                    jta.append("扫描完毕！");
                    return;
                }
                try {
                    Thread.sleep(10);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    
    public static void main(String[] args) {
        Scan scan = new Scan();
    }

    
}

//扫描线程类

class SmRunnable implements Runnable
{
    int threadno;//线程号

    static int threadnum; //线程数

    static Scan scan;
    static boolean flag = true;
    
    public SmRunnable(int threadno,Scan scan)
    {
        this.threadno = threadno;
        SmRunnable.scan = scan;
    }
    public void run() {
        int min = Integer.parseInt(scan.jtf2.getText());
        int max = Integer.parseInt(scan.jtf3.getText());
        int threadnum = Integer.parseInt(scan.jtf4.getText());
        for(int i=min+threadno;i<max;i+=threadnum)
        {
            try {
                Socket socket = new Socket(scan.jtf1.getText(),i);
                scan.jta.append("ip:"+scan.jtf1.getText()+" 端口"+i+"开放\n");
            }catch (Exception e) {
                //e.printStackTrace();

            }
            
            if(flag==false) break; //停止线程

        }
    }
    
}