Java网络编程实现的简单端口扫描器示例

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class ScanPort extends JFrame {
 /**
  * 端口扫描启动主程序
  */
 private static final long serialVersiOnUID= 1L;
 String str1 = " 常见端口有:";
 String str2 = "ftp:21,22,telnet:23,smtp:25,http:80";
 String str3 = "dns:53,tftp:69,snmp:161,162";
 String str4 = "1158,1433,1521,2100,3128,26,69";
 String str5 = "3306,3389,7001,8080,8081,110,143";
 String str6 = "9080,9090,43958,443,465,995,1080";
 JButton jb1 = new JButton("strat");
 JTextArea jta = new JTextArea();
 JScrollPane jsp = new JScrollPane(jta);
 JTextField jtf = new JTextField(17);
 String IP = "";//待扫描IP或域名
 List portList = new LinkedList();// 定义一个List容器表示扫描的团口的List集合
 Integer[] ports = new Integer[] { 21, 22, 23, 25, 26, 53,69, 80, 110, 143,
   443,465,69,161,162,135,995,1080,1158,1433,1521,2100, 3128, 3306, 3389,
   7001, 8080, 8081, 9080, 9090, 43958 ,135,445,1025,1026,1027,1028,1055,5357};
 // 常见端口集合
 public ScanPort() {
  this.add(getPanel(), BorderLayout.SOUTH);
  jsp.setBorder(BorderFactory.createEtchedBorder());
  jsp.setBackground(Color.cyan);
  this.add(jsp, BorderLayout.CENTER);
  this.add(getPanel2(), BorderLayout.NORTH);
  this.add(getPanel3(), BorderLayout.WEST);
  this.setBounds(300, 60, 600, 600);
  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  this.setTitle("ScanPort");
  jta.setTabSize(4);
  jta.setFont(new Font("标楷体", Font.BOLD, 16));
  jta.setLineWrap(true);// 激活自动换行功能
  jta.setWrapStyleWord(true);// 激活断行不断字功能
  portList.addAll(Arrays.asList(ports));
  //将ports中的值加入到set中，并去掉重复的
  jb1.addActionListener(new ActionListener() {
   @Override
   public void actionPerformed(ActionEvent e) {
    // TODO Auto-generated method stub
    IP = jta.getText();
    //ip为文本框内输入的字符串
    scanPorts(IP, portList, 10, 800);
    //超时时间设定为800，线程数设定为10
   }
  });
  this.setVisible(true);
 }
 /**
  * 多线程扫描目标主机指定List端口集合的开放情况
  *
  * @param ip
  *   待扫描IP或域名
  * @param portList
  *   待扫描的端口的List集合
  * @param threadNumber
  *   线程数
  * @param timeout
  *   连接超时时间
  * */
 public void scanPorts(String ip, List portSet,int threadNumber, int timeout) {
  ExecutorService threadPool = Executors.newCachedThreadPool();
  //线程池
  for (int i = 0; i  portList; // 待扫描的端口的List集合
  private int threadNumber, serial, timeout; // 线程数，这是第几个线程，超时时间
  public ScanMethod(String ip, List portList, int threadNumber,int serial, int timeout) {
   this.ip = ip;
   this.portList = portList;
   this.threadNumber = threadNumber;
   this.serial = serial;
   this.timeout = timeout;
  }
  public void run() {
   int port = 0;
   Integer[] ports = portList.toArray(new Integer[portList.size()]); // List转数组
   try {
    InetAddress address = InetAddress.getByName(ip); //如果输入的是主机名，尝试获取ip地址
    Socket socket;//定义套接字
    SocketAddress socketAddress;//传递ip和端口
    if (ports.length <1)
     //若数组没有元素，返回，不执行
     return;
    for (port = 0 + serial; port <= ports.length - 1; port += threadNumber) {
     //每次运行10个线程
     socket = new Socket();
     //为对象分配内存空间
     socketAddress = new InetSocketAddress(address, ports[port]);
     try {
      socket.connect(socketAddress, timeout);
      //对目标主机的指定端口进行连接，超时后连接失败
      socket.close();
      //关闭端口
      System.out.println("端口 " + ports[port] + " ：开放");
      jta.append("端口 " + ports[port] + " ：开放\n");
      //在文本区域里更新消息
     } catch (IOException e) {
      System.out.println("端口 " + ports[port] + " ：关闭");
      jta.append("端口 " + ports[port] + " ：关闭\n");
      //产生异常表示端口关闭
     }
    }
   } catch (UnknownHostException e) {
    e.printStackTrace();
   }
  }
  //end of run()
 }//end of ScanMethod
 public JPanel getPanel() {
  JPanel jp = new JPanel();
  jp.add(jb1, BorderLayout.CENTER);
  jp.setBorder(BorderFactory.createRaisedBevelBorder());
  jp.setBackground(Color.lightGray);
  return jp;
 }
 public JPanel getPanel2() {
  JPanel jp = new JPanel();
  JLabel jl = new JLabel();
  jl.setText("请输入主机名或ip地址，将扫描该主机的常见端口号：");
  jp.add(jl);
  jp.add(jtf);
  jp.setBorder(BorderFactory.createRaisedBevelBorder());
  jp.setBackground(Color.LIGHT_GRAY);
  return jp;
 }
 public JPanel getPanel3() {
  JLabel jl1 = new JLabel(str1);
  JLabel jl2 = new JLabel(str2);
  JLabel jl3 = new JLabel(str3);
  JLabel jl4 = new JLabel(str4);
  JLabel jl5 = new JLabel(str5);
  JLabel jl6 = new JLabel(str6);
  JPanel jp = new JPanel();
  jp.setLayout(new GridLayout(6, 1));
  jp.add(jl1);
  jp.add(jl2);
  jp.add(jl3);
  jp.add(jl4);
  jp.add(jl5);
  jp.add(jl6);
  jp.setBorder(BorderFactory.createEtchedBorder());
  //蚀刻边框
  return jp;
 }
 public static void main(String[] args) {
  new ScanPort();
 }
}