實現原理

通過能否正常建立socket連接，來判斷端口是否開啟。
輸入需要掃描的端口范圍，通過開啟多線程來實現快速掃描。

代碼實現

package com.it1997;import java.net.InetSocketAddress; import java.net.Socket; import java.util.ArrayList; import java.util.Comparator; import java.util.List; import java.util.concurrent.CountDownLatch;public class PortScaner {public static void main(String[] args) throws InterruptedException {String host = "it1997.com";int startPort =1;int endPort = 10000;int step = Math.round(endPort/500)+1;for(int i=1;i<step;i++){int start = startPort+(i-1)*500;int end = startPort+i*500;System.out.println("正在掃描"+start+"-"+end);SP(host,start,end);}}public static void SP(String host,int startPort,int endPort) throws InterruptedException {List<Integer> portList = new ArrayList<>();final CountDownLatch latch = new CountDownLatch(endPort-startPort+1);for (int port = startPort; port <= endPort; port++) {int finalPort = port;//System.out.println(port);Thread thread = new Thread(new Runnable() {@Overridepublic void run() {Socket socket = new Socket();try {socket.connect(new InetSocketAddress(host, finalPort));System.out.println("端口" + finalPort + "開放");portList.add(finalPort);} catch (Exception e) {//e.printStackTrace();// System.out.println("端口" + finalPort + "未開放");}latch.countDown();}});thread.start();}latch.await();portList.sort(new Comparator<Integer>() {@Overridepublic int compare(Integer o1, Integer o2) {return o1.compareTo(o2);}});} }

總結

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