一个小程序，内存分析求助？

「已注销」 2014-09-10 03:17:19

加精

写了一个端口扫描程序，运行没问题，但是我发现刚开始几分钟，内存运行都很正常，堆内新生代累计到16M就转义到了Survivor区，然后被回收掉，图形成折线，但是一旦过了大约两分钟，Heap里面新生代大部分就开始不回收了，好像直接就扔到了Old Gen，不知道这是为什么，下面附上程序和截图
程序：

package com.demo.net;



import java.io.IOException;

import java.net.InetAddress;

import java.net.Socket;

import java.util.concurrent.*;



/**

 * Created by louis on 2014/9/9.

 */

public class PortScanner {

    private int corePoolSize=50;

    private int maximumPoolSize=70;

    private long keepAliveTime=5000;

    private BlockingDeque<Runnable> workQueue=new LinkedBlockingDeque<Runnable>();

    private ExecutorService threadPoolExecutor=new ThreadPoolExecutor(corePoolSize,maximumPoolSize,keepAliveTime,

            TimeUnit.MILLISECONDS,workQueue);



    public void scan(String ip,int start,int end){

        if(!validate(ip)){

            System.err.println("Ip format is illegal.");

            return;

        }

        if(start<0||end>=(1<<16)){

            System.err.println("The port number is illegal.");

            return;

        }

        InetAddress inetAddress=null;

        try {

            inetAddress = InetAddress.getByName(ip);

            if (!inetAddress.isReachable(5000)) {

                System.err.println(inetAddress.getHostAddress() + " is not reachable.");

                return;

            }

        } catch (IOException e) {

//            e.printStackTrace();

        }

        for(int i=start;i<=end;i++){

            while(workQueue.size()>maximumPoolSize){

                try {

//                    System.out.println("Thread queue is too long,sleep 500 milliseconds.");

                    Thread.sleep(500);

                } catch (InterruptedException e) {

                    e.printStackTrace();

                }

            }

            threadPoolExecutor.execute(new ScanWorker(inetAddress, i));

        }

        threadPoolExecutor.shutdown();

        while (!threadPoolExecutor.isTerminated()) {

            try {

                Thread.sleep(100);

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

        }

        System.out.println("Done.");

    }



    private boolean validate(String ip){

        if(ip==null||ip.length()==0) return false;

        String[] array=ip.split("\\.");

        if(array.length!=4) return false;

        for(String str:array){

            try {

                int num=Integer.valueOf(str);

            } catch (NumberFormatException e) {

                return false;

            }

        }

        return true;

    }

    private class ScanWorker implements Runnable{

        InetAddress inetAddress;

        int port;

        public ScanWorker(InetAddress inetAddress,int port){

            this.inetAddress=inetAddress;

            this.port=port;

        }

        @Override

        public void run() {

            Socket socket = null;

            try {



                socket = new Socket(inetAddress, port);

                //socket.setSoTimeout(1000);

                String serviceName = getServiceName(socket.getPort());

                System.out.println("Port:" + socket.getPort() + " ServiceName:" + serviceName + " Ip:" + inetAddress.getHostAddress());

            } catch (IOException e) {

//                e.printStackTrace();

            } finally {

                if (socket != null && !socket.isClosed()) {

                    try {

                        socket.close();

                    } catch (IOException e) {

                        e.printStackTrace();

                    }

                }

            }

        }



        private String getServiceName(int port) {

            String name ;

            switch (port) {

                case 21:

                    name = "FTP";

                    break;

                case 23:

                    name = "TELNET";

                    break;

                case 25:

                    name = "SMTP";

                    break;

                case 80:

                    name = "HTTP";

                    break;

                case 110:

                    name = "POP";

                    break;

                case 135:

                    name="RPC";

                    break;

                case 139:

                    name = "netBIOS";

                    break;

                case 443:

                    name = "HTTPS";

                    break;

                case 1433:

                    name = "SQL server";

                    break;

                case 3389:

                    name = "Terminal Service";

                    break;

                case 1521:

                    name = "Oracle";

                    break;

                case 8080:

                    name = "Tomcat";

                    break;

                default:

                    name="Unknown";

            }

            return name;

        }

    }



    public static void main(String[] args) {

        PortScanner portScanner=new PortScanner();

        portScanner.scan("192.168.0.20",1,65535);

//        portScanner.scan("74.125.143.115",1,10000);

    }

}