Multithreading in jsp-HELP!!!

[mooling]

i have a jsp program which use to download some files from the internet. i try to make it into multi-threading download. but at the end it still run in single thread.Do i need to use java bean? please help me. Thanks.

<%@ page import="java.io.*"%>
<%@ page import="java.net.URL"%>
<%@ page import="java.net.URLConnection"%>



<%
String inStr="http://hgdownload.cse.ucsc.edu/goldenPath/hg17/vsMm5/axtNet/chr";
URL m_URL = null;
        URLConnection m_URLConn = null;
        boolean m_bOk = true;

            Thread thread1 = new Thread("T1");
        Thread thread2 = new Thread("T2");
            thread1.start();
            thread2.start();
            boolean thread1IsAlive = true;
                boolean thread2IsAlive = true;

    do {
        if(thread1IsAlive && !thread1.isAlive())
        {
            thread1IsAlive = false;


            try
            {
                //thread1.join();
            int x=1;
            String x_str = "";
            do{
                    x_str = Integer.toString(x);
                if (x==23) x_str = "X";
                else if (x==24) x_str="Y";

                m_URL = new URL(inStr+x_str+".axt.gz");
                m_URLConn = m_URL.openConnection();
                URLConnection uc = m_URL.openConnection();
                //InputStream in = new FileInputStream(uc.getInputStream());
                InputStream in = new BufferedInputStream(uc.getInputStream());
                ByteArrayOutputStream bs = new ByteArrayOutputStream(9999);
                int i;
                String sFile = "c:\\downloadChr\\mhuman\\chr"+x_str+".axt.gz";
                System.out.println("Getting file " + sFile);
                File of = new File(sFile);
                while(-1 != (i = in.read()))
                bs.write(i);
                in.close();
                byte bt[] = bs.toByteArray();
                FileOutputStream fos = new FileOutputStream(of);
                fos.write(bt);
                fos.close();
                        System.out.println("Thread 1 is dead.");

                    } while(x++ <12); //do
                }//try       
                catch(Exception e)
                {
                        e.printStackTrace();
                }
            }

            if(thread2IsAlive && !thread2.isAlive())
            {
                thread2IsAlive = false;


            try{
                //thread2.join();
            int x=13;
            String x_str = "";
            do{
                x_str = Integer.toString(x);
                    if (x==23) x_str = "X";
                else if (x==24) x_str="Y";

                m_URL = new URL(inStr+x_str+".axt.gz");
                        m_URLConn = m_URL.openConnection();
                        URLConnection uc = m_URL.openConnection();
                        //InputStream in = new FileInputStream(uc.getInputStream());
                        InputStream in = new BufferedInputStream(uc.getInputStream());
                        ByteArrayOutputStream bs = new ByteArrayOutputStream(9999);
                        int i;
                        String sFile = "c:\\downloadChr\\mhuman\\chr"+x_str+".axt.gz";
                        System.out.println("Getting file " + sFile);
                        File of = new File(sFile);
                        while(-1 != (i = in.read()))
                        bs.write(i);
                        in.close();
                        byte bt[] = bs.toByteArray();
                        FileOutputStream fos = new FileOutputStream(of);
                        fos.write(bt);
                        fos.close();
                        System.out.println("Thread 2 is dead.");

                        } while(x++ <24); //do
            }//try       
                    catch(Exception e)
                    {
                            e.printStackTrace();
                    }

        }//if
           }    while(thread1IsAlive || thread2IsAlive);



%>
<meta HTTP-EQUIV="REFRESH" content="1; url=http://localhost:8080/examples/jsp/HMC/HTML/downloaded.htm">