JAVA技巧-命令行多线程源代码共享

JAVA技巧:命令行多线程源代码共享*该程序采纳10线程掌握下载，速度大大提升

*目前支持http协议下载

*切换到文件所在名目中

*在命令行中输入javaDownload5http://...，回车，即可运行程序

*/

importjava.io.*;

import.*;

publicclassDownload5extendsThread

{

privatelongstart;

privatelongend;

privateStringurls,name;

privateintID;

publicDownload5(Stringurls,Stringname,intID,longstart,longend)

{

this.start=start;

this.end=end;

this.urls=urls;

this.ID=ID;

=name;

}

publicvoidrun()

{

try

{

System.out.println(“线程“+ID+“启动...“);

Filefile=newFile(name);

URLurl=newURL(urls);

URLConnectioncon=url.openConnection();

con.setAllowUserInteraction(true);

con.setRequestProperty(“Range“,“bytes=“+start+“-“+end);

RandomAccessFilerand=newRandomAccessFile(file,“rw“);

rand.seek(start);

byte[]b=newbyte[2048];

BufferedInputStreambuffer=newBufferedInputStream(con.getInputStream());

intn=0;

while((n=buffer.read(b,0,b.length))!=-1)

{

rand.write(b,0,n);

}

System.out.println(“线程“+ID+“下载完毕“);

buffer.close();

rand.close();

errupt();

}

catch(Exceptionee)

{

ee.printStackTrace();

}

}

publicstaticvoidmain(String[]args)

{

Stringurls=args[0];

intu=urls.lastIndexOf(’/’);

Stringname=urls.substring(u+1,urls.length());

try

{

longtime=System.currentTimeMillis()/1000;

URLurl=newURL(urls);

URLConnectioncon=url.openConnection();

intfilelength=con.getContentLength();

intnum=10;

intsize=filelength/num;

Download5t=null;

CountTimecount=newCountTime(urls,name,time);

count.start();

for(inti=0;i<num;i++)

{

if(i!=num-1)

{

t=newDownload5(urls,name,i+1,size*i,size*(i+1)-1);

t.start();

}

else

{

t=newDownload5(urls,name,i+1,size*i,filelength);

t.start();

}

}

}

catch(Exceptionee)

{

ee.printStackTrace();

}

}

}

classCountTimeextendsThread

{

privateStringurls,name;

privatelongtime;

publicCountTime(Stringurls,Stringname,longtime)

{

this.urls=urls;

=name;

this.time=time;

}

publicvoidrun()

{

try

{

URLurl=newURL(urls);

URLConnectioncon=url.openConnection();

intfilelength=con.getContentLength();

Filef=newFile(name);

while(f.length()<filelength)

{

longLEN=f.length();

this.sleep(1000);

System.out.println((f.length()-LEN)/1024/1.0+“kb/s“);

}

System.out.println(“文件下载完毕“);

System.out.println(“下载所用