Big Data Java Foundation 19th day job

First question: Simple URL to get resources download import java.net.url;import java.net.urlconnection;import java.io.inputstream; import java.io.fileoutputstream;class downloaddemo{    public static  Void main (String[] args) {        string src_url =   "Http://one.jiangmin.com/jiangmin.zip";        try{             url url = new url (Src_url);             URLConnection conn =  Url.openconnection ();             string type  = conn.getcontenttype ();             int  length = conn.getcontentlength ();             inputstreaM in = conn.getinputstream ();             fileoutputstream fos = new fileoutputstream ("E:/jiangmin.zip");             byte[] buf = new byte[1024];             int len = 0;             while ((Len = in.read (BUF))  !=  -1) {                fos.write ( BUF);            }             fos.close ();             in.close ();         }catch (Exception e) {      &nBsp;      e.printstacktrace ();         }     }} second question: URL multi-threaded download Import javax.swing.jframe;import javax.swing.jlabel;import  javax.swing.jtextarea;import javax.swing.jbutton;import java.awt.event.mouseadapter;import  java.awt.event.MouseEvent;import java.net.URL;import java.net.URLConnection;import  java.io.inputstream;import java.io.randomaccessfile;import java.util.list;import  java.util.arraylist;class download{    private static final long  serialversionuid = -6944831795769317874l;    public static void  Main (String[] args) {        new downloadwindow ();     }}class DownloadWindow extends JFrame{    private  jtextarea url_text;    p Rivate jtextarea local_text;    public downloadwindow () {         ini ();     }    public void  ini () {        this.setsize (600,400);         this.setlocation (600,300);         This.setlayout (null);         jlabel url_label = new  jlabel ("url : ");         url_label.setbounds ( 10,10,100,20);         this.add (Url_label);         url_text = new jtextarea ();         url_text.seteditable (True);         url_text.setbounds ( 100,10,400,20);        This.add (url_text);         jlabel local_label = new  jlabel ("local : ");         local_label.setbounds ( 10,40,100,20);         this.add (Local_label);         local_text = new jtextarea ();         local_text.seteditable (True);         local_text.setbounds ( 100,40,400,20);         this.add (Local_text);         jbutton down_button = new jbutton ("Download");         down_button.setbounds (200,110,200,50);         down_button.addmouselistener (New mouseadapter () {             public&nbsP;void mouseclicked (mouseevent e) {                 string src_url = url_text.gettext ();                 system.out.println (Src_url);                 string local_ Addr = local_text.gettext ();                 new downloadmanager (downloadwindow.this,src_url,local_addr,5). Start ();             }                  this.add (Down_button);         this.setvisible (True);    }}class downloadmanager{     private downloadWindow window;    private string src_url;    private  String local_addr;    private int count;     Private downloadinfo info;    private list<downloadinfo> info_ List;    public downloadmanager (downloadwindow window,string src_url,string  local_addr,int count) {        this.window =  window;         "http://blog.51cto.com/viewpic.php?refimg=" + this.src_ Url = src_url;        this.local_addr = local_addr ;        this.count = count;         preparedownload ();    }    public void  Preparedownload () {        info_list = new ArrayList<DownloadInfo> ();         try{             url url = new url (Src_url);             system.out.println (Src_url);             int total_length = url.openconnection (). Getcontentlength ();             RandomAccessFile raf = new  Randomaccessfile (LOCAL_ADDR, "RW");             Raf.setlength (total_length);             raf.close ( );             system.out.println (total_length);             system.out.println (count);             int block = total_length / count;             DownloadInfo info = null;             for (int i = 0;i < count;i++) {                 info =  new downloadinfo ();                 info.setsrcurl (Src_url);            &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;INFO.SETLOCALADDR (LOCAL_ADDR);                 if ((count - 1)  == i) {                      info.setendpos (total_length - 1);                 }else{                      info.setstartpos ((i + 1)  * block - 1);                 }                 info_list.add (Info);             }        }catch (Exception e) {             e.printstacktrace ();         }    }    public void start () {    &nbSp;    int i = 0;        for ( Downloadinfo info : info_list) {             system.out.println (i);             new  downloadthread (Window,info). Start ();             i++;        }    }}class downloadthread  extends Thread{    private DownloadWindow window;     private downloadinfo info;    public downloadthread (DownloadWindow  window,downloadinfo info) {        this.window =  window;        this.info = info;    }     public&nBsp;void run () {        try{             system.out.println (Info.getsrcurl ());             url url = new url (Info.getsrcurl ());             URLConnection connect =  Url.openconnection ();             Connect.setrequestproperty ("Range", "bytes="  + info.getstartpos ()  +  "-"  +  Info.getendpos ());             inputstream in  = connect.getinputstream ();             Randomaccessfile raf = new randomaccessfile (Info.getlocaladdr (), "RW");             raf. Seek (Info.getendpos ());            byte[]  buf = new byte[1024];             Int len = 0;            while (len  = in.read (BUF))  != -1) {                 raf.write (BUF);             }            raf.close ();         }catch (exception e) {             e.printstacktrace ();        }     }}class DownloadInfo{    private String src_url;     private strinG local_addr;    private int start_pos;    private  int end_pos;    public downloadinfo () {    }     public downloadinfo (String src_url,string local_addr,int start_pos,int  end_pos) {         "http://blog.51cto.com/viewpic.php?refimg=" + this.src_url = src_url;        this.local_addr =  local_addr;        this.start_pos = start_pos;         this.end_pos = end_pos;    }     public string getsrcurl () {        return  Src_url;    }    public void setsrcurl (String src_url) {          "http://blog.51cto.com/viewpic.php?refimg=" + this.src_url = src_url;   &NBSP;&NBSP;}&NBSP;&NBSP;&NBSP;&NBSP;PUBLIC&NBSP;STRING&NBSP;GETLOCALADDR () {         return local_addr;    }    public void &NBSP;SETLOCALADDR (string local_addr) {        this.local_addr  = local_addr;    }    public int getstartpos () {         return start_pos;    }     public void setstartpos (Int start_pos) {         this.start_pos = start_pos;    }    public int  getendpos () {        return end_pos;     }    public&nbsP;void setendpos (int end_pos) {        this.end_pos =  end_pos;    }}

Big Data Java Foundation 19th day job