Big Data Java Foundation 20th day Job

The first topic: Multi-threaded download, display the download progress bar. (Pause function and breakpoint resume for development). import javax.swing.jframe;import javax.swing.jlabel;import javax.swing.jtextarea;import  javax.swing.jbutton;import javax.swing.jprogressbar;import java.awt.event.mouseadapter;import  java.awt.event.mouseevent;import java.awt.component;import java.net.url;import  java.net.urlconnection;import java.io.file;import java.io.fileinputstream;import  Java.io.fileoutputstream;import java.io.objectinputstream;import java.io.objectoutputstream;import  java.io.bytearrayinputstream;import java.io.inputstream;import java.io.randomaccessfile;import  java.util.list;import java.util.arraylist;import java.util.properties;class download{     private static final long serialversionuid = - 6944831795769317874l;    public static void main (String[] args) {      &Nbsp;  new downloadwindow ();     }}class downloadwindow extends  jframe{private jtextarea url_text;private jtextarea local_text;private jbutton  pause_button;private JProgressBar[] bar_arr;public boolean is_pause =  False;private int every_count = 0;    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);     &nbSp;   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 (200,110,100,50);         down_ Button.addmouselistener (New mouseadapter () {             public void mouseclicked (mouseevent e) {String src_url = url_ Text.gettext (); String local_addr = local_text.gettext ();                 downloadmanager manager = new downloadmanager ( downloadwindow.this,src_url,local_addr,5); Addbar (Manager.getlistinfo ()); Manager.start ();             }        });         this.add (Down_button); Jbutton pause_button = new jbutton ("Stop");p Ause_Button.setbounds (320,110,100,50);p Ause_button.addmouselistener (New mouseadapter () {public void  Mouseclicked (mouseevent e) {downloadwindow.this.is_pause = ! Downloadwindow.this.is_pause;pause_button.settext (downloadwindow.this.is_pause ?  "Start" &NBSP;:   "Stop"); String src_url = url_text.gettext (); String local_addr = local_text.gettext (); if (! DownloadWindow.this.is_pause) {list<downloadinfo> info_list = new arraylist< Downloadinfo> (); Try{objectinputstream ois = new objectinputstream (new  FileInputStream (local_addr +  ". tmp")); list<downloadinfo> list =  (list<downloadinfo>) Ois.readobject ();} catch (Exception ex) {ex.printstacktrace ();} Downloadmanager manager = new downloadmanager (downloadwindow.this,info_list); AddBar ( Manager.getlistinfo ()); Manager.start ();}}); This.add (Pause_button);     &nbsP;   this.setvisible (True);     }public void addbar (List< Downloadinfo> info_list) {bar_arr = new jprogressbar[info_list.size ()];int y =  200;for (Int i=0;i<info_list.size (); i++) {downloadinfo info = info_list.get (i); bar_ Arr[i] = new jprogressbar (); System.out.println ("= = ="  + info.getendpos ()); SYSTEM.OUT.PRINTLN ("---"  + info.getstartpos ()); Bar_arr[i].setmaximum (Info.getendpos ()  -  Info.getstartpos ()  + 1);  bar_arr[i].setbounds (100,y +  (i*25), 400,10); This.add (Bar_arr [i]);} This.repaint ();} Public void updatebar (Int length,int index) {Int new_value = bar_arr[index]. GetValue ()  + length; System.out.println (New_value); Bar_arr[index].setvalue (New_value); if (New_value >= bar_arr[index]. Getmaximum ()) {every_count ++;if (every_count >= bar_arr.length) {FinishbaR ();}}} Public void finishbar () {for (Component comp : bar_arr) {this.remove (comp);} This.repaint ();}} 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,list<downloadinfo> info_list) {This.window = window;this.info_ List = 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); Int total_length (Src_url);  = url.openconnection (). Getcontentlength (); Randomaccessfile raf = new randomaccessfile (LOCAL_ADDR, "RW"); Raf.setlength (total_length); Raf.close ();int block = total_length / count;downloadinfo info = null; for (int i = 0;i < count;i++) {info = new downloadinfo (); Info.setindex (i); Info.setsrcurl (Src_url); info.setlocaladdr (LOCAL_ADDR); Info.setstartpos (I * block); if ((count - 1)  == i) {Info.setendpos (total_length - 1);} Else{info.setendpos ((i + 1)  * block - 1);} Info_list.add (info);}} catch (exception e) {e.printstacktrace ();}} Private list<downloadinfo> readlistinfo (file tmp_file) {LiSt<downloadinfo> info_list = new arraylist<downloadinfo> (); try{Properties  prop = new properties ();p rop.load (New fileinputstream (tmp_file)); String tmp_url = prop.getproperty ("url"); Int count = integer.parseint ( Prop.getproperty ("Count"));D ownloadinfo info = null;for (int i=0;i<count;i++) {String  value = prop.getproperty ("Thread.")  + i); String[] arr = value.split (";"); Info = new downloadinfo (); Info.setindex (i); Info.setsrcurl (Tmp_url); Info.setstartpos ( Integer.parseint (Arr[0]); Info.setendpos (Integer.parseint (arr[1])); Info.setamount (Integer.parseint (arr[2))); String path = tmp_file.getabsolutepath ();p ath = path.substring (0,path.lastIndexOf (".")); INFO.SETLOCALADDR (path); Info_list.add (info);} Return info_list;} catch (exception e) {e.printstacktrace ();} Return null;}     public&nbsP;void start () {for (downloadinfo info : info_list) {try{downloadthread s =  New downloadthread (Window,info); S.start (); S.join ();} catch (exception e) {e.printstacktrace ();}} if (window.is_pause) {Try{fileoutputstream fos = new fileoutputstream (local_addr +   ". tmp"); Objectoutputstream oos = new objectoutputstream (FOS); Oos.writeobject (info_ list);} catch (exception e) {e.printstacktrace ();}}     }public list<downloadinfo> getlistinfo () {return info_list;}} class downloadthread extends thread{private downloadwindow window;private  Downloadinfo info;public downloadthread (Downloadwindow window,downloadinfo info) { This.window = window;this.info = info;} Public void run () {Try{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 length = 0;while ((length  = in.read (BUF))  != -1) {System.out.println (length +  "+ +"  +  Info.getindex ()); Raf.write (buf,0,length); Window.updatebar (Length,info.getindex ()); Thread.Sleep (+); if (Window.is_pause) {break;}} 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;private int index;private  int amount;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;} Public string getlocaladdr () {return local_addr;} PUBLIC&NBSP;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 void seteNdpos (Int end_pos) {this.end_pos = end_pos;} Public int getindex () {return index;} Public void setindex (Int index) {this.index = index;} Public int getamount () {return amount;} Public void setamount (int amount) {this.amount = amount;}}

This article is from the "Forest Sensitive" blog, please be sure to keep this source http://senlinmin.blog.51cto.com/6400386/1793104

Big Data Java Foundation 20th day Job