知识大全 Java多线程下载

Posted 2022-07-18 知

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　　同时下载多个文件不过单文件没有多线程的下载并且没有断点续传功能继续完善:

　　view plaincopy to clipboardprint? package util file;

　　public class Files

　　/*** * 获取应用程序的根目录 * @return 应用程序根目录 */ public static String getSysPath() return System getProperty( user dir );

　　package util file;

　　public class Files

　　/*** * 获取应用程序的根目录 * @return 应用程序根目录 */ public static String getSysPath() return System getProperty( user dir );

　　view plaincopy to clipboardprint?

　　view plaincopy to clipboardprint? <PRE class=csharp name= code >package re crawl;

　　import java io File; import java io FileOutputStream; import java io IOException; import java io InputStream; import HttpURLConnection; import URL;

　　import re Http;

　　public class WebSpider implements Runnable

　　private Http = new Http();

　　private String webAddress = ; private String destFile = ;

　　public void setWebAddress(String webAddress) this webAddress = webAddress;

　　public void setDestFile (String destFile) this destFile = destFile;

　　public boolean download() throws IOException InterruptedException

　　HttpURLConnection Conn = null;

　　try URL url = new URL(webAddress);

　　Conn = (HttpURLConnection) url openConnection(); ( GET ); ( User Agent Mozilla/ (Windows; U; Windows NT ; zh CN; rv: ) Gecko/ Firefox/ ); InputStream in = (); String fileType = fileType(()); System out println(fileType); FileOutputStream out = new FileOutputStream(new File(destFile + fileType)); int chByte = in read(); while (chByte != ) out write(chByte); //System out println(chByte); chByte = in read(); catch (Exception ex) System out println(ex toString()); finally (); return true;

　　public void run() try //System out println(Thread currentThread() getName()); download(); catch (IOException e) e printStackTrace(); catch (InterruptedException e) e printStackTrace(); </PRE>

　　view plaincopy to clipboardprint?package re crawl; import java io File; import java io FileOutputStream; import java io IOException; import java io InputStream; import HttpURLConnection; import URL; import re Http; public class WebSpider implements Runnable private Http = new Http(); private String webAddress = ; private String destFile = ; public void setWebAddress(String webAddress) this webAddress = webAddress; public void setDestFile (String destFile) this destFile = destFile; public boolean download() throws IOException InterruptedException HttpURLConnection Conn = null; try URL url = new URL(webAddress); Conn = (HttpURLConnection) url openConnection(); ( GET ); ( User Agent Mozilla/ (Windows; U; Windows NT ; zh CN; rv: ) Gecko/ Firefox/ ); InputStream in = (); String fileType = fileType(()); System out println(fileType); FileOutputStream out = new FileOutputStream(new File(destFile + fileType)); int chByte = in read(); while (chByte != ) out write(chByte); //System out println(chByte); chByte = in read(); catch (Exception ex) System out println(ex toString()); finally (); return true; public void run() try //System out println(Thread currentThread() getName()); download(); catch (IOException e) e printStackTrace(); catch (InterruptedException e) e printStackTrace(); package re crawl;

　　import java io File; import java io FileOutputStream; import java io IOException; import java io InputStream; import HttpURLConnection; import URL;

　　import re Http;

　　public class WebSpider implements Runnable

　　private Http = new Http();

　　private String webAddress = ; private String destFile = ;

　　public void setWebAddress(String webAddress) this webAddress = webAddress;

　　public void setDestFile (String destFile) this destFile = destFile;

　　public boolean download() throws IOException InterruptedException

　　HttpURLConnection Conn = null;

　　try URL url = new URL(webAddress);

　　public void run() try //System out println(Thread currentThread() getName()); download(); catch (IOException e) e printStackTrace(); catch (InterruptedException e) e printStackTrace();

　　view plaincopy to clipboardprint? <PRE class=csharp name= code >package re crawl;

　　import java io IOException;

　　import util file Files;

　　public class Crawl

　　/** * @param args * @throws IOException * @throws InterruptedException */ public static void main(String[] args) throws IOException InterruptedException

　　long begin = System currentTimeMillis(); WebSpider spider = new WebSpider(); WebSpider spider = new WebSpider(); spider setWebAddress( ); spider setDestFile(Files getSysPath() + / + spider );

　　spider setWebAddress( ); spider setDestFile(Files getSysPath() + / + spider );

　　Thread t = new Thread(spider ); Thread t = new Thread(spider ); t start(); t start();

　　t join(); t join();

　　System out println( the end ); System out println(System currentTimeMillis() begin);

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