Java多线程下载

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 com.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 com.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 com.core.crawl;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.net.HttpURLConnection;
    import java.net.URL;
    import com.core.http.Http;
    public class WebSpider implements Runnable{
        private Http 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 httpConn = null;
        try {
            URL url = new URL(webAddress);
            httpConn = (HttpURLConnection) url.openConnection();
            httpConn.setRequestMethod("GET");
            httpConn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14");
            InputStream in = httpConn.getInputStream();
            String fileType = http.fileType(httpConn.getContentType());
            System.out.println(fileType);
            FileOutputStream out = new FileOutputStream(new File(destFile + fileType));
            int chByte = in.read();
            while (chByte != -1) {
            out.write(chByte);
            //System.out.println(chByte);
            chByte = in.read();
            }
        } catch (Exception ex) {
            System.out.println(ex.toString());
        } finally {
            httpConn.disconnect();
        }
        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 com.core.crawl;    importjava.io.File;   import java.io.FileOutputStream;  importjava.io.IOException;   import java.io.InputStream;  importjava.net.HttpURLConnection;   import java.net.URL;    importcom.core.http.Http;     public class WebSpiderimplementsRunnable{              private Http http = newHttp();         privateString webAddress = "";       private StringdestFile ="";              public void setWebAddress(StringwebAddress){      this.webAddress = webAddress;       }             public voidsetDestFile (String destFile){       this.destFile =destFile;      }              public boolean download() throwsIOException,InterruptedException {         HttpURLConnection httpConn=null;         try {           URL url =newURL(webAddress);                    httpConn =(HttpURLConnection)url.openConnection();          httpConn.setRequestMethod("GET");          httpConn.setRequestProperty("User-Agent","Mozilla/5.0 (Windows; U;Windows NT 5.1; zh-CN; rv:1.8.1.14)Gecko/20080404Firefox/2.0.0.14");           InputStream in=httpConn.getInputStream();           String fileType=http.fileType(httpConn.getContentType());          System.out.println(fileType);          FileOutputStream out = newFileOutputStream(new File(destFile +fileType));           int chByte =in.read();           while (chByte !=-1) {          out.write(chByte);          //System.out.println(chByte);          chByte = in.read();          }       } catch (Exception ex){          System.out.println(ex.toString());       } finally{          httpConn.disconnect();       }       return true;      }         publicvoid run() {       try{          //System.out.println(Thread.currentThread().getName());          download();          } catch (IOException e) {          e.printStackTrace();       } catch(InterruptedException e) {          e.printStackTrace();       }      }   }  package com.core.crawl;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.net.HttpURLConnection;
    import java.net.URL;
    import com.core.http.Http;
    public class WebSpider implements Runnable{
        private Http 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 httpConn = null;
     try {
         URL url = new URL(webAddress);
         httpConn = (HttpURLConnection) url.openConnection();
         httpConn.setRequestMethod("GET");
       httpConn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows;U;Windows NT 5.1; zh-CN; rv:1.8.1.14) Gecko/20080404Firefox/2.0.0.14");
         InputStream in = httpConn.getInputStream();
         String fileType = http.fileType(httpConn.getContentType());
         System.out.println(fileType);
         FileOutputStream out = new FileOutputStream(new File(destFile + fileType));
         int chByte = in.read();
         while (chByte != -1) {
      out.write(chByte);
      //System.out.println(chByte);
      chByte = in.read();
         }
     } catch (Exception ex) {
         System.out.println(ex.toString());
     } finally {
         httpConn.disconnect();
     }
     return true;
        }
        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 com.core.crawl;
    import java.io.IOException;
    import com.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 spider2 = new WebSpider();
        WebSpider spider1 = new WebSpider();
        spider1.setWebAddress("http://www.163.com");
        spider1.setDestFile(Files.getSysPath() + "/"+"spider1.");
        spider2.setWebAddress("http://blog.csdn.net/longronglin");
        spider2.setDestFile(Files.getSysPath() + "/"+"spider2.");
        Thread t1 = new Thread(spider1);
        Thread t2 = new Thread(spider2);
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println("the end");
        System.out.println(System.currentTimeMillis() - begin);
        }

    }</PRE>
    <PRE class=csharp name="code"> </PRE>
    <PRE class=csharp name="code">测试通过：</PRE>
    <PRE class=csharp name="code"></PRE>