java版模拟浏览器下载百度动漫图片到本地。

 package javaNet.Instance.ImageDownload;

 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;

 public class DownloadImgs {

     private String url=null;

     public DownloadImgs(String url) {
         this.url=url;
     }

     //----------------------------------gethtml start-----------------------------
     /**
      * visit the baidu.img page to get the html
      * @return inputStream
      * @throws IOException
      * @throws MalformedURLException
      */
     public InputStream GetBaiduImgHtml_Stream() throws IOException,MalformedURLException {
         URL img_Url=new URL(url);
         return img_Url.openStream();
     }

     /**
      * convert the stream to the string
      * @param inStrm
      * @return string of the page
      */
     public String InputStreamToString(InputStream inStrm){
         BufferedReader reader=new BufferedReader(new InputStreamReader(inStrm));
         StringBuilder sb=new StringBuilder();

         String  line=null;

         try {
             while((line=reader.readLine())!=null){
                 sb.append(line+'\n');
               }
             }
         catch (IOException e)
         {
             e.printStackTrace();
         }
         finally
         {
             try
             {
                 inStrm.close();
             }
             catch (IOException e)
             {
                 e.printStackTrace();
             }
         }
         return sb.toString();
     }

     /**
      * get the origin page of baidu.img
      * @return
      * @throws MalformedURLException
      * @throws IOException
      */
     public String GetBaiduImgHtml_Page() throws MalformedURLException, IOException
     {
         return this.InputStreamToString(this.GetBaiduImgHtml_Stream());
     }
     /**
      * test whether url have been visited the image page,and get the page.
      * @param page
      */
     public void Display_HtmlPage(String page)
     {
         System.out.println(page);
     }
     //-------------------------gethtml end----------------
     //-------------------------paretoimgurllist start-----
     public ArrayList<String> ParsePageToImgList(String page,String imgPa)
     {
         ArrayList<String> imgList=new ArrayList<String>();
         Pattern pattern=Pattern.compile(imgPa);
         Matcher matcher=pattern.matcher(page);
         while(matcher.find())
         {
             imgList.add(matcher.group(1));
         }
         return imgList;
     }
     //------------------------paretoimgurllist end---------
     //------------------------DownloadFile  start----------
     public  boolean DownloadFile(String imgUrl,int index,String path)
     {
         try
         {
             File f=new File(path+"\\"+index+".jpg");
             System.out.println("下载："+imgUrl);
             URL url=new URL(imgUrl);
             InputStream ins=url.openStream();
             FileOutputStream fout=new FileOutputStream(f);
             byte[] buffer=new byte[2048];
             int bytes_number;
             while((bytes_number=ins.read(buffer))!=-1)
             {
                 fout.write(buffer,0,bytes_number);
                 fout.flush();
             }
             ins.close();
             fout.close();
         }
         catch(Exception e)
         {
             System.out.println("下载失败！");
             e.printStackTrace();
             return false;
         }
         System.out.println("下载完成...");
         return true;
     }
     //------------------------DownloadFile  end----------

     //------------------------mkDir  start----------
     /**
      * make a direction for download the images in the native disk.
      * @param path the native path
      * @return is success
      */
     public void MkDir(String path)
     {
         File dir=new File(path);
         if(!dir.exists())
         {
             dir.mkdirs();
         }
     }
     //------------------------mkDir  end------------

     public void Display_ArrayList(ArrayList<String> list)
     {
         for(String temp:list)
         {
             System.out.println(temp);
         }
     }

     public static void main(String[] args) throws MalformedURLException, IOException
     {
         String imgPa="\"objURL\":\"(.*?)\"";
         String path="F:\\photos";
         int index=0;
         DownloadImgs downloadimgs=new DownloadImgs("http://image.baidu.com/search/index?"
                 + "tn=baiduimage&ipn=r&ct=201326592&cl=2&lm=-1&st=-1&fm=index&fr=&sf=1"
                 + "&fmq=&pv=&ic=0&nc=1&z=&se=1&showtab=0&fb=0&width=&height=&face=0"
                 + "&istype=2&ie=utf-8&word=%E5%8A%A8%E6%BC%AB&oq=%E5%8A%A8%E6%BC%AB&rsp=-1");
         //downloadimgs.Display_HtmlPage(downloadimgs.GetBaiduImgHtml_Page());
         String htmlPage=downloadimgs.GetBaiduImgHtml_Page();
         ArrayList<String> imgList=downloadimgs.ParsePageToImgList(htmlPage, imgPa);
         //downloadimgs.Display_ArrayList(imgList);
         downloadimgs.MkDir(path);
         for(String imgUrl:imgList)
             downloadimgs.DownloadFile(imgUrl, (index++)+1, path);

         System.out.println("一共下载了"+index+"个图片。");
     }
 }