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+'
');
              }
            } 
        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。");
    }
}