jsoup爬取网站图片

package com.ij34.JsoupTest;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;  

public class JsoupTest {  

    public static void downImages(String filePath,String imgUrl) throws Exception {  

        //获取网址
        String beforeUrl = imgUrl.substring(0,imgUrl.lastIndexOf("/")+1);
        //图片url后面的图片名字
        String fileName = imgUrl.substring(imgUrl.lastIndexOf("/")+1);
        String newFileName = URLEncoder.encode(fileName, "UTF-8");
        //"+"替换为UTF-8中的空格
        newFileName = newFileName.replaceAll("\\+", "\\%20");
        //编码之后的url
        imgUrl = beforeUrl + newFileName;
         //创建文件目录
            File files = new File(filePath);
            if (!files.exists()) {
                files.mkdirs();
            }
            URL url = new URL(imgUrl);
            HttpURLConnection connection = (HttpURLConnection)url.openConnection();
            InputStream is = connection.getInputStream();
            Date day=new Date();
            SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
            Random ra=new Random();
            int Num=ra.nextInt(11)+100;
            String fn=df.format(day)+Num;
            //去图片的格式例如.jpg .jpeg
            int lastIndex=fileName.lastIndexOf(".");
            String result=fileName.substring(lastIndex);
            File file = new File(filePath +fn+ result);
            FileOutputStream out = new FileOutputStream(file);
            int i = 0;
            while((i = is.read()) != -1){
                out.write(i);
            }  

    }  

    public static void main(String[] args) throws Exception {
        //int[] a=new int[]{};
          //for(int i=a.length-1;i>=0;i--){
          //爬取的网址
              String url = "http://www.ivsky.com/tupian/laohu_v45527";//+a[i];
            String savePath = "D://webmagic//";
            Document document = Jsoup.connect(url).get();
            Elements elements = document.getElementsByTag("img");
            for(Element element : elements){
                //图片的绝对路径
                String imgSrc = element.attr("abs:src");
                //取jpg格式
                if(imgSrc.contains(".jpg")){
                downImages(savePath, imgSrc);
                System.out.println(url+":"+imgSrc);
                }
            }
      //    }
    }
}