import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

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

// 爬取图片  
public class Baidu {

    public static void main(String[] args) {
        String urlPath = "http://www.*****.com/chemo/2043_2.html";
        int index = 2;
        for (int j = 0; j <= 20; j++) {
            urlPath = "http://www.****.com/chemo/2043_" + (index++) + ".html";

            File f = new File("F:/imgs");
            if (!f.exists()) {
                f.mkdirs();
            }
            

            Document doc;
            try {
                doc = Jsoup.connect(urlPath).timeout(10000).get();

                // 获取后缀为jpg的图片的元素集合
                Elements pngs = doc.select("img[src$=.jpg]");
                // 遍历元素
                for (Element e : pngs) {
                    String src = e.attr("src");// 获取img中的src路径
                    // 获取后缀名
                    String imageName = src.substring(src.lastIndexOf("/") + 1,
                            src.length());
                    // 连接url
                    URL url;
                    try {
                        url = new URL(src);
                        URLConnection uri = url.openConnection();
                        // 获取数据流
                        InputStream is = uri.getInputStream();
                        // 写入数据流
                        OutputStream os = new FileOutputStream(new File(
                                "F:/imgs", imageName));

                        byte[] buf = new byte[3072];
                        int i = 0;
                        while ((i = is.read()) != -1) {
                            os.write(i);
                        }
　　　　　　　　　　　　　　　　os.close();
                    } catch (MalformedURLException e1) {
                        e1.printStackTrace();
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }

                }

            } catch (IOException e2) {
                e2.printStackTrace();
            }
        }

    }

}