【Jsoup爬取网页内容】

思路：根据给定URL分析其源码，得到所需的网页内容的位置，制定规则采集或下载之

采集的图片和文字示例：

tags:
tag:brazil
tag:dog
tag:pet
tag:pointyfaceddog
tag:Pets Around the World
imageUrl:http://farm2.staticflickr.com/1241/1050065123_9739d1283a_z.jpg

：

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

import org.jsoup.*;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
/**
 * @author ZTX
 * jsoup下载测试
 */
public class TestSoup {
  //待采集网址
    private static String url = "http://www.flickr.com/photos/9339954@N03/1050065123/in/photolist-2AMRM6-3JesJx-4n7zTL-4sVi7P-4t3yt6-4Ay5SR-4SV4Dz-57LhgB-5g78Rp-5huiYa-5jmQqP-5qawPz-5qaAFP-5qeRNy-5qf2gd-5qfdSQ-5qfe33-5qfKSf-5wYskN-5XxHra-5YcEX1-64zW7q-66U2Lp-67nNta-6aJgvN-6eFSCL-6fiVqR-6ghPXc-6nFAhA-6oZZso-6uQTsi-6vizoJ-6Dpn3e-6EuENc-6QK6TG-6Z4BBW-7347jr-7347nt-7347ra-7347ta-754FLt-78SRmT-7jdxPt-7vNc4q-h3h9sV-9JA3zQ-h3oJ39-h3gL6w-hrN3DF-ek7Tkt-9JA8ns";
  //采集的图片存放路径
    private static String imgPath = "./download/img.jpg";

    public static void main(String []args){
        // 采集和下载
	 getHTML(url);
	 downloadImg(getFlickrImgUrl(url),imgPath);
    }

    /**
     * @param url
     * 根据网址采集网页HTML文字内容
     */
    private static void getHTML(String url) {
	// 使用jsoup选择器语法，链接传递过来的url，并赋值给Document
        Document doc;
	try {
	    doc = Jsoup.connect(url).get();
	    Element tagsUL = doc.getElementById("thetags");//tags ul
	    Elements tags =tagsUL.getElementsByTag("li");
	    System.out.println("tags:");
	    for(Element i:tags) {
                 String tag=i.tagName();
                 System.out.println("tag:"+i.text());
	    }
	} catch (IOException e) {
	    e.printStackTrace();
	}

    }

    /**
     * 根据图片网址下载图片
     * 2013-12-15 20:41:54
     * @param realurl
     */
    private static void downloadImg(String imageUrl,String imgPath) {
	try {
	    //下载
	    URL   downloadUrl   =   new   URL( imageUrl);
	    URLConnection   uc   =   downloadUrl.openConnection();
	    InputStream   is   =   uc.getInputStream();
	    File   file   =   new   File( imgPath);
	    FileOutputStream   out   =   new   FileOutputStream(file);
	    int   i=0;
	    while   ((i=is.read())!=-1)   {
	    out.write(i);
	    }
	    is.close();
	} catch (IOException e) {
	    e.printStackTrace();
	}
    }

    /**
     * 根据网址得到图片URL
     * 2013-12-15 20:41:17
     * @param url
     * @return
     * @throws IOException
     */
    private static String getFlickrImgUrl(String url) {
	Document doc = null;
	try {
	    doc = Jsoup.connect(url).get();
	} catch (IOException e) {
	    e.printStackTrace();
	}
	String imageUrl = doc
		.getElementById("main-photo-container")
		.getElementsByTag("img")
		.first()
		.absUrl("src");
	System.out.println("imageUrl:"+imageUrl);
	return imageUrl;
    }
}