Java获取豆瓣电影《毒液:致命守护者》影评信息

package util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

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

public class DataDownUtil {
    /**
     * @author UPO
     * @param url
     * @param encoding
     * @return String 网页的源代码
     * <a href="http://www.baidu.com">百度</a>
     */
    public static String getHtmlResourceByUrl(String url,String encoding){
        StringBuffer buffer=new StringBuffer();
        URL urlobj=null;
        URLConnection uc=null;
        InputStreamReader isr=null;
        BufferedReader reader=null;
        try {
            //建立网络连接
            urlobj=new URL(url);
            //打开网络
            uc=urlobj.openConnection();
            //建立文件输入流的对象
            isr=new InputStreamReader(uc.getInputStream(), encoding);
            //建立文件缓冲写入流（相当于ctrl+v放入内存中）
            reader=new BufferedReader(isr);
            
            //建立临时变量
            String temp=null;
            while((temp=reader.readLine())!=null){
                buffer.append(temp);
                buffer.append("\n");
            }
            
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.out.println("网络连接不可用");
        }catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.out.println("网络连接失败");
        }finally {
            if(isr!=null){
                try {
                    isr.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
        return buffer.toString();
    }
    public static String getContext(){
        
        String context=null;
        int start=0;
        while(start>=0&&start<=20){
            
            
            String url="https://movie.douban.com/subject/3168101/comments?start="+start+"&limit=20&sort=new_score&status=P";
            String encoding="utf-8";
            start=start+20;
            //1.获取网页源代码
            String html=getHtmlResourceByUrl(url, encoding);
            //System.out.println(html);
            //2.
            Document document=Jsoup.parse(html);
            Element element=document.getElementById("comments");
            Elements elements=element.getElementsByClass("comment-item");
            for (Element ele : elements) {
                //https://movie.douban.com/subject/3168101/comments?start=20&limit=20&sort=new_score&status=P
                String name=ele.getElementsByTag("a").last().text();
                String desc=ele.getElementsByClass("short").text();
                String time=ele.getElementsByClass("comment-time").text();
                String votes=ele.getElementsByClass("votes").text();
                System.out.println("\nname:"+name+"\ndesc:"+desc+"\ntime:"+time+"\nvotes:"+votes);
                context="\nname:"+name+"\ndesc:"+desc+"\ntime:"+time+"\nvotes:"+votes;
            }
        }
        return context;
    }
    
    public static void writeFileByLine(String content,String filePath){
        File file=new File(filePath);
        try {
            FileOutputStream out=new FileOutputStream(file);
            out.write(content.getBytes());
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
    public static void main(String[] args) {
        System.out.println("你好阿泡");
        System.out.println(getContext());
        
        
        
    }

}