httpclient+jsoup实现网页信息抓取

需求分析：抓取:http://tools.2345.com/rili.htm中的万年历（阳历、阴历等等）。

1.首先为抓取的内容创建一个类。实现封装。

package com.wan.domain;

public class Almanac {
	private String solar;        /* 阳历 e.g.2016年 4月11日 星期一 */
	private String lunar;        /* 阴历 e.g. 猴年 三月初五*/
	private String chineseAra;    /* 天干地支纪年法 e.g.丙申年 壬辰月 癸亥日*/
	private String should;         /* 宜e.g. 求子 祈福 开光 祭祀 安床*/
	private String avoid;         /* 忌 e.g. 玉堂（黄道）危日，忌出行*/
	public String getSolar() {
		return solar;
	}
	public void setSolar(String solar) {
		this.solar = solar;
	}
	public String getLunar() {
		return lunar;
	}
	public void setLunar(String lunar) {
		this.lunar = lunar;
	}
	public String getChineseAra() {
		return chineseAra;
	}
	public void setChineseAra(String chineseAra) {
		this.chineseAra = chineseAra;
	}
	public String getShould() {
		return should;
	}
	public void setShould(String should) {
		this.should = should;
	}
	public String getAvoid() {
		return avoid;
	}
	public void setAvoid(String avoid) {
		this.avoid = avoid;
	}
	 public Almanac(String solar, String lunar, String chineseAra, String should,String avoid) {
		 this.solar = solar;
		 this.lunar = lunar;
		 this.chineseAra = chineseAra;
		 this.should = should;
		 this.avoid = avoid;
　　　　　}
	
}

2.编写逻辑，实现抓取（需要导入相应的jar包：commons-httpclient-3.0.1.jar、commons-logging.jar、httpcore-4.4.jar、jsoup-1.7.3.jar、org.apache.httpcomponents.httpclient_4.5.3.jar）

package com.wan.controller;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import org.apache.http.HttpEntity;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

import com.wan.domain.Almanac;

public class AlmanacUtil {
	/**
     * 单例工具类
     */
    private AlmanacUtil() {
    }
    /**
     * 获取万年历信息
     * @return
     */
    public static Almanac getAlmanac(){
        String url="http://tools.2345.com/rili.htm";
        String html=pickData(url);
        Almanac almanac=analyzeHTMLByString(html);
        return almanac;
    }
    
    /*
     * 爬取网页信息
     */
    private static String pickData(String url) {
        CloseableHttpClient httpclient = HttpClients.createDefault();
        try {
            HttpGet httpget = new HttpGet(url);
            CloseableHttpResponse response = httpclient.execute(httpget);
            try {
                // 获取响应实体
                HttpEntity entity = response.getEntity();
                // 打印响应状态
                if (entity != null) {
                    return EntityUtils.toString(entity);
                }
            } finally {
                response.close();
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (ParseException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭连接,释放资源
            try {
                httpclient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
    
    /*
     * 使用jsoup解析网页信息
     */
    private static Almanac analyzeHTMLByString(String html){
        String solarDate,lunarDate,chineseAra,should,avoid=" ";
        Document document = Jsoup.parse(html);
        //公历时间
        solarDate=getSolarDate(document,"bjtime");
        //农历时间
        Element eLunarDate=document.getElementById("info_nong");
        lunarDate=eLunarDate.child(0).html().substring(1,3)+eLunarDate.html().substring(11);
        //天干地支纪年法
        Element eChineseAra=document.getElementById("info_chang");
        chineseAra=eChineseAra.text().toString();    
        //宜
        should=getSuggestion(document,"yi");
        //忌
        avoid=getSuggestion(document,"ji");
        Almanac almanac=new Almanac(solarDate,lunarDate,chineseAra,should,avoid);
        return almanac;
    }
    /*
     * 获取忌/宜
     */
    private static String getSuggestion(Document doc,String id){
        Element element=doc.getElementById(id);
        Elements elements=element.getElementsByTag("a");
        StringBuffer sb=new StringBuffer();
        for (Element e : elements) {
            sb.append(e.text()+" ");
        }
        return sb.toString();
    }

    /*
     * 获取公历时间,用yyyy年MM月dd日 EEEE格式表示。
     * @return yyyy年MM月dd日 EEEE
     */
    private static String getSolarDate(Document doc,String id) {
        Calendar calendar = Calendar.getInstance();
        Date solarDate = calendar.getTime();
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy年MM月dd日 EEEE");
        return formatter.format(solarDate);
    }
}

注：公历时间没有实现网页抓取。是获取的系统的时间

3.编写测试

package com.wan.test;

import com.wan.controller.AlmanacUtil;
import com.wan.domain.Almanac;

public class Test {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		 	Almanac almanac=AlmanacUtil.getAlmanac();
	        System.out.println("公历时间"+almanac.getSolar());
	        System.out.println("农历时间"+almanac.getLunar());
	        System.out.println("天干地支"+almanac.getChineseAra());
	        System.out.println("宜"+almanac.getShould());
	        System.out.println("忌"+almanac.getAvoid());
	}

}

最后在控制台输出：