通过http请求，返回一个json格式的数据，然后将json数据转化为java对象返回给调用方。Http采用OkHttp库，json转化采用fastjson库。

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0

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com.ok.http.client
okhttp
0.0.1-SNAPSHOT
jar

okhttp
http://maven.apache.org

UTF-8

org.jsoup
jsoup
1.11.3

    org.MongoDB
    bson
    3.6.4



    com.google.cloud.trace.instrumentation.jdbc
    driver
    0.1.1
    pom


    ch.qos.logback.contrib
    logback-mongodb-access
    0.1.5



    org.mongodb
    mongo-java-driver
    3.0.0


    com.squareup.okio
    okio
    1.11.0



    com.squareup.okhttp3
    okhttp
    3.6.0



    com.alibaba
    fastjson
    1.2.47



  junit
  junit
  3.8.1
  test

package com.ok.http.client.okhttp;

import java.util.List;
import java.util.Map;

public class ExecuteTask {
public static void main(String[] args) throws Exception {
// 调用downloadHtml下载网页
CrawlData crawlData = new CrawlData();
String url = null;
url = "http://top.chinaz.com/all/index.html";
System.out.println("开始爬取,请等待.");
String htmlBody = crawlData.downloadHtml(url);
System.out.println("爬取成功");
// 将下载的数据进行分析
List> dataList = Analysis.analysisData(htmlBody);
System.out.println("数据解析成功");
for (Map data : dataList) {
StoreData.adds(data);
System.out.println("存储成功");
}
}
}

package com.ok.http.client.okhttp;

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

/**

• Hello world!

• */
  public class CrawlData
  {
  public static String downloadHtml(String url) {
  String body = null;
  OkHttpClient client = new OkHttpClient();
  //请求
  Request request = new Request.Builder().url(url).build();
  //发起请求
  try {

      Response response = client.newCall(request).execute();
      body = new String(response.body().bytes());
  
  } catch (Exception e) {
      e.printStackTrace();
  }
  return body;//取得目标

  }
  }

  package com.ok.http.client.okhttp;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.io.IOException;
import java.util.*;

public class Analysis {
/**

• 解析数据
• @param htmlBody
• @return

• @throws IOException
  */
  public static List> analysisData(String htmlBody) throws Exception {
  // 获取目标HTML代码
  List> list = new ArrayList>();
  Document doc = Jsoup.parse(htmlBody);
  Elements elements = doc.select("ul.listCentent").select("li");
  System.out.println(" 数据集合大小=====" + elements.size());
  for (Element elmemt : elements) {
  Map map1 = new HashMap();
  // 获取公司名
  String siteName = elmemt.select("div.CentTxt > h4.rightTxtHead > a").text();
  System.out.println("siteName=====" + siteName);
  // 获取域名
  String domainName = elmemt.select("div.CentTxt > h4.rightTxtHead > span").text();
  System.out.println("domainName=====" + domainName);
  // 获取AlexaRank排名
  String AlexaRank = elmemt.select("li.clearfix >div.CentTxt > div.RtCPart >p").text();
  System.out.println("AlexaRank=====" + AlexaRank);
  // 获取公司简介
  String Synopsis = elmemt.select("div.CentTxt> p").text();
  System.out.println("公司简介====" + Synopsis);
  // 获取得分
  String score = elmemt.select("div.RtCRateCent>span").text();
  System.out.println(score);
  // 获取排名
  String siteRank = elmemt.select("div.RtCRateCent> strong").text();
  System.out.println("排名:" + siteRank);
  // 获取网址
  String webSite = "http://top.chinaz.com" + elmemt.select("a").first().attr("href");
  System.out.println("网址:" + webSite);
  // 获取备案信息
  String stringecordInformation = getGecordInformation(webSite);
  System.out.println("备案信息" + stringecordInformation);
  System.out.println("\t");
  // StoreData.add(siteName,domainName, AlexaRank , Synopsis, score, siteRank, webSite ,RecordInformation);
  map1.put("siteName", siteName);
  map1.put("domainName", domainName);
  map1.put("AlexaRank", AlexaRank);
  map1.put("公司简介", Synopsis);
  map1.put("排名", siteRank);
  map1.put("网址", webSite);
  map1.put("备案信息", stringecordInformation);
  list.add(map1);
  }
  return list;
  }

  /**

• 获取备案信息
• @param url
• @return
• @throws Exception
  */
  private static String getGecordInformation(String url) throws Exception {
  String htmlBody = CrawlData.downloadHtml(url);
  if (htmlBody != null) {
  Document doc = Jsoup.parse(htmlBody);
  String stringecordInformation = doc.select("li.TMain06List-Left>p").text();
  return stringecordInformation;
  }
  return null;
  }
  }

  package com.ok.http.client.okhttp;
  import com.alibaba.fastjson.JSONObject;
  import com.mongodb.MongoClient;
  import com.mongodb.client.MongoCollection;
  import com.mongodb.client.MongoDatabase;
  import org.bson.Document;
  import java.util.Map;

public class StoreData{

public static void adds(Map dataMap){
    try{
        // 连接到 mongodb 服务String siteRank
        MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
        // 连接到数据库
        MongoDatabase mongoDatabase = mongoClient.getDatabase("sit_rank");
        System.out.println(mongoDatabase);
        System.out.println("成功连接数据库");

        MongoCollection collection = mongoDatabase.getCollection("information");
        System.out.println(collection);
        System.out.println("集合 information 选择成功");
        //插入文档
        /**
         * 1. 创建文档 org.bson.Document 参数为key-value的格式
         * 2. 创建文档集合List
         * 3. 将文档集合插入数据库集合中 mongoCollection.insertMany(List) 插入单个文档可以用 mongoCollection.insertOne(Document)
         * */
        String siteName=null;String domainName=null;String AlexaRank=null;String Synopsis=null;
                String score=null;String siteRank=null;String webSite=null;String RecordInformation=null;
        JSONObject josn = JSONObject.parseObject(dataMap.toString());
                Document document = new Document(josn);
        document.put("_id",siteName);
        document.append("domainName", domainName);
        document.append("AlexaRank",AlexaRank);
        document.append("Synopsis",Synopsis);
        document.append("score",score);
        document.append("siteRank",siteRank);
        document.append("webSite",webSite);
        document.append("RecordInformation",RecordInformation);
        collection.insertOne(document);
        System.out.println("文档插入成功");
        //关闭mongodb连接
        mongoClient.close();
        System.out.println("MongoDB连接已关闭");
    }catch(Exception e){
        System.err.println( e.getClass().getName() + ": " + e.getMessage() );
    }
}

}

名称栏目：OkHttpClient和Jsoup进行网页爬取
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