前言：

　　时下互联网第一波的浪潮已消逝，随着而来的基于万千数据的物联网时代，因而数据成为企业的重要战略资源之一。基于数据抓取技术，本文介绍了java相关抓取工具，并附上demo源码供感兴趣的朋友测试！

 

1）JDK自带HTTP连接，获取页面或Json

 

2） JDK自带URL连接，获取页面或Json

 

 

3）HttpClient Get工具，获取页面或Json

 

 

 4）commons-io工具，获取页面或Json

 

 

5） Jsoup工具（通常用于html字段解析），获取页面,非Json返回格式】

 

---

完整代码：

package com.yeezhao.common.http;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;import org.apache.commons.httpclient.HttpClient;import org.apache.commons.httpclient.HttpMethod;import org.apache.commons.httpclient.methods.GetMethod;import org.apache.commons.io.IOUtils;import org.jsoup.Jsoup;/** * http工具对比 *  * @author Administrator -> junhong * *         2016年12月27日 */public class HttpFetchUtil {        /**     * 获取访问的状态码     * @param request     * @return     * @throws Exception     */    public static int getResponseCode(String request) throws Exception {        URL url = new URL(request);        HttpURLConnection conn = (HttpURLConnection) url.openConnection();        return conn.getResponseCode();    }    /**     * 1）JDK自带HTTP连接，获取页面或Json     * @param request     * @param charset     * @return     * @throws Exception     */    public static String JDKFetch(String request, String charset) throws Exception {        URL url = new URL(request);        HttpURLConnection conn = (HttpURLConnection) url.openConnection();        //模拟浏览器参数        conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36"                + " (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36");        if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {            InputStream input = conn.getInputStream();            StringBuffer sb = new StringBuffer();            BufferedReader reader = new BufferedReader(new InputStreamReader(input, charset));            String s;            while ((s = reader.readLine()) != null) {                sb.append(s + "\n");            }            input.close();            conn.disconnect();            return sb.toString();        }        return "";    }    /**     * 2） JDK自带URL连接，获取页面或Json     * @param request     * @param charset     * @return     * @throws Exception     */    public static String URLFetch(String request, String charset) throws Exception {        URL url = new URL(request);        return IOUtils.toString(url.openStream());    }    /**     * 3）HttpClient Get工具，获取页面或Json     * @param url     * @param charset     * @return     * @throws Exception     */    public static String httpClientFetch(String url, String charset) throws Exception {        // GET        HttpClient httpClient = new HttpClient();        httpClient.getParams().setContentCharset(charset);        HttpMethod method = new GetMethod(url);        httpClient.executeMethod(method);        return method.getResponseBodyAsString();    }    /**     * 4）commons-io工具，获取页面或Json     * @param url     * @param charset     * @return     * @throws Exception     */    public static String commonsIOFetch(String url, String charset) throws Exception {        return IOUtils.toString(new URL(url), charset);    }        /**     * 5） Jsoup工具（通常用于html字段解析），获取页面,非Json返回格式     * @param url     * @return     * @throws Exception     */    public static String jsoupFetch(String url) throws Exception {        return Jsoup.parse(new URL(url), 2 * 1000).html();    }}

 

测试代码：

package com.yeezhao.common.http;import org.junit.After;import org.junit.Before;import org.junit.Test;/** * 测试类 * 3个测试链接： * 1）百科网页 * 2）浏览器模拟获取接口数据 * 3）获取普通接口数据 * @author Administrator -> junhong * * 2016年12月27日 */public class HttpFetchUtilTest {    String seeds[] = {"http://baike.baidu.com/view/1.htm","http://m.ximalaya.com/tracks/26096131.json","http://remyapi.yeezhao.com/api/query?wd=%E5%91%A8%E6%98%9F%E9%A9%B0%E7%9A%84%E7%94%B5%E5%BD%B1"};    final static String DEFAULT_CHARSET = "UTF-8";    @Before    public void setUp() throws Exception {    }    @After    public void tearDown() throws Exception {        System.out.println("--- down ---");    }    @Test    public void testGetResponseCode() throws Exception{        for(String seed:seeds){            int responseCode = HttpFetchUtil.getResponseCode(seed);            System.out.println("ret="+responseCode);        }    }    @Test    public void testJDKFetch() throws Exception{        for(String seed:seeds){            String ret = HttpFetchUtil.JDKFetch(seed, DEFAULT_CHARSET);            System.out.println("ret="+ret);        }    }    @Test    public void testURLFetch() throws Exception{        for(String seed:seeds){            String ret = HttpFetchUtil.URLFetch(seed, DEFAULT_CHARSET);            System.out.println("ret="+ret);        }    }    @Test    public void testHttpClientFetch()throws Exception {        for(String seed:seeds){            String ret = HttpFetchUtil.httpClientFetch(seed, DEFAULT_CHARSET);            System.out.println("ret="+ret);        }    }    @Test    public void testCommonsIOFetch()throws Exception {        for(String seed:seeds){            String ret = HttpFetchUtil.commonsIOFetch(seed, DEFAULT_CHARSET);            System.out.println("ret="+ret);        }    }    @Test    public void testJsoupFetch() throws Exception{        for(String seed:seeds){            String ret = HttpFetchUtil.jsoupFetch(seed);            System.out.println("ret="+ret);        }    }}

 

 

附：相关jar依赖

...
     
      
       org.jsoup
      
      
       jsoup
      
      
       1.7.3
      
     
     
      
       commons-httpclient
      
      
       commons-httpclient
      
      
       3.1
      
     
     
      
       commons-io
      
      
       commons-io
      
      
       2.4
      
     ...

 

后语：

　　现在的数据时代，有着"数据即财富"的理念。因此，数据抓取技术将一直发展更新，基于此后续还将扩充针对POST方法的抓取方式，敬请期待！