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
...<dependency><groupId>org.jsoup</groupId><artifactId>jsoup</artifactId><version>1.7.3</version></dependency><dependency><groupId>commons-httpclient</groupId><artifactId>commons-httpclient</artifactId><version>3.1</version></dependency><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.4</version></dependency>...
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！
以上就是http数据抓取Java实现的几种方式的详细内容，更多请关注其它相关文章！
一个人，一条路，人在途中，心随景动，
