详解Java实现多种方式的http数据抓取

2025-05-29 0 60

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

详解Java实现多种方式的http数据抓取

2) JDK自带URL连接,获取页面或Json

详解Java实现多种方式的http数据抓取

3)HttpClient Get工具,获取页面或Json

详解Java实现多种方式的http数据抓取

4)commons-io工具,获取页面或Json

详解Java实现多种方式的http数据抓取

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

详解Java实现多种方式的http数据抓取

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完整代码:

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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:

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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

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...

<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>

...

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持快网idc。

原文链接:http://www.cnblogs.com/SeaSky0606/p/6224964.html

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