HttpClient之基本使用

<dependency> ???<groupId>org.apache.httpcomponents</groupId> ???<artifactId>httpclient</artifactId> ???<version>4.5</version></dependency><dependency> ???<groupId>org.apache.httpcomponents</groupId> ???<artifactId>httpcore</artifactId> ???<version>4.4.5</version></dependency>

package com.zns.test;import java.net.URI;import java.util.ArrayList;import java.util.List;import org.apache.http.NameValuePair;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.client.utils.URIBuilder;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.message.BasicNameValuePair;import org.apache.http.util.EntityUtils;import org.apache.log4j.Logger;public class Test { ???protected static Logger logger = Logger.getLogger(Test.class); ???public static void main(String[] args) throws Exception { ???????test1(); ???} ???// get请求 ???public static void test1() throws Exception { ???????// 创建Httpclient对象 ???????CloseableHttpClient httpclient = HttpClients.createDefault(); ???????// 创建http GET请求 ???????// HttpGet httpGet = new HttpGet("http://www.baidu.com/s?wd=java"); ???????// 含有参数 ???????URI uri = new URIBuilder("http://www.baidu.com/s").setParameter("wd", "java").build(); ???????HttpGet httpGet = new HttpGet(uri); ???????CloseableHttpResponse response = null; ???????try { ???????????// 执行请求 ???????????response = httpclient.execute(httpGet); ???????????// 判断返回状态是否为200 ???????????if (response.getStatusLine().getStatusCode() == 200) { ???????????????// 获取服务端返回的数据 ???????????????String content = EntityUtils.toString(response.getEntity(), "UTF-8"); ???????????????System.out.println(content); ???????????} ???????} finally { ???????????if (response != null) { ???????????????response.close(); ???????????} ???????????httpclient.close(); ???????} ???} ???// post请求 ???public static void test2() throws Exception { ???????// 创建Httpclient对象 ???????CloseableHttpClient httpclient = HttpClients.createDefault(); ???????// 创建http POST请求 ???????HttpPost httpPost = new HttpPost("http://www.xxx.com/search"); ???????// 设置请求参数 ???????List<NameValuePair> parameters = new ArrayList<NameValuePair>(); ???????parameters.add(new BasicNameValuePair("id", "1")); ???????parameters.add(new BasicNameValuePair("name", "abc")); ???????// 构造一个form表单式的实体 ???????UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters); ???????// 将请求实体设置到httpPost对象中 ???????httpPost.setEntity(formEntity); ???????// 如果是JSON数据 ???????// String jsonBody=""; ???????// StringEntity jsonEntity = new StringEntity(jsonBody, "utf-8"); ???????// jsonEntity.setContentType("application/json"); ???????// httpPost.setEntity(jsonEntity); ???????// 伪装浏览器请求 ???????httpPost.setHeader("User-Agent", ???????????????"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36"); ???????CloseableHttpResponse response = null; ???????try { ???????????// 执行请求 ???????????response = httpclient.execute(httpPost); ???????????// 判断返回状态是否为200 ???????????if (response.getStatusLine().getStatusCode() == 200) { ???????????????// 获取服务端返回的数据 ???????????????String content = EntityUtils.toString(response.getEntity(), "UTF-8"); ???????????????System.out.println(content); ???????????} ???????} finally { ???????????if (response != null) { ???????????????response.close(); ???????????} ???????????httpclient.close(); ???????} ???}}