前言

最近公司做了一组使用https协议证书加密的接口，为了能够使用户比较容易的使用这套接口，于是乎做了一个访问的例子程序。本文记录一下这个例子程序。

DefaultHttpClient deprecated

https的访问使用了Apache HttpComponents工具，在网上一些早一些版本的例子中使用了DefaultHttpClient类来创建请求。但是在4.3版本以后DefaultHttpClient类已经不推荐使用了，于是本例子改用CloseableHttpClient类来创建请求。

DefaultHttpClient的官方API说明

Deprecated. 
(4.3) use HttpClientBuilder see also CloseableHttpClient.

例子

直接上代码很简单的程序

maven引入包

       <dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId><version>4.5.3</version></dependency>

测试代码

package pub.lichao.test.controller;import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.message.BasicHeader;
import org.apache.http.util.EntityUtils;/*** 利用HttpClient进行post请求*/
public class HttpClientUtil {/*** 发送post请求* @param url 资源的url* @param jsonstr json格式入参* @param charset 编码方式* @return*/public static String doPost(String url,String jsonstr,String charset){String result = null;try{//创建CloseableHttpClient类HttpClient httpClient =  HttpClientBuilder.create().build();//创建post请求类HttpPost httpPost = new HttpPost(url);//增加支持json的http头信息httpPost.addHeader("Content-Type", "application/json");StringEntity se = new StringEntity(jsonstr);se.setContentType("text/json");se.setContentEncoding(new BasicHeader("Content-Type", "application/json"));httpPost.setEntity(se);//创建response请求HttpResponse response = httpClient.execute(httpPost);if(response != null){HttpEntity resEntity = response.getEntity();if(resEntity != null){//结果转换成string类型result = EntityUtils.toString(resEntity,charset);}}}catch(Exception e){e.printStackTrace();}return result;}/*** 测试方法* @param args*/public static void main(String[] args){String url = "https://openapi.puliantongxun.com/v1/get_token";String jsonStr = "{\"appId\":\"username\",\"appSecret\":\"secret\"}";String httpOrgCreateTestRtn = doPost(url, jsonStr, "utf-8");System.out.println("https result is :" + httpOrgCreateTestRtn);}
}