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

                
     
      org.apache.httpcomponents
                 
     
      httpclient
                 
     
      4.5.3
             
    

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);    }}