@Test

    public void doPost() throws Exception {

        CloseableHttpClient httpClient = HttpClients.createDefault();

//        HttpPost post = new HttpPost("http://localhost:8082/httpclient/post.html");

// 注意：如果请求的url后缀是 .html则浏览器不能返回正确的json数据，会返回406错误，所以需要修改请求url的后缀为其他

        HttpPost post = new HttpPost("http://localhost:8082/httpclient/post.action");

        CloseableHttpResponse response = httpClient.execute(post);

        HttpEntity entity = response.getEntity();

        String string = EntityUtils.toString(entity, "utf-8");

        System.out.println(string);

        response.close();

        httpClient.close();

    }

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

  <display-name>taotao-portal</display-name>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

  <!-- 加载spring容器 -->

    <context-param>

        <param-name>contextConfigLocation</param-name>

        <param-value>classpath:spring/applicationContext-*.xml</param-value>

    </context-param>

    <listener>

        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

    </listener>

    <!-- 解决post乱码 -->

    <filter>

        <filter-name>CharacterEncodingFilter</filter-name>

        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

        <init-param>

            <param-name>encoding</param-name>

            <param-value>utf-8</param-value>

        </init-param>

    </filter>

    <filter-mapping>

        <filter-name>CharacterEncodingFilter</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>

    <!-- springmvc的前端控制器 -->

    <servlet>

        <servlet-name>taotao-portal</servlet-name>

        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

        <!-- contextConfigLocation不是必须的， 如果不配置contextConfigLocation， springmvc的配置文件默认在：WEB-INF/servlet的name+"-servlet.xml" -->

        <init-param>

            <param-name>contextConfigLocation</param-name>

            <param-value>classpath:spring/springmvc.xml</param-value>

        </init-param>

        <load-on-startup>1</load-on-startup>

    </servlet>

    <!-- 伪静态化 -->

    <servlet-mapping>

        <servlet-name>taotao-portal</servlet-name>

        <url-pattern>*.html</url-pattern>

    </servlet-mapping>

    <!-- 配置需要返回json类型请求的拦截 -->

    <servlet-mapping>

        <servlet-name>taotao-portal</servlet-name>

        <url-pattern>*.action</url-pattern>

    </servlet-mapping>

</web-app>