<filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <async-supported>true</async-supported>
  </filter>

<servlet>
    <servlet-name>SpringMVCServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>
                WEB-INF/spring/appServlet/servlet-context.xml
            </param-value>
    </init-param>
    <load-on-startup>0</load-on-startup>
    <async-supported>true</async-supported>
  </servlet>

    @RequestMapping(value = "/query")
    @ResponseBody
    public DeferredResult<String> query(HttpServletRequest request,HttpServletResponse resp) {
        
        final DeferredResult<String> deferredResult = new DeferredResult<String>();

        // 超时设置
        deferredResult.onTimeout(new Runnable() {

            @Override
            public void run() {
                
                deferredResult.setResult("---超时啦---");

            }
            
        });
        //异步执行你的业务，在里面调用deferredResult.setResult()设置结果即可。
        
        //先返回
        return deferredResult;
    }