SpringMVC 启用异步支持

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SpringMVC 启用异步支持，使用异步方法遇到的问题

Async support must be enabled on a servlet and for all filters involved in async request processing. 
This is done in Java code using the Servlet API or by adding
"<async-supported>true</async-supported>" 
to servlet and filter declarations in web.xml.

解决方案：

在web.xml里面添加支持：

        <!--   servlet 配置上异步支持 -->
        <async-supported>true</async-supported>
        <!--  filter 配置上异步支持 -->
        <dispatcher>ASYNC</dispatcher>

例：

    <!-- 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>

        <!--   配置上异步支持 -->
        <dispatcher>ASYNC</dispatcher>
    </filter-mapping>

    <!-- springmvc前端控制器 -->
    <servlet>
        <servlet-name>Test</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
        <!--   配置上异步支持 -->
        <async-supported>true</async-supported> 
    </servlet>
    <servlet-mapping>
        <servlet-name>Test</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>