問題：使用SpringMVC的Restful風格構建服務時，呼叫PUT方法時無法獲取引數。

解決方法：在web.xml配置HttpPutFormContentFilter

<!-- 隱藏的HttpMethod方法過濾器，表單提交中需要攜帶一個name=_method的隱藏域，value=put或者delete -->
<filter>
    <filter-name>HiddenHttpMethodFilter</filter-name>
    <filter-class>org.springframework.web.filter.HttpPutFormContentFilter</filter-class>
 
</filter>
<filter-mapping>
    <filter-name>HiddenHttpMethodFilter</filter-name>
    <servlet-name>dispatcherServlet</servlet-name>
</filter-mapping>
<security-constraint>
    <web-resource-collection>
        <web-resource-name>SSL</web-resource-name>
 
        <url-pattern>/rest/sys/login</url-pattern>
    </web-resource-collection>
    <user-data-constraint>
        <transport-guarantee>CONFIDENTIAL</transport-guarantee>
    </user-data-constraint>
</security-constraint>