SpringMVC 控制器默认支持GET和POST两种方式

在SpringMVC的controller中，@RequestMapping只写路径，不包含RequetMethod.GET和RequetMethod.POST，HttpServletRequest的getParameter(“*”)方法同时支持这两种方式。

@RequestMapping("savedata")
    public @ResponseBody void savedata(HttpServletRequest req, HttpServletResponse resp) throws Exception {

        String taskClass = req.getParameter("taskclass");

ServletRequest接口中对该方法的说明如下，可以从请求字符串（URL）和POST实体（通过getInputStream和getReader方法）中读取参数：

/**
     * Returns the value of a request parameter as a <code>String</code>,
     * or <code>null</code> if the parameter does not exist. Request parameters
     * are extra information sent with the request.  For HTTP servlets,
     * parameters are contained in the query string or posted form data.
     *
     * <p>You should only use this method when you are sure the
     * parameter has only one value. If the parameter might have
     * more than one value, use {@link #getParameterValues}.
     *
     * <p>If you use this method with a multivalued
     * parameter, the value returned is equal to the first value
     * in the array returned by <code>getParameterValues</code>.
     *
     * <p>If the parameter data was sent in the request body, such as occurs
16      * with an HTTP POST request, then reading the body directly via {@link
17      * #getInputStream} or {@link #getReader} can interfere
18      * with the execution of this method.
     *
     * @param name a <code>String</code> specifying the name of the parameter
     *
     * @return a <code>String</code> representing the single value of
     * the parameter
     *
     * @see #getParameterValues
     */
    public String getParameter(String name);

参考：

http://tomcat.apache.org/tomcat-5.5-doc/servletapi/index.html

http://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle/#mvc-ann-requestmapping