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。

1 @RequestMapping("savedata")
2     public @ResponseBody void savedata(HttpServletRequest req, HttpServletResponse resp) throws Exception {
3 
4         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：

 1 /**
 2      * Returns the value of a request parameter as a <code>String</code>,
 3      * or <code>null</code> if the parameter does not exist. Request parameters
 4      * are extra information sent with the request.  For HTTP servlets,
 5      * parameters are contained in the query string or posted form data.
 6      *
 7      * <p>You should only use this method when you are sure the
 8      * parameter has only one value. If the parameter might have
 9      * more than one value, use {@link #getParameterValues}.
10      *
11      * <p>If you use this method with a multivalued
12      * parameter, the value returned is equal to the first value
13      * in the array returned by <code>getParameterValues</code>.
14      *
15      * <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.
19      *
20      * @param name a <code>String</code> specifying the name of the parameter
21      *
22      * @return a <code>String</code> representing the single value of
23      * the parameter
24      *
25      * @see #getParameterValues
26      */
27     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