请求地址：@RequestMapping(value="/User")
2.method 属性请求方法：@RequestMapping(method = "RequestMethod.GET")
3.params 属性请求参数：@RequestMapping(params = "username")
4.header 属性请求头：@RequestMapping(headers = "Host=localhost:8080")
5.path 属性请求地址支持通配符：@RequestMapping(value = "/User/*")
6.name 属性方法的注解：@RequestMapping(value = "User",name = "获取用户信息")
7. consumers属性指定处理请求的提交内容类型：@RequestMapping(consumers="text/html")
8.produces属性指定处理请求的提交内容类型和字符编码：@RequestMapping(produces = "text/html,charset=utf-8")
