4.3.1 Reading Request Parameters
Read request parameters with @RequestParameter.
4.3.2 Reading Cookies
Read cookie values with @CookieParameter.
4.3.3 Reading Request Headers
Read request headers with @HeaderParameter.
4.3.4 Reading URL Query Parameters
Read URL query parameters with @QueryParameter.
4.3.5 Reading Attributes
Read request attributes with @AttributeParameter.
4.3.6 Request Parameter Groups
Bind many request parameters into a grouped object.
4.3.7 Automatic Parameter Type Conversion
Convert request parameter values to common Java types automatically.