Spring MVC如何将请求参数绑定到Controller属性，如struts2

Question

In Spring MVC, it is easy to bind request parameter to method paramaters handling the request. I just use @RequestParam

@Controller
public class ConfirmOrderAction {
       public String toConfirmOrder(@RequestParam String itemIds){
       } 
}

but i hope like this

@Controller
public class ConfirmOrderAction {
       @RequestParam
       private String itemIds;
       getItemIds(){}
       setItemIds(){}
       public String toConfirmOrder(){} 
}

like struts2

Answer 1

This is not possible with Spring's @RequestParam annotation:

@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RequestParam {
 ...
}

This means @RequestParam can only be used on method parameters.

Do not forget that Spring controllers are singletons by default (one instance is shared by multiple requests). So it would be a bad idea to bind request parameters to instance fields.