Spring MVC Data Binding: bind parameter to an object field with different name - spring

Question

Here is my #Controller:
#RequestMapping(value = "/add")
public void addMember(Member member) {
// ... ...
}
here is Member class:
class Member {
private Integer id;
private String username;
// ... ...
}
And here is the request url:
/add?memberId=1&username=bruce
How can I bind the memberId parameter to Member.id field?
Thanks!

Answer 1

If you don't want to use
#RequestMapping(value = "/add")
public void addMember(#RequestParam(value = "username") String username, ...) {
Member member = new Member(username, ...)
// ...
}
you can implement HandlerMethodArgumentResolver:
public class MemberHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver {
#Override
public boolean supportsParameter(MethodParameter parameter) {
return Member.class.equals(parameter.getParameterType());
}
#Override
public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
String username = webRequest.getParameter("username");
...
return new Member(username, ...);
}
}
And in config:
<mvc:annotation-driven>
<mvc:argument-resolvers>
<bean id="memberResolver" class="com.company ... MemberHandlerMethodArgumentResolver"/>
</mvc:argument-resolvers>
</mvc:annotation-driven>
or JavaConfig:
#Configuration
#EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {
...
#Override
public void addArgumentResolvers(List<Handlermethodargumentresolver> argumentResolvers) {
argumentResolvers.add(new MemberHandlerMethodArgumentResolver());
}
}

Answer 2

IMHO the simplest way to do that is to use an additional setter in Member class :
class Member {
private Integer id;
private String username;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public void setMemberId(Integer memberId) { // this one should to the trick
this.id = memberId;
}
// ... ...
}

Answer 3

You can use #JsonProperty Annotation for it.Like below.
class Member {
#JsonProperty("memberId")
private Integer id;
private String username;
// ... ...
}