spring mvc自定义注解--登录时密码加密注解

/**
* 使用该注解不用再MD5转换了
*
* @author adonis
*
*/
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Password {

String value() default "password";
}

public class PasswordAnnotationResolver implements
HandlerMethodArgumentResolver {

@Override
public boolean supportsParameter(MethodParameter parameter) {
return parameter.getParameterAnnotation(Password.class) != null;
}

@Override
public Object resolveArgument(MethodParameter parameter,
ModelAndViewContainer mavContainer, NativeWebRequest webRequest,
WebDataBinderFactory binderFactory) throws Exception {
HttpServletRequest request = (HttpServletRequest) webRequest
.getNativeRequest();
Password passwordAnno = parameter
.getParameterAnnotation(Password.class);
String password = request.getParameter(passwordAnno.value());
return MD5Util.MD5(password);
}

}

<mvc:annotation-driven >
<mvc:argument-resolvers>
<bean class="xxx.xxxx.xxxx.PasswordAnnotationResolver"/>
</mvc:argument-resolvers>
</mvc:annotation-driven>

public Map<String, Object> login(
HttpServletRequest request,//
@RequestParam("username") String userName,//
@Password String password, //自定义的注解。此时password已经是加密的了
@RequestParam("randCheckCode") String randCheckCode) {

//判断逻辑
}