spring mvc自定义注解--登录时密码加密注解

1，定义注解名称接口

/**
 * 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";
}

2，实现HandlerMethodArgumentResolver 接口

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);
    }

}

3，自定义注解驱动注册

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

4,使用

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  
}