<mvc:argument-resolvers> 和 HandlerMethodArgumentResolver

 

 

<mvc:annotation-driven ignoreDefaultModelOnRedirect="true" conversion-service="" validator="" message-codes-resolver="">
        <mvc:argument-resolvers>
            <bean class="com.lay.user.util.CustomerArgumentResolver"/>
        </mvc:argument-resolvers>
        <mvc:message-converters>
            <bean class=""/>
        </mvc:message-converters>
        <mvc:return-value-handlers>
            <bean class=""/>
        </mvc:return-value-handlers>
</mvc:annotation-driven>

 

 

 

• <mvc:argument-resolvers>：参数解析器，可通过实现HandlerMethodArgumentResolver接口实现，该实现不会覆盖原有spring mvc内置解析对参数的解析，要自定义的内置支持参数解析可以考虑注册RequestMappingHandlerAdapter，以下为参考：

@Component

public class LoginUserHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver {

    @Autowired

    private UserService userService;


    @Override

    public boolean supportsParameter(MethodParameter parameter) {

        return parameter.getParameterType().isAssignableFrom(UserEntity.class) && parameter.hasParameterAnnotation(LoginUser.class);

    }


    @Override

    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer container,

                                  NativeWebRequest request, WebDataBinderFactory factory) throws Exception {

        //获取用户ID

        Object object = request.getAttribute(AuthorizationInterceptor.LOGIN_USER_KEY, RequestAttributes.SCOPE_REQUEST);

        if (object == null) {

            return null;

        }

        //获取用户信息

        return userService.queryObject((Long) object);

    }

}

 代码说明: supportsParameter方法主要判别参数是否为该解析器所支持的，支持：true ,不支持：false 

               如果返回true的话则调用resolveArgument方法。