spring HandlerMethodArgumentResolver 的使用

淩亂°似流年 2023-07-09 13:28 6阅读 0赞

@RequestMapping("/")
 public String index(@CurrentUser User loginUser, Model model) {
 Set<String> permissions = userService.findPermissions(loginUser.getUsername());
 List<Resource> menus = resourceService.findMenus(permissions);
 model.addAttribute("menus", menus);
 return "index";
 }

/*
 * Copyright 2002-2007 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
 package com.github.zhangkaitao.shiro.chapter16.web.bind.annotation;
 
 import com.github.zhangkaitao.shiro.chapter16.Constants;
 
 import java.lang.annotation.*;
 
 /**
 * 绑定当前登录的用户
 * 不同于@ModelAttribute
 *
 * @author Zhang Kaitao
 */
 @Target({ElementType.PARAMETER})
 @Retention(RetentionPolicy.RUNTIME)
 @Documented
 public @interface CurrentUser {
 
 /**
 * 当前用户在request中的名字
 *
 * @return
 */
 String value() default Constants.CURRENT_USER;
 
 }

package com.github.zhangkaitao.shiro.chapter16.web.bind.method;
 
 import com.github.zhangkaitao.shiro.chapter16.web.bind.annotation.CurrentUser;
 import org.springframework.core.MethodParameter;
 import org.springframework.web.bind.support.WebDataBinderFactory;
 import org.springframework.web.context.request.NativeWebRequest;
 import org.springframework.web.method.support.HandlerMethodArgumentResolver;
 import org.springframework.web.method.support.ModelAndViewContainer;
 
 /**
 * 用于绑定@FormModel的方法参数解析器
 * User: Zhang Kaitao
 * Date: 13-1-12 下午5:01
 * Version: 1.0
 */
 public class CurrentUserMethodArgumentResolver implements HandlerMethodArgumentResolver {
 
 public CurrentUserMethodArgumentResolver() {
 }
 
 @Override
 public boolean supportsParameter(MethodParameter parameter) {
 if (parameter.hasParameterAnnotation(CurrentUser.class)) {
 return true;
 }
 return false;
 }
 
 @Override
 public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
 CurrentUser currentUserAnnotation = parameter.getParameterAnnotation(CurrentUser.class);
 return webRequest.getAttribute(currentUserAnnotation.value(), NativeWebRequest.SCOPE_REQUEST);
 }
 }