feat: 新增 SpringUtils 工具类

continew-starter-core/src/main/java/top/charles7c/continew/starter/core/util/SpringUtils.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2022-present Charles7c Authors. All Rights Reserved.
+ * <p>
+ * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.gnu.org/licenses/lgpl.html
+ * <p>
+ * 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 top.charles7c.continew.starter.core.util;
+
+import cn.hutool.core.util.ReflectUtil;
+import cn.hutool.core.util.StrUtil;
+import cn.hutool.extra.spring.SpringUtil;
+import jakarta.servlet.ServletContext;
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+import org.springframework.context.ApplicationContext;
+import org.springframework.web.accept.ContentNegotiationManager;
+import org.springframework.web.servlet.HandlerMapping;
+import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
+import org.springframework.web.servlet.handler.SimpleUrlHandlerMapping;
+import org.springframework.web.util.UrlPathHelper;
+import top.charles7c.continew.starter.core.constant.StringConstants;
+
+import java.util.Map;
+
+/**
+ * Spring 工具类
+ *
+ * @author Charles7c
+ * @since 1.1.1
+ */
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public class SpringUtils {
+
+    /**
+     * 取消注册静态资源映射
+     *
+     * @param handlerMap 静态资源映射
+     */
+    public static void deRegisterResourceHandler(Map<String, String> handlerMap) {
+        ApplicationContext applicationContext = SpringUtil.getApplicationContext();
+        // 获取已经注册的映射
+        final HandlerMapping resourceHandlerMapping = applicationContext.getBean("resourceHandlerMapping", HandlerMapping.class);
+        final Map<String, Object> oldHandlerMap = (Map<String, Object>) ReflectUtil.getFieldValue(resourceHandlerMapping, "handlerMap");
+        // 移除之前注册的映射
+        for (Map.Entry<String, String> entry : handlerMap.entrySet()) {
+            String pathPattern = StrUtil.appendIfMissing(entry.getKey(), StringConstants.PATH_PATTERN);
+            oldHandlerMap.remove(pathPattern);
+        }
+    }
+
+    /**
+     * 注册静态资源映射
+     *
+     * @param handlerMap 静态资源映射
+     */
+    public static void registerResourceHandler(Map<String, String> handlerMap) {
+        ApplicationContext applicationContext = SpringUtil.getApplicationContext();
+        // 获取已经注册的映射
+        final HandlerMapping resourceHandlerMapping = applicationContext.getBean("resourceHandlerMapping", HandlerMapping.class);
+        final Map<String, Object> oldHandlerMap = (Map<String, Object>) ReflectUtil.getFieldValue(resourceHandlerMapping, "handlerMap");
+        // 重新注册映射
+        final ServletContext servletContext = applicationContext.getBean(ServletContext.class);
+        final ContentNegotiationManager contentNegotiationManager = applicationContext.getBean("mvcContentNegotiationManager", ContentNegotiationManager.class);
+        final UrlPathHelper urlPathHelper = applicationContext.getBean("mvcUrlPathHelper", UrlPathHelper.class);
+        final ResourceHandlerRegistry resourceHandlerRegistry = new ResourceHandlerRegistry(applicationContext, servletContext, contentNegotiationManager, urlPathHelper);
+        for (Map.Entry<String, String> entry : handlerMap.entrySet()) {
+            // 移除之前注册的映射
+            String pathPattern = StrUtil.appendIfMissing(entry.getKey(), StringConstants.PATH_PATTERN);
+            oldHandlerMap.remove(pathPattern);
+            // 重新注册映射
+            String resourceLocations = StrUtil.appendIfMissing(entry.getValue(), StringConstants.SLASH);
+            resourceHandlerRegistry.addResourceHandler(pathPattern).addResourceLocations("file:" + resourceLocations);
+        }
+        final Map<String, ?> additionalUrlMap = ReflectUtil.<SimpleUrlHandlerMapping>invoke(resourceHandlerRegistry, "getHandlerMapping").getUrlMap();
+        ReflectUtil.<Void>invoke(resourceHandlerMapping, "registerHandlers", additionalUrlMap);
+    }
+}