Interceptor

pom.xml

@@ -28,9 +28,16 @@
             <scope>provided</scope>
         </dependency>
         <!-- filter end -->
+        <!-- interceptor -->
+        <!--        <dependency>-->
+        <!--            <groupId>org.springframework</groupId>-->
+        <!--            <artifactId>org.springframework.web.servlet</artifactId>-->
+        <!--            <version>3.1.0.RELEASE</version>-->
+        <!--        </dependency>-->
+        <!-- interceptor end -->
         <dependency>
             <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter</artifactId>
+            <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
 
         <dependency>

src/main/java/stu/base/interceptor/MyInterceptor.java

@@ -0,0 +1,28 @@
+package stu.base.interceptor;
+
+import org.springframework.web.servlet.HandlerInterceptor;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * @Author cuiJiaWang
+ * @Create 2025-02-06 10:36
+ */
+public class MyInterceptor implements HandlerInterceptor {
+    @Override
+    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
+        return true;
+    }
+
+    @Override
+    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
+        // 在视图渲染之前执行的逻辑
+    }
+
+    @Override
+    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
+        // 请求完成后的逻辑，比如资源清理
+    }
+}

src/main/java/stu/base/interceptor/WebConfig.java

@@ -0,0 +1,100 @@
+package stu.base.interceptor;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.format.FormatterRegistry;
+import org.springframework.http.converter.HttpMessageConverter;
+import org.springframework.validation.Validator;
+import org.springframework.web.method.support.HandlerMethodArgumentResolver;
+import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
+import org.springframework.web.servlet.HandlerExceptionResolver;
+import org.springframework.web.servlet.config.annotation.*;
+
+import java.util.List;
+
+/**
+ * @Author cuiJiaWang
+ * @Create 2025-02-06 10:54
+ */
+@Configuration
+public class WebConfig implements WebMvcConfigurer {
+    @Override
+    public void addFormatters(FormatterRegistry formatterRegistry) {
+
+    }
+
+    @Override
+    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
+//        //1.需要定义一个convert转换消息的对象;
+//        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
+//        //2.添加fastJson的配置信息，比如：是否要格式化返回的json数据;
+//        FastJsonConfig fastJsonConfig = new FastJsonConfig();
+//        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat,
+//                SerializerFeature.WriteMapNullValue,
+//                SerializerFeature.WriteNullStringAsEmpty,
+//                SerializerFeature.DisableCircularReferenceDetect,
+//                SerializerFeature.WriteNullListAsEmpty,
+//                SerializerFeature.WriteDateUseDateFormat);
+//        //3处理中文乱码问题
+//        List<MediaType> fastMediaTypes = new ArrayList<>();
+//        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
+//        //4.在convert中添加配置信息.
+//        fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes);
+//        fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);
+//        //5.将convert添加到converters当中.
+//        converters.add(fastJsonHttpMessageConverter);
+    }
+
+    @Override
+    public Validator getValidator() {
+        return null;
+    }
+
+    @Override
+    public void addArgumentResolvers(List<HandlerMethodArgumentResolver> list) {
+
+    }
+
+    @Override
+    public void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> list) {
+
+    }
+
+    @Override
+    public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> list) {
+
+    }
+
+    @Override
+    public void addInterceptors(InterceptorRegistry interceptorRegistry) {
+        interceptorRegistry.addInterceptor(new MyInterceptor())
+                .addPathPatterns("/**");
+    }
+
+    @Override
+    public void addViewControllers(ViewControllerRegistry viewControllerRegistry) {
+
+    }
+
+    @Override
+    public void addResourceHandlers(ResourceHandlerRegistry registry) {
+        registry.addResourceHandler("swagger-ui.html")
+                .addResourceLocations("classpath:/META-INF/resources/");
+
+        registry.addResourceHandler("/webjars/**")
+                .addResourceLocations("classpath:/META-INF/resources/webjars/");
+
+        registry.addResourceHandler("/swagger-resources/**")
+                .addResourceLocations("classpath:/META-INF/resources/swagger-resources/");
+
+        registry.addResourceHandler("/swagger/**")
+                .addResourceLocations("classpath:/META-INF/resources/swagger*");
+
+        registry.addResourceHandler("/v2/api-docs/**")
+                .addResourceLocations("classpath:/META-INF/resources/v2/api-docs/");
+    }
+
+    @Override
+    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer defaultServletHandlerConfigurer) {
+
+    }
+}

src/main/java/stu/base/interceptor/interceptor.md

@@ -0,0 +1,17 @@
+## Interceptor
+### 什么是 Interceptor
+Interceptor 是一种特殊的 Handler，它允许你拦截消息的传递，并做出一些自定义的处理，主要目的是为了减少重复代码，用于大量的程序预处理工作。
+
+`Interceptor`是 `Spring MVC` 框架的一部分，是位于`org.springframework.web.servlet`包中的`HandlerInterceptor`接口，用于在请求处理之前或之后执行特定逻辑。与`Filter`不同的是，`Interceptor`不依赖于`Servlet`容器，它是 Spring 框架独有的。
+
+
+### 执行顺序
+
+![图片](https://erism.oss-cn-hangzhou.aliyuncs.com/img/640)
+
+`postHandle` 是按照`Interceptor` 链**逆序执行**的
+
+
+
+![图片](https://mmbiz.qpic.cn/sz_mmbiz_jpg/Sibr1V72JEHGfYBl61CFeoEJiaXFKHb7dU6aTjqAXPm6VgJSS1ibq1icWMLojetf0GaVIKv8nk4cKz3FFpUKIDw6BQ/640)
+