SpringBoot2.X (二十): Spring Boot 自定义Intercepter

川长思鸟来 2022-05-13 01:18 258阅读 0赞

在SpringBoot1.X 中，使用拦截器， 一般会继承 *`WebMvcConfigurerAdapter`* 类，如下图所示：

![这里写图片描述][70]

但是在 SpringBoot2.X 中 ，`WebMvcConfigurerAdapter` 被deprecated ， 更好的做法是 implements `WebMvcConfigurer`

1、拦截器统一管理

package com.fxbin.demo.config;
    
    import com.fxbin.demo.interceptor.MyInterceptor;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    /**
     * created with IntelliJ IDEA.
     * author: fxbin
     * date: 2018/9/9
     * time: 14:46
     * description:
     */
    @Configuration
    public class WebConfig implements WebMvcConfigurer {
    
        @Bean
        public MyInterceptor myInterceptor(){
            return new MyInterceptor();
        }
    
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            //添加拦截路径和排除拦截路径
            registry.addInterceptor(myInterceptor()).addPathPatterns("/**").excludePathPatterns("/test");
        }
    }

2、自定义拦截器

package com.fxbin.demo.interceptor;
    
    import org.springframework.stereotype.Component;
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /**
     * created with IntelliJ IDEA.
     * author: fxbin
     * date: 2018/9/9
     * time: 14:48
     * description:
     */
    @Component
    public class MyInterceptor implements HandlerInterceptor {
    
        /**
         * 进入controller层之前拦截请求
         * @param request
         * @param response
         * @param handler
         * @return
         */
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
            System.out.println("getContextPath:" + request.getContextPath());
            System.out.println("getServletPath:" + request.getServletPath());
            System.out.println("getRequestURI:" + request.getRequestURI());
            System.out.println("getRequestURL:" + request.getRequestURL());
            System.out.println("getRealPath:" + request.getSession().getServletContext().getRealPath("image"));
            return true;
        }
    
    
        /**
         * 处理请求完成后视图渲染之前的处理操作
         * @param request
         * @param response
         * @param handler
         * @param modelAndView
         */
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
    
        }
    
        /**
         * 视图渲染之后的操作
         * @param request
         * @param response
         * @param handler
         * @param ex
         */
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
    
        }
    }

3、测试  
由于我们设置了`URI` 是 `/test` 的话，会被跳过，所以先测试 http://localhost:8080/test 是否可以通过拦截器

![这里写图片描述][70 1]

测试通过，而 其它请求则会进入拦截器， 并且打印我们所期望的一些信息：  
![这里写图片描述][70 2]

[70]: /images/20220513/3c323cd95fa54be0ba3a8024e3471f2e.png
[70 1]: /images/20220513/749fcdb5491f41af846cbbef8c1321ee.png
[70 2]: /images/20220513/9449afee542a4524a488e240a9efebea.png