SpringBoot拦截器简单实现

骑猪看日落 2024-04-23 21:17 5阅读 0赞

*  创建拦截器实现类

package com.example.helloworld.fAh;
    
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    public class InterceptorDemo implements HandlerInterceptor {
        
        @Override
        public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        
            System.out.printf("preHandle被调用\n");
            return true;
        }
    
        //请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后）
        @Override
        public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        
            System.out.println("postHandle被调用\n");
        }
    
        //在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作）
        @Override
        public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        
            System.out.println("afterCompletion被调用\n");
        }
    
    }

*  创建配置类，注册拦截器

package com.example.helloworld.config;
    
    import com.example.helloworld.fAh.InterceptorDemo;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    @Configuration
    public class HandlerConfig implements WebMvcConfigurer {
        
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
        
            registry.addInterceptor(new InterceptorDemo()).addPathPatterns("/**").excludePathPatterns("/a.do");
        }
    
    }