在SpringBoot中使用拦截器

╰+哭是因爲堅強的太久メ 2022-07-12 12:47 162阅读 0赞

**在 SpringBoot中使用拦截器**

拦截器接口 HandlerInterceptor

public interface HandlerInterceptor { 
    
    
        boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
                throws Exception;
    
    
        void postHandle(
                HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)
                throws Exception;
    
    
        void afterCompletion(
                HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
                throws Exception;
    
    }

实现自定义的拦截器需要实现HandlerInterceptor接口

例如：LogHandlerInteceptor

public class LogHandlerInterceptor implements HandlerInterceptor { 
    
        /** * controller 执行之前调用 */
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
                throws Exception {
            System.out.println("------preHandle-----");
            return true;
        }
    
        /** * controller 执行之后，且页面渲染之前调用 */
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                ModelAndView modelAndView) throws Exception {
            System.out.println("------postHandle-----");
        }
    
        /** * 页面渲染之后调用，一般用于资源清理操作 */
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
                throws Exception {
            System.out.println("------afterCompletion-----");
    
        }
    
    }

**注册拦截器**

@Configuration
    public class MyWebConfig extends WebMvcConfigurerAdapter{ 
    
        /** * 注册 拦截器 */
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            registry.addInterceptor(new LogHandlerInterceptor());
        }
    
    }

测试：

UserController

@RestController
    public class UserController {
    
        @GetMapping("/user/home")
        public String home(){
            System.out.println("--- user home ---");
            return "user home";
        }
    
    }

![这里写图片描述][SouthEast]

![这里写图片描述][SouthEast 1]

[SouthEast]: /images/20220710/0a3ef4080eb947dcb14b68251982c86c.png
[SouthEast 1]: /images/20220710/28650c2dad284cbabca983fb0a02f32f.png