SpringBoot之自定义拦截器

一、自定义拦截器实现步骤

1、创建拦截器类并实现HandlerInterceptor接口

2、创建SpringMVC自定义配置类，实现WebMvcConfigurer接口中addInterceptors方法

3、将自定义拦截器类加入配置类

二、代码实现

自定义拦截器类：

public class MyInterceptor1 implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("MyInterceptor1 -> preHandle执行了");
        //true表示继续执行
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("MyInterceptor1 -> postHandle 执行了");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("MyInterceptor1 -> afterCompletion 执行了");
    }
}

配置类：

@Configuration
public class MVCConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //addPathPatterns添加拦截路径
        //excludePathPatterns添加不拦截路径
        registry.addInterceptor(new MyInterceptor1()).addPathPatterns("/test1/**").excludePathPatterns("/test2");
    }
}

创建控制器进行测试：

@RestController
public class InterceptorController {

    @RequestMapping("/test1/{name}")
    public String test1(@PathVariable("name") String name) {
        return "hi, " + name;
    }

    @RequestMapping("/test2")
    public String test2() {
        return "test2";
    }
}

 输入localhost:8080/test2

 控制台无输出即表示没有拦截

 输入localhost:8080/test1/jack

 控制台输出：