在springboot中使用拦截器有两个步骤:
1、自定义拦截器类,实现HandlerInterceptor接口
2、注册拦截器
自定义拦截器类
public class MyInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("preHandle");
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("postHandle");
}
@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 MvcConfig implements WebMvcConfigurer {
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(myInterceptor()).addPathPatterns("/**"); //拦截所路径
}
@Bean
MyInterceptor myInterceptor(){
return new MyInterceptor();
}
}
当然,如果有多个拦截器也可以注册多个。
测试
创建一个controller:
@RestController
public class HelloController {
@RequestMapping("/hello")
public String hello(){
return "hello";
}
}
控制台输出如下: