SpringBoot添加拦截器
拦截器也是我们经常需要使用的,在SpringBoot中该如何配置呢?
拦截器不是一个普通属性,而是一个类,所以就要用到java配置方式了。在SpringBoot官方文档中有这么一段说明:
If you want to keep Spring Boot MVC features and you want to add additional MVC configuration (interceptors, formatters, view controllers, and other features), you can add your own
@Configuration
class of typeWebMvcConfigurer
but without@EnableWebMvc
. If you wish to provide custom instances ofRequestMappingHandlerMapping
,RequestMappingHandlerAdapter
, orExceptionHandlerExceptionResolver
, you can declare aWebMvcRegistrationsAdapter
instance to provide such components.If you want to take complete control of Spring MVC, you can add your own
@Configuration
annotated with@EnableWebMvc
.
翻译:
如果你想要保持Spring Boot 的一些默认MVC特征,同时又想自定义一些MVC配置(包括:拦截器,格式化器, 视图控制器、消息转换器 等等),你应该让一个类实现
WebMvcConfigurer
,并且添加@Configuration
注解,但是千万不要加@EnableWebMvc
注解。如果你想要自定义HandlerMapping
、HandlerAdapter
、ExceptionResolver
等组件,你可以创建一个WebMvcRegistrationsAdapter
实例 来提供以上组件。
如果你想要完全自定义SpringMVC,不保留SpringBoot提供的一切特征,你可以自己定义类并且添加@Configuration
注解和@EnableWebMvc
注解
首先我们定义一个拦截器:
@Component
//继承HandlerInterceptor
public class MyInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("preHandle method is running!");
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("postHandle method is running!");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("afterCompletion method is running!");
}
}
然后定义配置类,注册拦截器:
@Configuration
//实现`WebMvcConfigurer`,并且添加`@Configuration`注解
public class MvcConfiguration implements WebMvcConfigurer {
//注入定义的拦截器
@Autowired
private HandlerInterceptor myInterceptor;
/**
* 重写接口中的addInterceptors方法,添加自定义拦截器
* @param registry
*/
@Override
public void addInterceptors(InterceptorRegistry registry) {
/*拦截路径*/ registry.addInterceptor(myInterceptor).addPathPatterns("/**");
}
}
接下来运行并查看日志:
preHandle method is running!
postHandle method is running!
afterCompletion method is running!
你会发现日志中只有这些打印信息,springMVC的日志信息都没有,因为springMVC记录的log级别是debug,springboot默认是显示info以上,我们需要进行配置。
SpringBoot通过logging.level.*=debug
来配置日志级别,*填写包名
# 设置org.springframework包的日志级别为debug
logging.level.org.springframework=debug