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Spring Boot注册拦截器Interceptor Spring MVC提供了AOP风格的拦截器，拥有更加精细的拦截器处理能力。Spring Boot中拦截器的注册更加方便，步骤如下：spring-boot-starter-web创建拦截器，实现HandlerInterceptor配置拦截器，定义配置类进行拦截器的配置增加依赖<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>实现HandlerInterceptor代码如下：public class MyInterceptor implements HandlerInterceptor { private final Logger logger = LoggerFactory.getLogger(MyInterceptor.class); /** * 方法执行前运行 * 必须返回true，后面的方法才能执行 * @param request * @param response * @param handler * @return * @throws Exception */ @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { logger.info("我先执行"); return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { logger.info("我在controller方法之后执行"); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { logger.info("我最后执行"); } }配置拦截器@Configuration public class MyWebMvcConfig implements WebMvcConfigurer { /** * 拦截器 * * @param registry registry */ @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new MyInterceptor()) //配置拦截的路由 .addPathPatterns("/interceptor/**") //配置不拦截的路由 .excludePathPatterns("/demo/**") //配置顺序 .order(1); } }测试定义controller测试我们的拦截器@RestController @RequestMapping("interceptor") public class InterceptorController { private final Logger logger = LoggerFactory.getLogger(InterceptorController.class); @GetMapping("/test") public String testInterceptor(){ logger.info("我是controller方法"); return "success"; } }通过调用http://localhost:8080/interceptor/test查看输出日志。[line]温馨提示[/line]拦截器按照preHandle→Controller→postHandle→afterHandle的顺序执行。只有preHandle方法返回true时，后面的方法才会执行。当拦截器链内存在多个拦截器时，postHandle在拦截器链内所有拦截器返回成功时才会调用。当拦截器链内存在多个拦截器时，afterHandle在拦截器链内所有拦截器返回true时才会调用。当拦截器链内存在多个拦截器时，如果第一个拦截器的preHandle方法返回false，则后面的方法都不会执行。调用controller方法时，只要配置了拦截的路由，哪怕前端请求404，仍然会调用preHandle、postHandle及afterHandle的方法。如果我们设置了order，代码如下：/** * 拦截器 * * @param registry registry */ @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new MyInterceptor2()) //配置拦截的路由 .addPathPatterns("/interceptor/**") //配置不拦截的路由 .excludePathPatterns("/demo/**") //配置顺序 .order(200); registry.addInterceptor(new MyInterceptor1()) //配置拦截的路由 .addPathPatterns("/interceptor/**") //配置不拦截的路由 .excludePathPatterns("/demo/**") //配置顺序 .order(300); }
