SpringBoot2 综合案例(04):多个拦截器配置和使用场景

Spring Boot 2 基础案例篇

包含：入门、日志管理、定时器、事务、AOP、数据库、缓存、NoSQL、监控、打包。

Spring Boot 2 高级案例篇

包含：整合常用中间件：分库分表、权限管理、Redis 集群、Dubbo、消息队列、定时器、搜索引擎、文件管理、邮件等

拦截器简介 拦截器定义

拦截器，请求的接口被访问之前，进行拦截然后在之前或之后加入某些操作。拦截是 AOP 的一种实现策略。 拦截器主要用来按照指定规则拒绝请求。

拦截器中应用

Token 令牌验证请求数据校验用户权限校验放行指定接口

SpringBoot2.0 拦截器用法 编写两个拦截器

自定义类实现 HandlerInterceptor 接口

1）OneInterceptor 拦截器

import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * 拦截器一 */public class OneInterceptor implements HandlerInterceptor { private static final Logger LOGGER = LoggerFactory.getLogger(OneInterceptor.class.getName()); @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception { String url =String.valueOf(request.getRequestURL()) ; LOGGER.info("1、url=="+url); // 放开拦截 return true; } @Override public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception { LOGGER.info("1、postHandle"); } @Override public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception { LOGGER.info("1、afterCompletion"); }}

2）TwoInterceptor 拦截器

import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * 拦截器二 */public class TwoInterceptor implements HandlerInterceptor { private static final Logger LOGGER = LoggerFactory.getLogger(TwoInterceptor.class.getName()); @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception { String url =String.valueOf(request.getRequestURL()) ; LOGGER.info("2、url=="+url); // 放开拦截 return true; } @Override public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception { LOGGER.info("2、postHandle"); } @Override public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception { LOGGER.info("2、afterCompletion"); }}

Web 配置文件中注入拦截器

import com.boot.intercept.intercept.OneInterceptor;import com.boot.intercept.intercept.TwoInterceptor;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.InterceptorRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;/** * Web 配置文件 */@Configurationpublic class WebMvcConfig implements WebMvcConfigurer { public void addInterceptors(InterceptorRegistry registry) { // 拦截所有路径 // 注册自定义两个拦截器 registry.addInterceptor(new OneInterceptor()).addPathPatterns("/**"); registry.addInterceptor(new TwoInterceptor()).addPathPatterns("/**"); }}

编写测试接口

import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class InterceptController { @RequestMapping("/reqUrl") public String reqUrl (){ return "success" ; }}

访问测试接口

日志输出内容如下

intercept.OneInterceptor : 1、url==http://127.0.0.1:8005/reqUrlintercept.TwoInterceptor : 2、url==http://127.0.0.1:8005/reqUrlintercept.TwoInterceptor : 2、postHandleintercept.OneInterceptor : 1、postHandleintercept.TwoInterceptor : 2、afterCompletionintercept.OneInterceptor : 1、afterCompletionla

拦截器的拦截顺序，是按照 Web 配置文件中注入拦截器的顺序执行的。

源代码地址

GitHub·地址https://github.com/cicadasmile/spring-boot-baseGitEE·地址https://gitee.com/cicadasmile/spring-boot-base

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