SpringBoot2.0 基础案例(05)：多个拦截器配置和使用场景

本文源码
GitHub:知了一笑
https://github.com/cicadasmile/spring-boot-base

1、拦截器简介

一、拦截器定义

拦截器，请求的接口被访问以前，进行拦截而后在以前或以后加入某些操做。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。

二、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

2、SpringBoot2.0拦截器用法

一、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("一、url=="+url);
 // 放开拦截
 return true;
 }
 @Override
 public void postHandle(HttpServletRequest httpServletRequest,
 HttpServletResponse httpServletResponse,
 Object o, ModelAndView modelAndView) throws Exception {
 LOGGER.info("一、postHandle");
 }
 @Override
 public void afterCompletion(HttpServletRequest httpServletRequest,
 HttpServletResponse httpServletResponse,
 Object o, Exception e) throws Exception {
 LOGGER.info("一、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("二、url=="+url);
 // 放开拦截
 return true;
 }
 @Override
 public void postHandle(HttpServletRequest httpServletRequest,
 HttpServletResponse httpServletResponse,
 Object o, ModelAndView modelAndView) throws Exception {
 LOGGER.info("二、postHandle");
 }
 @Override
 public void afterCompletion(HttpServletRequest httpServletRequest,
 HttpServletResponse httpServletResponse,
 Object o, Exception e) throws Exception {
 LOGGER.info("二、afterCompletion");
 }
}

二、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
 */
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
 public void addInterceptors(InterceptorRegistry registry) {
 // 拦截全部路径
 // 注册自定义两个拦截器
 registry.addInterceptor(new OneInterceptor()).addPathPatterns("/**");
 registry.addInterceptor(new TwoInterceptor()).addPathPatterns("/**");
 }
}

三、编写测试接口

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

四、访问测试接口

日志输出内容以下

intercept.OneInterceptor : 一、url==http://127.0.0.1:8005/reqUrl
intercept.TwoInterceptor : 二、url==http://127.0.0.1:8005/reqUrl
intercept.TwoInterceptor : 二、postHandle
intercept.OneInterceptor : 一、postHandle
intercept.TwoInterceptor : 二、afterCompletion
intercept.OneInterceptor : 一、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。

3、源代码地址

GitHub地址：知了一笑
https://github.com/cicadasmile/spring-boot-base
码云地址：知了一笑
https://gitee.com/cicadasmile/spring-boot-base