SpringBoot2.0 基础案例(05)：多个拦截器配置和使用场景

一、拦截器简介
1、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。

2、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
二、SpringBoot2.0拦截器用法
1、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”);
  }
  }
  2、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) {
  // 拦截所有路径
  // 注册自定义两个拦截器
  registry.addInterceptor(new OneInterceptor()).addPathPatterns("/");
  registry.addInterceptor(new TwoInterceptor()).addPathPatterns("/");
  }
  }
  3、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” ;
  }
  }
  4、访问测试接口
  日志输出内容如下

intercept.OneInterceptor : 1、urlhttp://127.0.0.1:8005/reqUrl
intercept.TwoInterceptor : 2、urlhttp://127.0.0.1:8005/reqUrl
intercept.TwoInterceptor : 2、postHandle
intercept.OneInterceptor : 1、postHandle
intercept.TwoInterceptor : 2、afterCompletion
intercept.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。

三、源代码地址
GitHub：知了一笑
https://github.com/cicadasmile/spring-boot-base
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