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、url==http://127.0.0.1:8005/reqUrl

intercept.TwoInterceptor : 2、url==http://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·地址

https://github.com/cicadasmile/spring-boot-base

GitEE·地址

https://gitee.com/cicadasmile/spring-boot-base

巴特西

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

2、拦截器中应用

二、SpringBoot2.0拦截器用法

1、编写两个拦截器

2、Web配置文件中注入拦截器

3、编写测试接口

4、访问测试接口

三、源代码地址

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