SpringBoot2.0 base case (05): multiple interceptors to configure and use scenarios

I. Introduction interceptors

1, interceptors defined

Interceptors, before the request interface is accessed, and the intercept is added before or after certain operations. AOP intercept is an implementation strategy. It is mainly used to reject the request interceptor in accordance with specified rules.

2, interceptor application

Token令牌验证
请求数据校验
用户权限校验
放行指定接口

Two, SpringBoot2.0 blocker usage

1, write two interceptors

Custom class that implements the interface HandlerInterceptor
1) OneInterceptor interceptors

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 interceptor

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 configuration file inject interceptors

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, written test interface

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, test interface access

Log output as follows

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

Interceptor interceptor ordering, the order of execution is injected interceptor according Web profile.

Third, the source address

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