首先我们创建Interceptor，实现HandlerInterceptor覆写方法：
一、下面我创建了三个拦截器：
MyInterceptor，UserInterceptor，StudentInterceptor

@Component
public class MyInterceptor implements HandlerInterceptor {

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("MyInterceptor preHandle");
return true;
}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("MyInterceptor postHandle");
}

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("MyInterceptor afterCompletion");
}
}

@Component
public class StudentInterceptor implements HandlerInterceptor {

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("StudentInterceptor preHandle");
return true;
}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("StudentInterceptor postHandle");

}

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("StudentInterceptor afterCompletion");

}
}

@Component
public class UserInterceptor implements HandlerInterceptor {

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

System.out.println("UserInterceptor preHandle");
return true;
}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("UserInterceptor postHandle");
}

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("UserInterceptor afterCompletion");
}
}

二、把拦截器加入到拦截器队列 实现WebMvcConfigurer

@Configuration
public class MyAdapter implements WebMvcConfigurer {

@Resource
private MyInterceptor myInterceptor;

@Resource
private UserInterceptor userInterceptor;

@Resource
private StudentInterceptor studentInterceptor;

@Override
public void addInterceptors(InterceptorRegistry registry) {
//1.加入的顺序就是拦截器执行的顺序，
//2.按顺序执行所有拦截器的preHandle
//3.所有的preHandle 执行完再执行全部postHandle 最后是postHandle
registry.addInterceptor(studentInterceptor).addPathPatterns("/**");
registry.addInterceptor(myInterceptor).addPathPatterns("/**");
registry.addInterceptor(userInterceptor).addPathPatterns("/**");

}
}

三、最后访问controller

@RestController
public class TestController {

@RequestMapping("/test")
public String test() {
return "test";
}

}

 

 

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原文链接：https://blog.csdn.net/weixin_38362455/article/details/85029748