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目录

1、MyInterceptor1

2、UserController

3、MvcConfig，拦截器4种拦截方法策略

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做请求的校验，如果校验没有通过，直接返回，原来下面的处理，就不用处理了
将request进行拦截校验
将response进行拦截校验

preHandle 在请求处理之前调用

postHandler 是在回应以后

afterCompletion 是在最后调用

1、MyInterceptor1

package cn.tedu._06interceptor.interceptor;import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/*** 拦截指定请求** */
public class MyInterceptor1 implements HandlerInterceptor {/*** 一般做权限校验** retrun 是否放行，false则直接结束，请求结束* */@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {System.out.println("MyInterceptor1 第一个拦截器拦截 1、preHandle");return true;
//        return HandlerInterceptor.super.preHandle(request, response, handler);}/*** 可以做敏感词过滤* ModelAndView 模型数据* */@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
//        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);System.out.println("MyInterceptor1 第一个拦截器拦截 2、postHandle");}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
//        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);System.out.println("MyInterceptor1 第一个拦截器拦截 3、afterCompletion");}
}

2、UserController

package cn.tedu._06interceptor.controller;import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;@RestController
@RequestMapping(value = "/v1/users/")
public class UserController {@GetMapping("login")public String login() {return "登录成功";}@GetMapping("reg")public String reg() {return "注册成功";}
}

3、MvcConfig，拦截器4种拦截方法策略

package cn.tedu._06interceptor.config;import cn.tedu._06interceptor.interceptor.MyInterceptor1;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configuration
public class MvcConfig implements WebMvcConfigurer {@Overridepublic void addInterceptors(InterceptorRegistry registry) {
//        注册拦截器：
//        1、策略1，拦截所有请求
//        registry.addInterceptor(new MyInterceptor1());//        2、策略2：拦截指定请求，比如：拦截登录请求
//        执行登录接口的时候，会打印拦截器日志
//        registry.addInterceptor(new MyInterceptor1())
//                .addPathPatterns("/v1/users/login");//        3、策略3：拦截指定多个请求，比如拦截用户模块请求
//        registry.addInterceptor(new MyInterceptor1())
//                .addPathPatterns("/v1/users/**");//        4、策略4：拦截用户模块中，除了登录功能以外的所有请求，registry.addInterceptor(new MyInterceptor1()).addPathPatterns("/v1/users/**").excludePathPatterns("/v1/users/login");}
}