在springboot中添加攔截器

1、首先定義一個攔截器

package com.leyou.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;

/**
 * @author houChen        攔截器在攔截之前 中 與之后的處理事件
 * @date 2020/5/14 20:25
 * @Description:
 */
public class LoginInterceptor implements HandlerInterceptor {

    private Logger logger = LoggerFactory.getLogger(LoginInterceptor.class);
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        logger.debug("preHandle method is now running!");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
        logger.debug("postHandle method is now running!");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
        logger.debug("afterCompletion method is now running!");
    }
}

2、定義配置類，注冊攔截器

package com.leyou.config;

import com.leyou.interceptor.LoginInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * @author houChen
 * @date 2020/5/14 20:26
 * @Description:
 */
@Configuration
public class MvcConfig implements WebMvcConfigurer {
    /**
     * 通過@Bean注解，將我們定義的攔截器注冊到Spring容器
     * @return
     */
    @Bean
    public LoginInterceptor loginInterceptor(){
        return new LoginInterceptor();
    }

    /**
     * 重寫接口中的addInterceptors方法，添加自定義攔截器
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 通過registry來注冊攔截器，通過addPathPatterns來添加攔截路徑 
        registry.addInterceptor(this.loginInterceptor()).addPathPatterns("/hello"); //這里表示對所有/hello的路徑進行攔截
    }
}

3、效果如下