第一步：書寫一個類

package com.lpy.controller.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class MiniInterceptor implements HandlerInterceptor {
	/**
	 * 攔截請求，在controller呼叫之前
	 */
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		if(true) {
			System.out.println("請求攔截");
			return false;
		}
		/**
		 * 返回false：請求被攔截，返回
		 * 返回true：請求ok，可以繼續執行，放行
		 */
		return true;
	}
	/**
	 * 請求controller之後，渲染檢視之前
	 */
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		// TODO Auto-generated method stub

	}
	/**
	 * 請求controller之後，渲染檢視之後
	 */
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		// TODO Auto-generated method stub

	}

}
 

第二步：書寫配置

package com.lpy;

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.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
/**
 * 以前spring配置實在xml裡面，現在springboot配置實在java類裡面
 * @author Richard
 *
 */

import com.lpy.controller.interceptor.MiniInterceptor;
@Configuration
public class WebMvcConfig extends WebMvcConfigurerAdapter {
	/**
	 * 顯示圖片的配置，我們的個人資訊的頭像
	 * @author Richard
	 * 可以直接通過http://localhost:8082/181127743X140568/face/wx3ce7c79e96132bd8.o6zAJs-h4oiS8tWZhwsiPN2jEeD8.3LCbAy49NFap02319d110a7896da0e48d2c34a1259d6.JPG
	 *訪問圖片
	 */
	@Override
	public void addResourceHandlers(ResourceHandlerRegistry registry) {
		registry.addResourceHandler("/**")
				.addResourceLocations("classpath:/META-INF/resources/") //解決swagger2的訪問,注意後面多了一個斜線
		        .addResourceLocations("file:D:\\java_all\\workspace-wxxcs\\video-space\\");
	}
	
	@Bean
	public MiniInterceptor miniInterceptor() {
		
		return new MiniInterceptor();
	}

	@Override
	public void addInterceptors(InterceptorRegistry registry) {
		//將攔截器註冊進去了
		registry.addInterceptor(miniInterceptor()).addPathPatterns("/user/**");
		super.addInterceptors(registry);
	}
	
	
}