1.静态资源

2.测试

启动程序后访问：http://localhost:8080/test/img/timg.jpg

3.直接访问

如果直接访问：可以得到图片http://localhost:8080/img/timg.jpg ，但是这样做无疑暴露了真实的地址。

4.定义拦截器拦截/img/*

拦截器代码：

package com.qianliu.springboot_test.interceptor;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

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

@Component //@Component标签相当于配置文件中的<bean id="" class=""/>，以后可以直接放入到@Configuration标注的类中
public class SimpleIntercepter implements HandlerInterceptor {
    //获取日志
    private Logger logger = LoggerFactory.getLogger(this.getClass());

    /*
     * 进入controller层之前拦截请求
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //含有"/img/"的链接进行拦截
        if(request.getRequestURI().startsWith("/img/")){
            return false;
        }

        return true;
    }

    /*
     * 处理请求完成后视图渲染之前的处理操作
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        logger.info("postHandle..................");
    }

    /*
     * 视图渲染之后的操作
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        logger.info("afterCompletion...............");
    }
}

添加拦截器到配置文件中

package com.qianliu.springboot_test.interceptor.configuration;

import com.qianliu.springboot_test.interceptor.SimpleIntercepter;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import javax.annotation.Resource;

/*
 * @author qianliu on 2019/5/16 21:43
 * @Discription:注册SimpleIntercepter拦截器并注册拦截的url
 */
@Configuration //SimpleIntercepter相当于一个Bean，因为它被@Component标注过
public class UserInterceptorAppConfig implements WebMvcConfigurer {
    @Resource
    SimpleIntercepter simpleIntercepter;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(simpleIntercepter).addPathPatterns("/**"); //该拦截器使用在所有的url上
    }
}

5.测试

访问：http://localhost:8080/test/img/timg.jpg

访问：http://localhost:8080/img/timg.jpg

6.上传文件