Springboot+MybatisPlus实现从数据库保存的路径下载文件（2）

还是用上次文件上传的数据库测试

 文件上传：

Springboot+MybatisPlus实现文件上传到服务器并保存路径到数据库（1）_HackAzrael的专栏-优快云博客首先建立测试用的数据库CREATE TABLE `file` ( `id` bigint NOT NULL COMMENT '主键', `filename` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '文件名', `filepath` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULThttps://blog.youkuaiyun.com/HackAzrael/article/details/120984636

pom依赖

<dependencies>
        <!--springboot整合web项目-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!--mybatis plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter<