postgre存储bytea(blob)

Posted 2021-06-27 小黄鸡1992

conrtoller

public Result<SysImageVO> uploadImg(SysImageVO sysImageVO, MultipartFile imgFile) throws IOException {
        Result<SysImageVO> result = new Result<>();
        sysImageVO.setContent(imgFile.getBytes());
        sysImageService.uploadImg(sysImageVO);
        return result;
    }


    public Result downloadImg(SysImageVO sysImageVO, HttpServletResponse response) throws IOException {
        Result result = new Result();
        // 业务处理
        SysImageVO image = sysImageService.downloadImg(sysImageVO);
        // 将content转化
        byte[] content = (byte[]) image.getContent();
        // 设置文件名
        response.addHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(image.getName(), "UTF-8") + ";");
        // 设置文件大小
        response.setContentLength(Integer.parseInt(image.getSize()));
        // 将图片流通过response对象返回
        BufferedOutputStream bos = new BufferedOutputStream(response.getOutputStream());
        bos.write(content);
        bos.close();
        return result;
    }

entity

private Object content; //二进制流

mapper

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.vanpeng.resource.business.modular.image.dao.SysImageDao">
        <resultMap type="xx.entity.ImageVO" id="ImageMap">
        <result property="id" column="id" jdbcType="INTEGER"/>
        <result property="name" column="name" jdbcType="VARCHAR"/>
        <result property="content" column="content" jdbcType="BLOB"/> //bytea
    </resultMap>

    <!--新增图片-->
    <insert id="uploadImg">
        insert into sys_image(id, name, content)
        values (#{id, jdbcType=INTEGER},#{name, jdbcType=VARCHAR}, #{content})
    </insert>

    <!--下载图片-->
    <select id="getImgById" resultMap="ImageMap">
        select
        id, name, content
        from sys_image
        where id = #{id}
    </select>
</mapper>

seriver不多说 对象传递即可