mongodb - 如何将图像保存在字节数组中并将字节数组返回到 grails 中的图像中？

Question

我想将图像保存在字节数组中..并保存到 mongoDb 数据库中..并将字节数组取回图像文件并显示到 .GSP 页面

领域

class Profile{
    static mapWith = "mongo"

    String firstname
    String lastname
    byte[] imgpath
}

控制器

def saveimage{
    File filepath = new File("C:\\man-of-steel-theme.jpg");


   def encodedData = filepath.bytes;
   profile.imgpath=encodedData;
   profile.save();
}

在此不确定是否将正确的字节数组保存到 mongodb 并且无法获取图像文件

Answer 1

也许这对你有帮助

    import java.awt.Graphics2D
    import java.awt.image.BufferedImage

    import javax.imageio.ImageIO
    import javax.imageio.stream.ImageInputStream
    import javax.imageio.stream.MemoryCacheImageInputStream

    class xyzClass {
        def zabcdef(){
            org.springframework.web.multipart.commons.CommonsMultipartFile multipartfile = request.getFile('picture')
            if (!multipartfile || multipartfile.getContentType() != 'image/jpeg') {
                render("${message(code:'error.wrong.file.type')}: jpeg")
                return;
            }

            ImageInputStream iis = new MemoryCacheImageInputStream(multipartfile.getInputStream())
            BufferedImage image = ImageIO.read(iis)

            storeImage(image,"foto")
        }

    }



    private storeImage(BufferedImage image, String name) {
        ByteArrayOutputStream os = new ByteArrayOutputStream()
        ImageIO.write(image, "jpg", os)
        byte[] buf = os.toByteArray()
        InputStream is = new ByteArrayInputStream(buf)
        //store
    }