无法打开从 Android 发送到我的 Intellij 服务器的 Base64 编码图像

Question

保存图像后我就看不到它了。

我的Android项目中的Image to Base64方法

public String image2String(ImageView im) {
        Bitmap bitmap = ((BitmapDrawable) im.getDrawable()).getBitmap();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 90, baos);
        byte[] bytes = baos.toByteArray();
        return Base64.encodeToString(bytes, Base64.DEFAULT);
    }

Intellij中服务器端写入文件夹的方法

try {
            byte[] imageByteArray = java.util.Base64.getMimeDecoder().decode(img);
            FileOutputStream stream = new FileOutputStream("C:\\Users\\Lau\\Desktop\\Folder\\test.jpg");
            stream.write(imageByteArray);
            stream.close();
        } catch (Exception e) {
            return false;
        }

没有抛出异常，但无法打开文件夹中的文件。

image2String

返回以下值：
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虽然我在服务器上收到的字符串是这样的：

"/9j/4AAQSkZJRgABAQAAAQABAAD/4gIoSUNDX1BST0ZJTEUAAQEAAAIYAAAAAAIQAABtbnRyUkdC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\n"

在服务器中

imageByteArray

的长度为2994字节，我文件夹中的文件为2,92 KB（2.994字节）。

Answer 1

编辑：更好的方法

我们应该以这种方式在 Android 中编码，而不是在服务器中编辑字符串

Base64.encodeToString(bytes, Base64.NO_WRAP);

并以通常的方式将其获取到服务器中，而无需编辑字符串

java.util.Base64.getMimeDecoder().decode(yourByteArray);

以前的方式：

我只需编辑我在服务器中获取的字符串，方法是删除它周围的引号

img.substring(1, img.length() - 1)

和 与

img.replace("\\n", "")

。

服务器中的结果代码是这样的：

String fixed = img.substring(1, img.length() - 1).replace("\\n", "");
byte[] imageByteArray = java.util.Base64.getMimeDecoder().decode(fixed);
FileOutputStream stream = new FileOutputStream("C:\\Users\\Lau\\Desktop\\Folder\\test.jpg");
stream.write(imageByteArray);
stream.close();

特别感谢@jps