Java从字节数组获取图像扩展 [英] Java get image extension from byte array

问题描述

我有以下代码，用于保存字节数组中的图像.

I have the below code for saving an image from a byte array.

我可以使用以下代码成功保存图像.

I am able to save the image successfully using the below code.

当前，我正在保存".png"格式的图像，但我想从字节数组中获取图像扩展名并使用该扩展名保存图像.

Currently I am saving image with ".png" format but I want to get the image extension from byte array and save image with this extension.

这是我的代码

public boolean SaveImage(String imageCode) throws Exception {
    boolean status = false;
    Connection dbConn = null;
    CallableStatement callableStatement = null;
    try {
        String base64Image = imageCode.split(",")[1];
        byte[] imageBytes = javax.xml.bind.DatatypeConverter.parseBase64Binary(base64Image);

        Properties propFile = LoadProp.getProperties();
        String filepath = propFile.getProperty(Constants.filepath);
        File file = new File(filepath + "xyz.png");
        FileOutputStream fos = new FileOutputStream(file);
        try {
            fos.write(imageBytes);
        } finally {
            fos.close();
        }
    } catch (Exception e) {
        throw e;
    } finally {
        if (callableStatement != null) {
            callableStatement.close();
        }
        if (dbConn != null) {
            dbConn.close();
        }
    }
    return status;
}

我正在使用Java和Tomcat 8.

I am using Java and Tomcat 8.

推荐答案

有很多解决方案.例如，非常简单:

There are many solutions. Very simple for example:

String contentType = URLConnection.guessContentTypeFromStream(new ByteArrayInputStream(imageBytes));

或者您可以使用第三方库.像 Apache Tika :

Or you can use third-party libraries. Like Apache Tika:

String contentType = new Tika().detect(imageBytes);

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