如何在java中将图像转换为字节数组? [英] how to convert image to byte array in java?

问题描述

我想将图像转换为字节数组，反之亦然.在这里，用户将输入图像的名称(.jpg)，程序将从文件中读取并将其转换为字节数组.

I want to convert an image to byte array and vice versa. Here, the user will enter the name of the image (.jpg) and program will read it from the file and will convert it to a byte array.

推荐答案

BufferedImage 包含两个主要类:Raster &颜色模型.光栅本身由两个类组成，DataBufferByte 用于图像内容，另一个用于像素颜色.

BufferedImage consists of two main classes: Raster & ColorModel. Raster itself consists of two classes, DataBufferByte for image content while the other for pixel color.

如果你想要来自 DataBufferByte 的数据，使用:

if you want the data from DataBufferByte, use:

public byte[] extractBytes (String ImageName) throws IOException {
 // open image
 File imgPath = new File(ImageName);
 BufferedImage bufferedImage = ImageIO.read(imgPath);

 // get DataBufferBytes from Raster
 WritableRaster raster = bufferedImage .getRaster();
 DataBufferByte data   = (DataBufferByte) raster.getDataBuffer();

 return ( data.getData() );
}

现在您可以通过在 lsb 中隐藏文本来处理这些字节，或者按照您想要的方式进行处理.

now you can process these bytes by hiding text in lsb for example, or process it the way you want.

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