如何在不使用文件的情况下将BufferedImage转换为字节数组 [英] How I can convert BufferedImage to a byte array without using files

问题描述

我试图将BufferedImage转换为字节数组，但是每次遇到异常时，我都会得到一个返回bufferImage的服务，这是我的代码:

I'm trying to convert a BufferedImage to an array of bytes but I get every time an exception I have a service that return a bufferImage ,this my code :

BufferedImage bufferedImage = myservice.getImage();
WritableRaster raster = bufferedImage.getRaster();
DataBufferByte data   = (DataBufferByte) raster.getDataBuffer();
 byte[] fileContent = data.getData();

此代码引发了异常:

java.lang.ClassCastException: java.awt.image.DataBufferInt cannot be cast to java.awt.image.DataBufferByte

如何在不使用文件的情况下进行转换

How I can do this conversion without using files

推荐答案

您可以使用ByteArrayOutputStream类，并使用以下代码从BufferedImage对象写入数据，

You can use ByteArrayOutputStream class and write data from BufferedImage object using following code,

BufferedImage image = null; // you have the data in this object
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(image, "fileformat like png or jpg", baos);
baos.flush();
byte[] imageInByte = baos.toByteArray(); // you have the data in byte array
baos.close();

所有这些都存储在内存中，无需使用任何磁盘io或写入文件.

And all of this just in memory without using any disk io or writing to files.

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