如何提取的Thumbs.db图像的Java？ [英] How to extract images from Thumbs.db in Java?

问题描述

HI
我读到POI项目，并试图提取code，从图像的Thumbs.db，但得到的异常.. code OS

HI I read about POI project and tried to extract images from thumbs.db but getting exception in code .. Code os

InputStream stream = new FileInputStream("C:\\Thumbs.db");
POIFSFileSystem fs = new POIFSFileSystem(stream);
DirectoryEntry root = fs.getRoot();
Entry entry = root.getEntry("2");
DocumentInputStream is = fs.createDocumentInputStream(entry.getName());
JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(is);
JPEGDecodeParam param = JPEGCodec.getDefaultJPEGEncodeParam(4,    JPEGDecodeParam.COLOR_ID_RGBA);
decoder.setJPEGDecodeParam(param);
BufferedImage originalBufferedImage = decoder.decodeAsBufferedImage();

获取例外，因为com.sun.image codec.jpeg.ImageFormatException：不是一个JPEG文件：用0×00的0x0C开始

Getting exception as "com.sun.image.codec.jpeg.ImageFormatException: Not a JPEG file: starts with 0x0c 0x00"

什么是上述情况的问题？
你可以建议一些其他的方式做上述任务？

What is problem with above case ? Can you suggest some other way to do above task ?

推荐答案

您需要读取Thumbs.db文件的标题，然后才能开始提取图像。试着用我在下面加了变化，就应该删除 ImageFormatException 你得到。

You need to read the header of the Thumbs.db file before you can start extracting the images. Try with the changes I added below, it should remove the ImageFormatException you are getting.

InputStream stream = new FileInputStream("C:\\Thumbs.db");
POIFSFileSystem fs = new POIFSFileSystem(stream);
DirectoryEntry root = fs.getRoot();
Entry entry = root.getEntry("2");
DocumentInputStream is = fs.createDocumentInputStream(entry.getName());

//Added to read the header lines and fix the ImageFormatException
int header_len = is.read();
for (int i = 1; i < header_len; i++) {
        is.read();
}

JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(is);
JPEGDecodeParam param = JPEGCodec.getDefaultJPEGEncodeParam(4,JPEGDecodeParam.COLOR_ID_RGBA);
decoder.setJPEGDecodeParam(param);
BufferedImage originalBufferedImage = decoder.decodeAsBufferedImage();

我希望帮助！

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