根据xml中存储的数据创建文件

Question

I really don't know how to describe this properly. I have a XML file with files in following format (it's a part of a jpg file):
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What is this "format" called (I need to google properly)? I tried to copy this text into a textfile and naming it "MyPicture.jpg", but I couldn't open it. Isn't it possible to retrieve a file like that? Do I have to change the encoding?

In the next step I wanna use a StreamWriter using java, to restore the files. Anything that I have to take care of, by doing that?

Answer 1

Most likely base64 content, so try this and ensure you copy all of the data into the base64Content variable...

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.io.IOUtils;

String base64Content = "mF1vmzAUhu8n7T8g307gpNu6bgrpxT6u9lGp3Q/w4JBYA9uynSz5 ... ";
String decodedContent = IOUtils.toString(Base64.decodeBase64(base64Content.getBytes()), "UTF-8");

If the decodedContent is not readable, you may have a binary file (eg MS Word,image etc). Usually looking at the binary file you can tell what it is. If not look at using Apache Tika

When writing the data back out just ensure you use UTF-8 again. See how-to-write-a-utf-8-file-with-java