利用JDOM把JPG图象数据写入XML一个简单例子

public static byte[] getBytesFromFile(File file) throws IOException
{
InputStream is = new FileInputStream(file);
long length = file.length();
if (length > Integer.MAX_VALUE)
{
return null;
}

byte[] bytes = new byte[ (int) length];

int offset = 0;
int numRead = 0;
while (offset < bytes.length
&& (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0)
{
offset += numRead;
}

if (offset < bytes.length)
{
throw new IOException("Could not completely read file " + file.getName());
}

is.close();
return bytes;
}

public String getBinaryFile(java.io.File file)
{
String result = "";
try
{
result = new BASE64Encoder().encode(this.getBytesFromFile(file));
}
catch (Exception exp)
{
JOptionPane.showMessageDialog(this, exp);
return null;
}
return result;
}

try
{
InputStream is = new FileInputStream(jpgFile);
OutputStream out = new FileOutputStream("E:\\bb.xml");
BufferedInputStream bis = new BufferedInputStream(is);
Element rootElement = new Element("root");
Document myDocument = new Document(rootElement);
rootElement.addContent(new CDATA(this.getBinaryFile(jpgFile)));

XMLOutputter outputter = new XMLOutputter("  ", true);
outputter.output(myDocument, out);
bis.close();
is.close();
out.close();
}
catch (Exception ee)
{
JOptionPane.showMessageDialog(this, "file can't be writed");
return;
}

}

CDATA cdata  ;
try
{
SAXBuilder builder = new SAXBuilder();
Document ad = builder.build(xmlFile);
Element rootElement = ad.getRootElement();
java.util.List list = rootElement.getMixedContent();

java.util.Iterator itr = list.iterator();
FileOutputStream fout = new FileOutputStream("E:\\1.jpg");

while(itr.hasNext())
{
Object o = itr.next();
if (o instanceof CDATA)
{
cdata = (CDATA)o;
fout.write(new sun.misc.BASE64Decoder().decodeBuffer(cdata.getText()));
fout.close();
break;
}

}

}
catch (Exception eep)
{
JOptionPane.showMessageDialog(this, "read xml error");
return;
}