Problem in copy the file from WAR

Question

I have the following requirement.
I have one file in WAR file which is to be copied to sme location in server during Server start after deployment.
I am using one servlet, which is being loaded during startup. I have written the code in "init" method of servlet.
try {
String fontFolderString = config.getServletContext().getInitParameter("WORKING_FOLDER")+ "\\fontFolder";
BufferedInputStream bis = (BufferedInputStream)this.getClass().getClassLoader().getResourceAsStream("\\image\\a.jpg");
File in = new File("");
File out = new File(fontFolderString);
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(in));
BufferedOutputStream bos = new BufferedOutputStream(
new FileOutputStream(out));
byte inArr[] = new byte[bis.available()];
int size = bis.read(inArr, 0, inArr.length);
bos.write(inArr, 0, size);
bis.close();
bos.close();
} catch (Exception e) {
     e.printStackTrace();
}image folder as mention in the line "BufferedInputStream bis" is in the directlry where servlet is there.
Here "bis" is being returned as null.
Please provide me the pointers what is wrong above
~Aman

Answer 1

The line of code
getClass().getClassLoader().getResourceAsStream("\\image\\a.jpg");searches the file a.jpg inside a dicrectory image located in the classpath of the web application. For example in web-inf/classes... The position of the servlet is insignificant.
If you are looking for the file in the web context (for example in the image folder of your web application you should use:
config.getServletContext().getResourceAsStream("\\image\\a.jpg");