JSP/File Upload

~java
<!-- upload.jsp -->
<%@ page import="java.io.*" %>

<%
	String contentType = request.getContentType();
	System.out.println("Content type is :: " +contentType);
	if ((contentType != null) && (contentType.indexOf("multipart/form-data") >= 0)) 
	{
		DataInputStream in = new DataInputStream(request.getInputStream());
		int formDataLength = request.getContentLength();
		
		byte dataBytes[] = new byte[formDataLength];
		int byteRead = 0;
		int totalBytesRead = 0;
		while (totalBytesRead < formDataLength) {
		byteRead = in.read(dataBytes, totalBytesRead, formDataLength);
		totalBytesRead += byteRead;
	}
	
	String file = new String(dataBytes);
	String saveFile = file.substring(file.indexOf("filename="") + 10);
	saveFile = saveFile.substring(0, saveFile.indexOf("\n"));
	saveFile = saveFile.substring(saveFile.lastIndexOf("\") + 1,saveFile.indexOf("""));
	
	//out.print(dataBytes);
	
	int lastIndex = contentType.lastIndexOf("=");
	String boundary = contentType.substring(lastIndex + 1,contentType.length());
	//out.println(boundary);
	int pos;
	pos = file.indexOf("filename="");
	
	pos = file.indexOf("\n", pos) + 1;
	
	pos = file.indexOf("\n", pos) + 1;
	
	pos = file.indexOf("\n", pos) + 1;
	
	
	int boundaryLocation = file.indexOf(boundary, pos) - 4;
	int startPos = ((file.substring(0, pos)).getBytes()).length;
	int endPos = ((file.substring(0, boundaryLocation)).getBytes()).length;
	
	FileOutputStream fileOut = new FileOutputStream(saveFile);
	
	
	//fileOut.write(dataBytes);
	fileOut.write(dataBytes, startPos, (endPos - startPos));
	fileOut.flush();
	fileOut.close();
//	out.println("File saved as " +saveFile);
	out.write("<meta http-equiv="refresh" content="0;url=BugReport.jsp?fileName="+saveFile+"">");			
	}
%>