Uploading a file to a server using JSP

By: Ramesh Kumar Swarnkar


<!--
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);



}

%>