jsp jug: Simple file upload in jsp

<HTML>
<HEAD>
<TITLE>Display file upload form to the user</TITLE>
</HEAD>
<BODY>
<FORM ENCTYPE="multipart/form-data" ACTION="upload.jsp" METHOD=POST>
<br>
<br>
<br>
<center>
<table border="0" bgcolor=#ccFDDEE>
<tr>
<center>
<td colspan="2" align="center"><B>UPLOAD THE FILE</B>
<center>
</td>
</tr>
<tr>
<td colspan="2" align="center"></td>
</tr>
<tr>
<td><b>Choose the file To Upload:</b></td>
<td><INPUT NAME="file" TYPE="file"></td>
</tr>
<tr>
<td colspan="2" align="center"></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit"
value="Send File"></td>
</tr>
<table>
</center>
</FORM>
</BODY>
</HTML>

<%@ page import="java.io.*"%>

String saveFile = "";

String contentType = request.getContentType();

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);

saveFile = file.substring(file.indexOf("filename=\"") + 10);

saveFile = saveFile.substring(0, saveFile.indexOf("\n"));

saveFile = saveFile.substring(saveFile.lastIndexOf("\\") + 1, saveFile.indexOf("\""));

int lastIndex = contentType.lastIndexOf("=");

String boundary = contentType.substring(lastIndex + 1, contentType.length());

int pos;

pos = file.indexOf("filename=\"");

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;

saveFile = "/var/lib/tomcat/webapps/manual_pull/file_uploads/" + saveFile;

try{

File ff = new File(saveFile);

FileOutputStream fileOut = new FileOutputStream(ff);

fileOut.write(dataBytes, startPos, (endPos - startPos));

fileOut.flush();

fileOut.close();

}catch(Exception e){

out.println(e.getMessage());

}

%><Br>

<tr>

<td><b>You have successfully upload the file by the name of:</b>

out.println(saveFile);

}

</td>

</tr>

</table>

jsp jug

Tuesday, 21 March 2017

Simple file upload in jsp

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