Create OutputFile in jsp and write this file to response

Don't forget to set the contentLength. Some clients/applications will refuse to run/open the file otherwise.

At the bottom of this article you can find several reuseable downloadFile() utility methods: http://balusc.xs4all.nl/srv/dev-jep-pdf.html

I'll copypaste them here:

package net.balusc.util;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.ByteArrayInputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.net.URLConnection;

import javax.servlet.http.HttpServletResponse;

public class HttpServletUtil {

/**

* Send the given file as a byte array to the servlet response. If attachment

* is set to true, then show a "Save as" dialogue, else show the file inline

* in the browser or let the operating system open it in the right application.

* @param response The HttpServletResponse to be used.

* @param bytes The file contents in a byte array.

* @param fileName The file name.

* @param attachment Download as attachment?

*/

public static void downloadFile(HttpServletResponse response, byte[] bytes, String fileName, boolean attachment) throws IOException {

// Wrap the byte array in a ByteArrayInputStream and pass it through another method.

downloadFile(response, new ByteArrayInputStream(bytes), fileName, attachment);

}

/**

* Send the given file as a File object to the servlet response. If attachment

* is set to true, then show a "Save as" dialogue, else show the file inline

* in the browser or let the operating system open it in the right application.

* @param response The HttpServletResponse to be used.

* @param file The file as a File object.

* @param attachment Download as attachment?

*/

public static void downloadFile(HttpServletResponse response, File file, boolean attachment) throws IOException {

// Prepare stream.

BufferedInputStream input = null;

try {

// Wrap the file in a BufferedInputStream and pass it through another method.

input = new BufferedInputStream(new FileInputStream(file));

downloadFile(response, input, file.getName(), attachment);

} catch (IOException e) {

throw e;

} finally {

// Gently close stream.

if (input != null) {

try {

input.close();

} catch (IOException e) {

e.printStackTrace();

// This is a serious error. Do more than just printing a trace.

}

}

}

}

/**

* Send the given file as an InputStream to the servlet response. If attachment

* is set to true, then show a "Save as" dialogue, else show the file inline

* in the browser or let the operating system open it in the right application.

* @param response The HttpServletResponse to be used.

* @param input The file contents in an InputStream.

* @param fileName The file name.

* @param attachment Download as attachment?

*/

public static void downloadFile(HttpServletResponse response, InputStream input, String fileName, boolean attachment) throws IOException {

// Prepare stream.

BufferedOutputStream output = null;

try {

// Prepare.

int contentLength = input.available();

String contentType = URLConnection.guessContentTypeFromName(fileName);

String disposition = attachment ? "attachment" : "inline";

// Init servlet response.

response.setContentLength(contentLength);

response.setContentType(contentType);

response.setHeader("Content-disposition", disposition + "; filename=\"" + fileName + "\"");

output = new BufferedOutputStream(response.getOutputStream());

// Write file contents to response.

while (contentLength-- > 0) {

output.write(input.read());

}

// Finalize task.

output.flush();

} catch (IOException e) {

throw e;

} finally {

// Gently close stream.

if (output != null) {

try {

output.close();

} catch (IOException e) {

e.printStackTrace();

// This is a serious error. Do more than just printing a trace.

}

}

}

}

}

BalusCa at 2007-7-28 17:49:46 >