Code 3 - Dump File - UploadDump.jspx

JSP Tutorials - Herong's Tutorial Examples - Version 4.03, by Dr. Herong Yang

JSP Tutorials - Herong's Tutorial Examples

∟Code 3 - Dump File - UploadDump.jspx

This section provides a tutorial example of a JSP page, UploadDump.jspx, that reads the uploaded file and dumps it back to the browser. The key logic is the request.getInputStream() call.

As Part 3 of the file upload test, here is my UploadDump.jspx page, that reads the uploaded file and dumps it back to the browser.

<?xml version="1.0"?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1">
<!-- UploadDump.jspx
 - Copyright (c) 2012, HerongYang.com, All Rights Reserved.
-->
<jsp:directive.page contentType="text/html"/>
<html><body>
<p>
<jsp:scriptlet><![CDATA[
   out.println("<pre>");
   ServletInputStream in = request.getInputStream();
   byte[] line = new byte[128];
   int i = in.readLine(line, 0, 128);
   while (i != -1) {
      out.print(new String(line, 0, i));
      i = in.readLine(line, 0, 128);
   }
   out.println("</pre>");
]]></jsp:scriptlet>
</p>
</body></html>
</jsp:root>

As you can see, this JSP page is very simple. The key is the request.getInputStream() call, which returns a ServletInputStreem object connecting to the HTTP request body. Reading the data from the stream object and dump it back to the browser is easy.

Last update: 2012.

Table of Contents

About This Book

JSP (JavaServer Pages) Overview

Tomcat 7 Installation on Windows Systems

JSP Scripting Elements

Java Servlet Introduction

JSP Implicit Objects

Syntax of JSP Pages and JSP Documents

JSP Application Session

Managing Cookies in JSP Pages

JavaBean Objects and "useBean" Action Elements