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Title :
Struts2

Description :
Tags such as IF Iterator Tags
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Title :
Struts Eclipse MVC

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Title :
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Description :
Code with Sample Action
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Title :
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open for discussion
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with Code and article
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Tags/Keywords : Struts, Struts2 Tutorial, Struts 2 Example, Struts2
Author : ISHTEK
Date (Year/Month/Date): 2009-09-13
Struts 2.1.6 - Result Type Stream example code

Please be informed that NONE of the design/code from this
page is claiming to be some sort of best practices and we DO NOT expect
any of our visitor/reader of this page to assume this as some sort of
best practice for any context and should not be using this 
as it is without appropriate evaluation to their, so to say, 
specific programming context.

This page intends only to provide bit and piece of known ways  for
doing some sort of example and may not be fit for any other purpose.


Struts Framework and Stream Result type configuration for the 
Action to send binary stream to the browser as PDF content type

In this example I shall be showing step by step ways to follow
through various pieces of code to process or achieve an objective
of presenting binary content type to browser based client and 
this is presented to the client with the same name as mentioned
in struts.xml configuration file.



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struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
  <package name="stream-example" namespace="/sample-stream"
                 extends="struts-default">
    <action name="test" class="sample.ExampleStreamAction" 
	                       method="preview">
       <result name="test-stream" type="stream">
         <param name="inputName">fileStream</param>
	 <param name="contentType">application/pdf</param>
         <param name="contentDisposition">filename="test.pdf"</param>
       </result>
    </action>
  </package>
</struts>



Action class "ExampleStreamAction.java" is having a preview method 
that assigns an input stream to a private instance variable, this
variable is mentioned as the inputName param value to the result
tag.

In this xample, the inputName param is having value as fileStream
, that is defined as an instance variable in Action class.

ExampleStreamAction

package sample;

import java.io.*;
public class ExampleStreamAction
{
    private InputStream fileStream;
	public void setFileStream(InputStream arg) {
		fileStream = arg;
	}
	public InputStream getFileStream() {
		return fileStream;
	}
	public String preview() throws Exception {
		try{
			fileStream = new DataInputStream(
			  new FileInputStream("c:/sources/test.pdf"));
		} catch (IOException ioEx) {
			ioEx.printStackTrace();
		}
		return "test-stream";
	}
}



web.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, 
    Inc.//DTD Web Application 2.3//EN"
    "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>
    <display-name>Struts 2 Stream Result type</display-name>
  <filter>
  <filter-name>sample-filter</filter-name>
  <filter-class> 
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
  </filter-class>
  </filter>
  <filter-mapping>
    <filter-name>sample-filter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>



After deploying this example to Jakarta Tomcat web server
and tested this example with a URL as
http://localhost:8080/struts2sample/sample-stream/test

This example application reads the PDF file from the path
mentioned in the Action class and preview method.
This result type definition in struts.xml file sends those to the client
as downloadable file name.

Please write your comments about this example in this form.



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As a developer and working on application/projects using 
Struts Framework for more than 5 years, I am exploring features
such as various result types available to us for doing certain
things like rendering various output types, with ease.

Author of this article/writeup has expressed his/her willingness
to help or guide users with any technical difficulties he/she faces
while working with the example code environment setting up, running
and resolving any such exception raised during compile or at runtime.
You may ask for any technical doubt or seek technical help related to
this article by using following form to reach for technical help
from the Author for FREE.

This article's Author shall be reading your request and responding
within reasonable time (no resolution timeframe defined as such).

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