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Stream Result example
Posted on: January 7, 2011 at 12:00 AM
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In this tutorial you learn how to use Stream Result in downloading file

Stream Result example

Stream Result is very important for allowing users to downloading contents. It is a custom result type for sending raw data via InputStream to the HttpServletResponse. It has the following parameters.

contentType- It is the MIME type which is sent on the browser.

inputName- It is the name of the input stream property.

contentLength - It is the Stream length in byte.

bufferSize- It is the size of the buffer to copy from input to output.

allowCaching - Its default value is true. If allowCaching set to false then it will set the Header "Pragma" and Cache-Control to "No-Catche".

contentDisposition - It is used for specifying file name.

An Example of Stream Result is given below

page.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>Chain Result Example</title>

<link href="<s:url value="/css/main.css"/>" rel="stylesheet"
type="text/css"/>

</head>
<body>
<font color="megenta" size="6" face="Comic Sans MS">Stream Result example</font><br clear="all"/><br clear="all"/>

<s:url action="download" id="copy"></s:url>

<strong><font color="green" size="5" face="arier">Click on <s:a href="%{copy}">file</s:a> to Download</font></strong>

</body>
</html>

StreamResultExample.java

package net.roseindia;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

import com.opensymphony.xwork2.ActionSupport;

public class StreamResultExample extends ActionSupport{

	private InputStream fileInputStream;
	  
	public InputStream getFileInputStream() {
	 
		return fileInputStream;
	}
public String execute() throws Exception {
		fileInputStream = new FileInputStream(new File("C:\\downloadfile.txt"));

	    return SUCCESS;
	  
	}

}

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>

<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" value="false" />

<package name="roseindia" extends="struts-default">
<action name="resultStream">
<result name="success">/jsp/page.jsp</result>
</action>

<action name="download" class="net.roseindia.StreamResultExample">
<result name="success" type="stream">
<param name="contentType">application/octet-stream</param>
<param name="inputName">fileInputStream</param>
<param name="contentDisposition">attachment;filename="testFile.txt"</param>
<param name="bufferSize">1024</param>
</result>
</action>
</package>

</struts>

Now Save a text file named downloadfile.txt in the C:\\downloadfile.txt. And then Run The Application Given Below

When you run this application it will display message as shown below:

 

Download this example code

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