[#WW-602] Stream Result Type - OpenSymphony JIRA

WebWork

Stream Result Type

Created: 27/Jul/04 01:54 PM Updated: 16/Aug/05 05:54 PM

Component/s:

Views

Affects Version/s:

2.1

Fix Version/s:

2.1.2

File Attachments:

StreamResult.java (3 kB)

Description

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I wrote this Stream Result handler to take an an InputStream from the invocation value stack and redirect it to the browser. It takes a configurable content-type. Should perhaps include some handling for cache control headers. Thought I should give you guys a copy to do what you please.

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Martin Crawford added a comment - 27/Jul/04 01:54 PM

Here is the file.

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Patrick Lightbody added a comment - 09/Sep/04 07:00 PM

thanks

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Martin Crawford added a comment - 16/Sep/04 11:26 AM

Realized that probably the input stream should be closed after the data is transfered to the output stream. Not sure what memory leak issues might occur otherwise. So far I haven't encountered any in my application using this but it would seem to be good practice.

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David Bernard added a comment - 29/Oct/04 10:39 AM

with webwork 2.1.5, I need to add the parameter "parse" to avoid NPE in xwork TextParseUtil.

      <result name="success" type="stream">
        <param name="parse">false</param>
        <param name="contentType">image/png</param>
        <param name="inputName">imageStream</param>
        <param name="bufferSize">1024</param>
      </result>

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Paul Zepernick added a comment - 16/Aug/05 05:54 PM

On 2.1.7 I had a problem with the stream not being closed. I need to delete files that had been read by the stream later on, and had issues because they were in use. I implemented the following fix in the class:

    protected void doExecute(String finalLocation, ActionInvocation invocation)
            throws Exception {

        InputStream oInput = null;
        OutputStream oOutput = null;

        try{
// Find the inputstream from the invocation variable stack
oInput = (InputStream) invocation.getStack().findValue(conditionalParse(inputName, invocation));

// Find the Response in context
HttpServletResponse oResponse = (HttpServletResponse) invocation.getInvocationContext().get(HTTP_RESPONSE);

// Set the content type
oResponse.setContentType(conditionalParse(contentType, invocation));

// Set the content-disposition
if (contentDisposition != null) {
oResponse.addHeader("Content-disposition", conditionalParse(contentDisposition, invocation));
}

// Get the outputstream
oOutput = oResponse.getOutputStream();

// Copy input to output
byte[] oBuff = new byte[bufferSize];
int iSize = 0;
while (-1 != (iSize = oInput.read(oBuff))) {
oOutput.write(oBuff, 0, iSize);
}

// Flush
oOutput.flush();
        }finally{
            if (oInput != null)oInput.close();
            if (oOutput != null)oOutput.close();
        }


    }