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Apache Tapestry Interview Questions and Answers

Ques 6. How to alter the URL to point to the correct page?

You would need to throw a RedirectException with the new URL; this sends an HTTP redirect to the client.

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Ques 7. How should do page navigation in apache tapestry?

Usage page properties:

Page1.page

<page-specification class="Welcome.Action">

</page-specification>

Page2.page

<page-specification class="Welcome.Action">

</page-specification>

Welcome.Action.java

public void submitListener(IRequestCycle cycle)

{

if (success)

cycle.activate(getSpecification().getProperty("success"));

if (error)

cycle.activate(getSpecification().getProperty("error"));

}

So on success, it will be redirected to Home2 and on error it will be redirected to Error2 page.

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Ques 8. How do I make a link popup a new window?

Use the contrib:PopupLink component.

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Ques 9. How to get a file from client input to server end in apache tapestry?

Make a method like the following a a listener, such as from a DirectLink or whatever.

(The Document is just a class that holds the file information you want to send to the user.)

public void downloadAction(IRequestCycle cycle)

{

try

{

HttpServletResponse response =

cycle.getRequestContext().getResponse();

byte[] data = new byte[1024];

FileInputStream in = document.getFileInputstream();

response.setHeader("Content-disposition",

"inline; filename=" +

document.getFileName());

response.setContentType(document.getMimeType());

response.setContentLength(new Long(document.getSize()).intValue());

ServletOutputStream out = response.getOutputStream();

while (in.read(data) > -1)

{

out.write(data);

}

in.close();

response.flushBuffer();

}

catch (IOException e)

{

e.printStackTrace();

}

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