Dynamically Creating PDF in Struts 2 - struts2

Question

Good Evening ;
I have a problem that I am working on struts2 web application. I am dynamically creating a PDF using data base. i want to show it in a web page but I don`t know how I do it is any one can help me.
Thanks...

Answer 1

Action code:
public class PDFAction extends ActionSupport {
private InputStream inputStream;
public String getPDF(){
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
PdfWriter.getInstance(document, buffer);
document.open();
Paragraph p = new Paragraph();
p.add("INSTITUTO POLITÉCNICO NACIONAL, ESCUELA SUPERIOR DE CÓMPUTO, DIEGO A. RAMOS");
document.add(p);
document.close();
inputStream = new ByteArrayInputStream(buffer.toByteArray());
return SUCCESS;
}
public InputStream getInputStream() {
return inputStream;
}
public void setInputStream(InputStream inputStream) {
this.inputStream = inputStream;
}
}
Struts.xml:
<action name="getPDF" class="action.PDFAction" method="getPDF">
<result name="success" type="stream">
<param name="inputName">inputStream</param>
<param name="contentType">application/pdf</param>
<param name="contentDisposition">filename="mypdf.pdf"</param>
<param name="bufferSize">2048</param>
</result>
</action>
Try it, it works like a charm, works perfect for me. If you are in doubt read more about stream result type that Struts 2 provides. The answer to this is so simple yet it was hard to get to it.

Answer 2

You can write the content using the input stream or best way is to create custom result type where you can set appropriate header and other things here is a link for some help
Struts2 Custom Result Type

Answer 3

ByteArrayOutputStream buffer = new ByteArrayOutputStream();
PdfWriter.getInstance(document, buffer);
document.open();
////Do your stuff here
document.close();
DataOutput dataOutput = new DataOutputStream(response.getOutputStream());
byte[] bytes = buffer.toByteArray();
response.setContentLength(bytes.length);
for(int i = 0; i < bytes.length; i++)
{
dataOutput.writeByte(bytes[i]);
}
I m using iText for creating pdf. You can put this scriptlet in a jsp and call this jsp to show the pdf generated