PDF Servlet with Spring "AbstractPdfView" :

This example shows us how to open the Servlet output as
PDF file with Spring "AbstractPdfView" and "lowagie" API.

Please simply select with your mouse and copy if you want
to use this ready made sample.

import com.lowagie.text.Document;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;
import org.springframework.web.servlet.view.document.AbstractPdfView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.util.Map;

public class PDFView extends AbstractPdfView {
  private String filename;

  public String getFilename() {
    return filename;
  }

  public void setFilename(String filename) {
    this.filename = filename;
  }

  protected void buildPdfDocument(
          Map model,
          Document doc,
          PdfWriter writer,
          HttpServletRequest req,
          HttpServletResponse resp)
          throws Exception {

    PdfContentByte cb = writer.getDirectContent();
    PdfReader reader = new PdfReader(new FileInputStream(filename));
    for (int i = 1; i <= reader.getNumberOfPages(); i++) {
      doc.newPage();
      //import the page from source pdf
      PdfImportedPage page = writer.getImportedPage(reader, i);
      //add the page to the destination pdf
      cb.addTemplate(page, 0, 0);
    }
  }

  protected Document newDocument() {
    return new Document();
  }

}

Spring Config XML:

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

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">

    <bean name="*.pdf" class="salesOrder.PDFView">
    </bean>

</beans>

Web.xml Changes :

 <servlet>
        <servlet-name>pdfViewer</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

   <servlet-mapping>
        <servlet-name>pdfViewer</servlet-name>
        <url-pattern>*.pdf</url-pattern>
    </servlet-mapping>

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