Bài tập IXJ - FO sử dụng Apache FOP chuyển XML sang PDF

XSL-FO (XSL Formatting Objects) chuyển đổi dữ liệu XML sang các định dạng khác.

Trong bài thực hành này chúng ta sẽ sử dụng thư viện FOP của Apache tích hợp vào chương trình Java để chuyển tài liệu XML chứa CustomerOrders mua sản phẩm sang biểu mẩu PDF.

CustomerOrders



Các thư viện hỗ trợ -->> đây

Mã nguồn tham khảo như sau:
[sourcecode language="java"]
package fop_ex;
import java.io.File;
import java.io.OutputStream;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXResult;
import javax.xml.transform.stream.StreamSource;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.apps.Fop;
import org.apache.fop.apps.FopFactory;
import org.apache.fop.apps.MimeConstants;
public class FOP_EX {
public static void main(String[] args) {
try {
// Setup directories
File baseDir = new File(".");
File outDir = new File(baseDir, "src/out");
outDir.mkdirs();
// Setup input and output files
File xmlfile = new File(baseDir, "src/xml/CustomerOrders.xml");
File xsltfile = new File(baseDir, "src/xslt/Customer_fo.xsl");
File pdffile = new File(outDir, "CustomerOrders.pdf");
// configure fopFactory as desired
final FopFactory fopFactory = FopFactory.newInstance(new File(".").toURI());
// configure foUserAgent as desired
FOUserAgent foUserAgent = fopFactory.newFOUserAgent();
// Setup output
OutputStream out = new java.io.FileOutputStream(pdffile);
out = new java.io.BufferedOutputStream(out);
try {
// Construct fop with desired output format
Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, out);
// Setup XSLT
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer(new StreamSource(xsltfile));
// Set the value of a <param> in the stylesheet
transformer.setParameter("author", "Nguyen Van Mit");
// Setup input for XSLT transformation
Source src = new StreamSource(xmlfile);
// Resulting SAX events (the generated FO) must be piped through to FOP
Result res = new SAXResult(fop.getDefaultHandler());
// Start XSLT transformation and FOP processing
transformer.transform(src, res);
} finally {
out.close();
}
} catch (Exception e) {
e.printStackTrace(System.err);
System.exit(-1);
}
}
}
[/sourcecode]
File XSL-FO như sau:
[sourcecode language="xml"]
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.1" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format" exclude-result-prefixes="fo">
<xsl:output method="xml" version="1.0" omit-xml-declaration="no" indent="yes"/>
<xsl:param name="author" select="'Tran Van Cam'"/>
<xsl:template match="customers">
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
<fo:layout-master-set>
<fo:simple-page-master master-name="simpleA4" page-height="29.7cm" page-width="21cm" margin-top="2cm" margin-bottom="2cm" margin-left="2cm" margin-right="2cm">
<fo:region-body/>
</fo:simple-page-master>
</fo:layout-master-set>
<fo:page-sequence master-reference="simpleA4">
<fo:flow flow-name="xsl-region-body">
<fo:block font-size="16pt" text-align="center" font-weight="bold" space-after="5mm">CUSTOMER ORDER LIST<xsl:value-of select="customers"/>
</fo:block>
<fo:block font-size="12pt" text-align="center" space-after="5mm">----oOo----</fo:block>
<fo:block font-size="10pt">
<fo:table table-layout="fixed" width="100%"
border-collapse="separate" border="solid"
border-separation="3pt">
<xsl:attribute-set name="table.cell.padding">
<xsl:attribute name="padding-left">2pt</xsl:attribute>
<xsl:attribute name="padding-right">2pt</xsl:attribute>
<xsl:attribute name="padding-top">2pt</xsl:attribute>
<xsl:attribute name="padding-bottom">2pt</xsl:attribute>
</xsl:attribute-set>
<fo:table-column column-width="2cm"/>
<fo:table-column column-width="5cm"/>
<fo:table-column column-width="5cm"/>
<fo:table-column column-width="2cm"/>
<fo:table-column column-width="3cm"/>
<fo:table-header>
<fo:table-row background-color="#0000FF" color="#FFFFFF">
<fo:table-cell text-align="center">
<fo:block>Order.</fo:block>
</fo:table-cell>
<fo:table-cell>
<fo:block>Customer name</fo:block>
</fo:table-cell>
<fo:table-cell>
<fo:block>Product name</fo:block>
</fo:table-cell>
<fo:table-cell text-align="right">
<fo:block>Quantity</fo:block>
</fo:table-cell>
<fo:table-cell text-align="right">
<fo:block>Price</fo:block>
</fo:table-cell>
</fo:table-row>
</fo:table-header>
<fo:table-body>
<xsl:apply-templates select="customer"/>
</fo:table-body>
</fo:table>
</fo:block>
<fo:block font-size="12pt" text-align="right" space-before="1cm">Signature</fo:block>
<fo:block font-size="12pt" text-align="right" space-before="2cm" space-after="5mm"> <xsl:value-of select="$author"/> </fo:block>
</fo:flow>
</fo:page-sequence>
</fo:root>
</xsl:template>
<xsl:template match="customer">
<xsl:variable name="bgclr">
<xsl:choose>
<xsl:when test="position() mod 2">#A7BFDE</xsl:when>
<xsl:otherwise>#EDF2F8</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<fo:table-row background-color="{$bgclr}">
<xsl:if test="item='Laptop'">
<xsl:attribute name="font-weight">bold</xsl:attribute>
</xsl:if>
<fo:table-cell text-align="center">
<fo:block>
<xsl:value-of select="position()" format="1."/>
</fo:block>
</fo:table-cell>
<fo:table-cell>
<fo:block>
<xsl:value-of select="name"/>
</fo:block>
</fo:table-cell>
<fo:table-cell>
<fo:block>
<xsl:value-of select="item"/>
</fo:block>
</fo:table-cell>
<fo:table-cell text-align="right">
<fo:block>
<xsl:value-of select="quantity"/>
</fo:block>
</fo:table-cell>
<fo:table-cell text-align="right">
<xsl:attribute name="font-weight">bold</xsl:attribute>
<fo:block>
<xsl:value-of select="price"/>
</fo:block>
</fo:table-cell>
</fo:table-row>
</xsl:template>
</xsl:stylesheet>
[/sourcecode]
Căn bản là vậy !!!