使用 XStream 和 XSL-FO 生成 PDF

				
class@XStreamAlias("PurchaseOrder")
public class PurchaseOrder implements IPurchaseOrder, IXmlSerializable {
    // private instance variables
    /** The m_orderId. */
    @XStreamAlias("OrderId")
    @XStreamAsAttribute
    private String m_orderId = null;

    /** The m_order date. */
    @XStreamAlias("OrderDate")
    private Date m_orderDate = null;

    /** The m_company addr. */
    @XStreamAlias("CompanyAddress")
    private IAddress m_companyAddr = null;

    /** The m_customerAdress addr. */
    @XStreamAlias("CustomerAddress")
    private IAddress m_customerAdress = null;

    /** The m_items. */
    @XStreamAlias("Items")
    private ArrayList<IOrderItem> m_items = null;

    ...

    // IXmlSerializable method
    public String toXml() {
        XStream xstream = new XStream();
        xstream.autodetectAnnotations(true);
        return xstream.toXML(this);
    }
}

							
<PurchaseOrder OrderId="PO-123-456789">
    <OrderDate>2009-06-14 13:05:02.251 EDT</OrderDate>
    <CompanyAddress>
        <CompanyName>ACME Company</CompanyName>
        <StreetAddress>123 Main Street</StreetAddress>
        <City>Orlando</City>
        <State>FL</State>
        <ZipCode>32801</ZipCode>
    </CompanyAddress>
    <CustomerAddress>
        <CompanyName>A++</CompanyName>
        <StreetAddress>123 8th Avenue</StreetAddress>
        <City>Orlando</City>
        <State>FL</State>
        <ZipCode>32801</ZipCode>
    </CustomerAddress>
    <Items>
        <Item ItemId="A1B2C3" ItemName="Widget" Quantity="100" ItemCost="100.5"/>
        <Item ItemId="C3B2A1" ItemName="Micro-Widget" Quantity="1000" ItemCost="10.75"/>
    </Items>
</PurchaseOrder>			

								
<fo:layout-master-set>
    <fo:simple-page-master 
        margin-right="1in" 
        margin-left="1in" 
        margin-bottom="0.5in" 
        margin-top="1in" 
        page-width="8.5in" 
        page-height="11in" 
        master-name="standardletter">

        <fo:region-body 
            margin-bottom="1in" 
            margin-top="1in"/>		
        <fo:region-after extent="0.5in"/>
    </fo:simple-page-master>
</fo:layout-master-set>

							
<xsl:template match="PurchaseOrder">
    <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
        <!-- Create page layout - including margins -->
        <fo:layout-master-set>			
            <!-- Page size and margins -->
            <fo:simple-page-master 
                master-name="all"
                page-height="11in"
                page-width="8.5in" 
                margin-top="0.25in"
                margin-bottom="0.25in"
                margin-left="1in" 
                margin-right="1in">
            <!-- Main content layout -->
            <fo:region-body margin-top="2in" 
                margin-bottom="1in" />
            <!-- Header layout -->
            <fo:region-before extent="2in" />
            <!-- Footer layout -->
            <fo:region-after extent="1in" />
            </fo:simple-page-master>
        </fo:layout-master-set>

        <!-- Create page sequence-->
        <fo:page-sequence master-reference="all">
            <!-- Create header -->
            <fo:static-content flow-name="xsl-region-before">
                <!-- Output company address information in header -->
                <xsl:apply-templates 
                    select="CompanyAddress" />
                <fo:block font-size="18pt" 
                    font-family="sans-serif"
                    line-height="1.5em" 
                    background-color="black" 
                    color="white"
                    text-align="center"
                    >PURCHASE ORDER</fo:block>
            </fo:static-content>
            <!-- Create footer -->
            <fo:static-content flow-name="xsl-region-after">
                <!-- Add page number to footer -->
                <fo:block text-align="end" 
                font-size="10pt" 
                font-family="serif">
                    Page <fo:page-number />
                </fo:block>
            </fo:static-content>

            <!-- Create main document content -->
            <fo:flow flow-name="xsl-region-body">
                <!-- Display order information (date, id)-->
                <xsl:call-template name=
                "DisplayOrderInformation" />

                <!-- Display Customer Address information -->
                <xsl:apply-templates select=
                "CustomerAddress" />

                <!-- Display items-->
                <xsl:apply-templates select="Items" />
            </fo:flow>
        </fo:page-sequence>
    </fo:root>
</xsl:template>			

							
<xsl:template match="CompanyAddress">
<fo:table width="100%">
    <fo:table-column column-width="40%" />
    <fo:table-column column-width="60%" />
    <fo:table-body>
        <fo:table-row>
            <fo:table-cell>
            <fo:block>
            <fo:external-graphic
            src="url(D:\workspace\DwArticle5\resources\CompanyLogo.jpg)" />
            </fo:block>
            </fo:table-cell>
            <fo:table-cell>
            <fo:block>
            <fo:block text-align="right">
            <xsl:value-of select="./StreetAddress" />
            </fo:block>
            <fo:block text-align="right">
            <xsl:value-of select="concat(./City, ' ', 
                ./State, ' ', 
                ./ZipCode)" />
            </fo:block>
            </fo:block>
            </fo:table-cell>
        </fo:table-row>
    </fo:table-body>
</fo:table>
</xsl:template>

<xsl:call-template name="DisplayOrderInformation" />

				
<xsl:template name="DisplayOrderInformation">
    <fo:block text-align="right">
        <fo:inline font-weight="bold">Id:</fo:inline>
        <xsl:value-of select="./@OrderId" />
    </fo:block>
    <fo:block text-align="right">
        <fo:inline font-weight="bold">Order Date:</fo:inline>
        <xsl:value-of select="./OrderDate" />
    </fo:block>
</xsl:template>

					
<!-- Template for Items element-->	
<!-- Outputs a TABLE -->	
<xsl:template match="Items">
    <fo:block font-weight="bold" background-color="black" color="white"
    padding="2pt">ITEMS</fo:block>

    <fo:table width="100%">
    <!-- Add table column widths -->
    <fo:table-column column-width="10%" />
    <fo:table-column column-width="15%" />
    <fo:table-column column-width="30%" />
    <fo:table-column column-width="15%" />
    <fo:table-column column-width="15%" />
    <fo:table-column column-width="15%" />
    <!-- Add table header row -->	
    <fo:table-header>
    <fo:table-row>
    <fo:table-cell border="solid black 1px">
    <fo:block font-weight="bold"
    >#</fo:block>
    </fo:table-cell>
    <fo:table-cell border="solid black 1px">
    <fo:block font-weight="bold"
    >Item ID</fo:block>
    </fo:table-cell>
    <fo:table-cell border="solid black 1px">
    <fo:block font-weight="bold"
    >Description</fo:block>
    </fo:table-cell>
    <fo:table-cell border="solid black 1px">
    <fo:block font-weight="bold"
    >Quantity</fo:block>
    </fo:table-cell>
    <fo:table-cell border="solid black 1px">
    <fo:block font-weight="bold"
    >Item Cost</fo:block>
    </fo:table-cell>
    <fo:table-cell border="solid black 1px">
    <fo:block font-weight="bold"
    >Total Cost</fo:block>
    </fo:table-cell>
    </fo:table-row>
    </fo:table-header>
    <fo:table-body>
    <xsl:apply-templates />
    <!-- Add row for summary. Span all columns and apply bold to total-->		
    <fo:table-row>
    <fo:table-cell border="solid black 1px"
    number-columns-spanned="5">
    <fo:block font-weight="bold" 
    text-align="right">Total
    </fo:block>
    </fo:table-cell>
    <fo:table-cell border="solid black 1px">
    <fo:block font-weight="bold">
    <!-- Return the number into a variable which is displayed below -->
        <xsl:variable name="total">
    <!-- The following line needs to be uncommented if the mode 
    and recursion approach is utilized. -->
    <!--							     
    <xsl:apply-templates select="Item[1]"
            mode="calculateTotal" />-->
    <!-- The following call-template needs to be commented out if the call-template 
    approach is not utilized. -->
            <xsl:call-template name="calculateTotal">
                <xsl:with-param name="nodes" select="Item" />
            </xsl:call-template> 
        </xsl:variable>
    <!-- Output value of "total" variable -->					
        <xsl:value-of select="format-number($total, '$#,##0.00')"/>
    </fo:block>
    </fo:table-cell>
    </fo:table-row>
    </fo:table-body>
    </fo:table>
</xsl:template>

<!-- Template for Item element-->	
<!-- Outputs a TR for each Item -->	
<xsl:template match="Item">
<fo:table-row>
    <fo:table-cell border="solid black 1px">
    <fo:block>
    <xsl:number/>
    </fo:block>
    </fo:table-cell>
    <fo:table-cell border="solid black 1px">
    <fo:block>
    <xsl:value-of select="@ItemId" />
    </fo:block>
    </fo:table-cell>
    <fo:table-cell border="solid black 1px">
    <fo:block>
    <xsl:value-of select="@ItemName" />
    </fo:block>
    </fo:table-cell>
    <fo:table-cell border="solid black 1px">
    <fo:block>
    <xsl:value-of select="@Quantity" />
    </fo:block>
    </fo:table-cell>
    <fo:table-cell border="solid black 1px">
    <fo:block>
    <xsl:value-of select="format-number(@ItemCost, '$#,##0.00')" />
    </fo:block>
    </fo:table-cell>
    <fo:table-cell border="solid black 1px">
    <xsl:variable name="total" select="@Quantity * @ItemCost" />
    <fo:block>
    <xsl:value-of select="format-number($total, '$#,##0.00')" />
    </fo:block>
    </fo:table-cell>
    </fo:table-row>
</xsl:template>

					
<xsl:template name="calculateTotal">
<xsl:param name="nodes" select="/.." />
<xsl:param name="subtotal" select="0" />
<xsl:variable name="total"
 select="$subtotal + ($nodes[1]/@ItemCost * $nodes[1]/@Quantity)" />
<xsl:choose>
    <!-- check if more Item nodes to process and stop and return value if not -->
    <xsl:when test="not($nodes[2])">
        <xsl:value-of select="$total" />
    </xsl:when>
    <!-- recursively call template since there are more Item nodes to process -->
    <xsl:otherwise>
        <xsl:call-template name="calculateTotal">
            <xsl:with-param name="nodes"
            select="$nodes[position() > 1]" />
            <xsl:with-param name="subtotal" select="$total" />
        </xsl:call-template>
    </xsl:otherwise>
</xsl:choose>
</xsl:template>

					
<xsl:template match="Item" mode="calculateTotal">
<xsl:param name="subtotal" select="0" />
<xsl:variable name="total"
 select="$subtotal + (@ItemCost * @Quantity)" />
<xsl:choose>
<!-- check if more Item nodes to process and stop and return value if not -->
    <xsl:when test="not(following-sibling::Item)">
        <xsl:value-of select="$total" />
    </xsl:when>
    <xsl:otherwise>
<!-- recursively apply template since there are more Item nodes to process -->	
        <xsl:apply-templates select="following-sibling::Item[1]"
            mode="calculateTotal">
            <xsl:with-param name="subtotal" select="$total" />
        </xsl:apply-templates>
    </xsl:otherwise>
</xsl:choose>
</xsl:template>

				
public class PdfGenerator implements IPdfGenerator {

    public OutputStream generate(IXmlSerializable object, String stylesheetPath, 
                    OutputStream pdfContent) {    
        try {
            // setup xml input source
            String xml = object.toXml();
            StreamSource xmlSource = 
                        new StreamSource(new ByteArrayInputStream(xml.getBytes()));
      
            // setup xsl stylesheet source
            File xslFile = new File(stylesheetPath);
            FileInputStream xslFileStream = new FileInputStream(xslFile);
            StreamSource xslSource = new StreamSource(xslFileStream);

            // get transformer
            TransformerFactory tfactory = TransformerFactory.newInstance();
            Transformer transformer = tfactory.newTransformer(xslSource);

            // setup FOP
            FopFactory fopFactory = FopFactory.newInstance();
            FOUserAgent foUserAgent = fopFactory.newFOUserAgent();
            foUserAgent.setProducer(this.getClass().getName());
            Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent,
                                    pdfContent);
                  
            // perform transformation 
            Result res = new SAXResult(fop.getDefaultHandler());
            transformer.transform(xmlSource, res);
        } catch (FileNotFoundException e) { e.printStackTrace(); 
        } catch (TransformerException e) {  e.printStackTrace();
        } catch (FOPException e) { e.printStackTrace();
        }
            
        return pdfContent;
    }
}