java - FopFactory.newInstance() 时出现 Fop 异常

Question

我正在使用 struts 2，我正尝试使用 fop 从 xml 和 xsl 创建一个 pdf 文件。我在这两个 url http://svn.apache.org/viewvc/xmlgraphics/fop/trunk/examples/embedding/java/embedding/ExampleXML2PDF.java?view=markup 基础上开发我的代码和 http://justcode.wordpress.com/2009/01/16/generare-pdf-con-struts2-fop-xml-e-xslt/

这是我的代码，我正在尝试使用两种不同的方式

public class JspToPdfTest extends ActionSupport{

private InputStream inputStream;
private Xml2PdfManager xml2PdfManager;

public InputStream getInputStream() {
    return inputStream;
}
public void setInputStream(InputStream inputStream) {
    this.inputStream = inputStream;
}   
public JspToPdfTest(){
    xml2PdfManager = new Xml2PdfManager();
}

public String doPrint()  {
    String xml = "C:\\Users\\Administrator\\workspace\\path\\actions\\forms\\testeFOPxml.xml";
    String xslPath = "C:\\Users\\Administrator\\workspace\\path\\actions\\forms\\xml2fo.xsl";
    InputStream xmlInput = new ByteArrayInputStream(xml.getBytes());

    ByteArrayOutputStream out = (ByteArrayOutputStream) xml2PdfManager.convertXML2PDF(xmlInput, new File(xslPath));

    inputStream = new ByteArrayInputStream(out.toByteArray());
    return SUCCESS;
}

public String xmlToPdf() {
                try {
                    System.out.println("FOP ExampleXML2PDF\n");
                    System.out.println("Preparing...");

                    File baseDir = new File("C:\\Users\\Administrator\\workspace\\path\\actions\\forms\\");
                    File outDir = new File(baseDir, "out");
                    outDir.mkdirs();

                    File xmlfile = new File(baseDir, "testeFOPxml.xml");
                    File xsltfile = new File(baseDir, "xml2fo.xsl");
                    File pdffile = new File(outDir, "ResultXML2PDF.pdf");

                    final FopFactory fopFactory = FopFactory.newInstance();

                    FOUserAgent foUserAgent = fopFactory.newFOUserAgent();

                    OutputStream out = new java.io.FileOutputStream(pdffile);
                    out = new java.io.BufferedOutputStream(out);

                    try {
                        Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, out);

                    TransformerFactory factory = TransformerFactory.newInstance();
                    Transformer transformer = factory.newTransformer(new StreamSource(xsltfile));

                        transformer.setParameter("versionParam", "2.0");

                        Source src = new StreamSource(xmlfile);

                        Result res = new SAXResult(fop.getDefaultHandler());

                        transformer.transform(src, res);
                    } finally {
                        out.close();
                    }
                } catch (Exception e) {
                e.printStackTrace(System.err);
                    System.exit(-1);
                }
            return SUCCESS;
            }
}

和 struts.xml Action

<action name="printDomAction2" class="com.somePackage.actions.JspToPdfTest"  method="xmlToPdf"> -->
        <result type="stream" name="success"> 
            <param name="contentType">application/pdf</param>
            <param name="contentDisposition">filename="dom.pdf"</param> 
            <param name="bufferSize">1024</param> 
        </result> 
        <interceptor-ref name="defaultStack"/> 
    </action>

    <action name="printDomAction" class="com.somePackage.actions.JspToPdfTest"  method="doPrint">
        <result type="stream" name="success">
            <param name="contentType">application/pdf</param>
            <param name="contentDisposition">filename="dom.pdf"</param>
            <param name="bufferSize">1024</param>
        </result>
        <interceptor-ref name="defaultStack"/>
    </action>

最后是 xml2PdfManager.convertXML2PDF 方法:

public OutputStream convertXML2PDF(InputStream xml, File xsl) {
    ByteArrayOutputStream out = new ByteArrayOutputStream();

    FopFactory fopFactory = FopFactory.newInstance();

    TransformerFactory tFactory = TransformerFactory.newInstance();

    try {
    Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, out);

    Source src = new StreamSource(xml);

    Source xsltSrc = new StreamSource(xsl);
    Transformer transformer = tFactory.newTransformer(xsltSrc);

    Result res = new SAXResult(fop.getDefaultHandler());
    transformer.transform(src, res);
    } catch (Exception e) {
        e.printStackTrace(System.err);
    }
    return out;
    }

在这两种情况下我都有:

java.lang.NoSuchMethodError:     
org.apache.xmlgraphics.util.Service.providerNames(Ljava/lang/Class;)Ljava/util/Iterator; 

当我执行 FopFactory.newInstance() 时；

任何帮助我的建议都会很棒!!

Answer 1

我的问题解决了!我有 xmlgraphics-commons-1.3 而不是 xmlgraphics-commons-1.5。这很奇怪，因为我使用了 fop bin 附带的所有库。

顺便说一句，转换并在浏览器上显示pdf文件的代码如下:

<action name="printDomAction" class="com.somePackage.actions.JspToPdfTest"  method="xmlToPdf">
        <result type="stream" name="success">
            <param name="contentType">application/pdf</param>
            <param name="contentDisposition">filename="ResultXML2PDF.pdf"</param>
            <param name="bufferSize">1024</param>
        </result>
        <interceptor-ref name="defaultStack"/>
    </action>

和方法

private InputStream inputStream;

public String xmlToPdf() {
                try {
                    System.out.println("FOP ExampleXML2PDF\n");
                    System.out.println("Preparing...");

                    // Setup directories
                    File baseDir = new File("C:\\Users\\Administrator\\workspace\\path\\actions\\forms\\");
                    File outDir = new File(baseDir, "out");
                    outDir.mkdirs();

                    // Setup input and output files
                    File xmlfile = new File(baseDir, "testeFOPxml.xml");
                    File xsltfile = new File(baseDir, "xml2fo.xsl");
                    File pdffile = new File(outDir, "ResultXML2PDF.pdf");

                    System.out.println("Input: XML (" + xmlfile + ")");
                    System.out.println("Stylesheet: " + xsltfile);
                    System.out.println("Output: PDF (" + pdffile + ")");
                    System.out.println();
                    System.out.println("Transforming...");

                    // configure fopFactory as desired
                    final FopFactory fopFactory = FopFactory.newInstance();

                    FOUserAgent foUserAgent = fopFactory.newFOUserAgent();
                    // configure foUserAgent as desired

                    ByteArrayOutputStream out = new ByteArrayOutputStream();

                    TransformerFactory tFactory = TransformerFactory.newInstance();


                    Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF,foUserAgent, out);
                    //Setup input
                    Source src = new StreamSource(xmlfile);

                    //Setup Transformer
                    Source xsltSrc = new StreamSource(xsltfile);
                    Transformer transformer = tFactory.newTransformer(xsltSrc);

                    //Make sure the XSL transformation's result is piped through to FOP
                    Result res = new SAXResult(fop.getDefaultHandler());
                    transformer.transform(src, res);

                    System.out.println("Success!");
                    ByteArrayOutputStream baos = out;
                    inputStream = new ByteArrayInputStream(baos.toByteArray());
                } catch (Exception e) {
                e.printStackTrace(System.err);
                    System.exit(-1);
                }

            return SUCCESS;
            }

感谢大家的提示和帮助!