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        FopFactory.newInstance() 时出现 Fop 异常

        时间:2023-10-14

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                  本文介绍了FopFactory.newInstance() 时出现 Fop 异常的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  我正在使用 struts 2,我正在尝试使用 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 和 http://justcode.wordpress.com/2009/01/16/generare-pdf-con-struts2-fop-xml-e-xslt/

                  i'm using struts 2 and i'm trying to use fop to create a pdf file from xml and xsl. I develop my code in base this two url http://svn.apache.org/viewvc/xmlgraphics/fop/trunk/examples/embedding/java/embedding/ExampleXML2PDF.java?view=markup and 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

                  here's my code, i'm trying using two different ways

                  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
                  ");
                                      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 动作

                  and the 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:

                  finnaly the xml2PdfManager.convertXML2PDF method:

                  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:

                  in both situations i've got:

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

                  当我执行 FopFactory.newInstance();

                  when i do the FopFactory.newInstance();

                  任何可以帮助我的建议都会很棒!

                  Any sugestion to help me woud be great!!

                  推荐答案

                  我解决了我的问题!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.

                  I solved my problem! I had the xmlgraphics-commons-1.3 instead of the xmlgraphics-commons-1.5. It's strange because i used all the libraries that came with the fop bin.

                  顺便说一下,转换并在浏览器上显示pdf文件的代码如下:

                  By the way the code that convert and show on the browser the pdf file is the follow:

                  <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>
                  

                  方法

                  private InputStream inputStream;
                  
                  public String xmlToPdf() {
                                  try {
                                      System.out.println("FOP ExampleXML2PDF
                  ");
                                      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!

                  Thanks everybody for the tips and the help!

                  这篇关于FopFactory.newInstance() 时出现 Fop 异常的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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