Question

我编写了一个生成XML文件的代码。我坚持为XML定义doctype，因为它应该是公开的。我能够成功获得SYSTEM doctype，但不知何故无法获得用XML编写的公共doctype。下面的SYSTEM doctype代码正在运行，但PUBLIC doctype的相同代码段不起作用：

String xmldestpath = "C:/failed/tester.xml";
        doctype2 = CreateDoctypeString();

        StreamResult result =  new StreamResult(new File(xmldestpath ));
          try {
              transformer = transformerFactory.newTransformer();
              transformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM,"TEST");
              transformer.transform(source, result);
    //        logger.debug("COMPLETED Copying xml files /....!!");            

            System.out.println("COMPLETED Copying xml files to bulk import....!!");

不工作的代码段。它没有给出错误但是在结果xml中没有出现doctype：

 String xmldestpath = "C:/failed/tester.xml";
    doctype2 = CreateDoctypeString();

    StreamResult result =  new StreamResult(new File(xmldestpath ));
      try {
          transformer = transformerFactory.newTransformer();
          transformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC,"TEST");
          transformer.transform(source, result);
//        //logger.debug("COMPLETED Copying xml files /....!!");              

        System.out.println("COMPLETED Copying xml files to bulk import....!!");

Answer 1

如果你知道你需要/想要PUBLIC，也许你应该知道没有系统文字就不能存在公共文字。

XML specification显示：

ExternalID  ::=  'SYSTEM' S SystemLiteral
                 | 'PUBLIC' S PubidLiteral S SystemLiteral

因此，应该很容易得出结论，您需要指定两者才能使其正常工作，如MCVE所示：

TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, "TEST1");
transformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, "TEST2");
transformer.transform(new StreamSource(new StringReader("<Root></Root>")),
                      new StreamResult(System.out));

输出

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE Root PUBLIC "TEST1" "TEST2">
<Root/>

DOM XML Public Doctype未出现在result xml文件中

1 个答案: