java - 在Java中解析xml时是否可以忽略/跳过节点

Question

我正在尝试从此 XML 中删除 SOAP 和 ns2 节点:

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"       SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<SOAP-ENV:Body>
<ns2:createCustomer>
    <Customer>
        <CustomerId/>
        <names>
            <firstName>fName</firstName>
            <lastName>lName</lastName>
            <middleName>nName</middleName>
            <nickName/>
            </names>
        <addressList>
            <address>
                <streetInfo>
                    <houseNumber>22</houseNumber>
                    <baseName>Street base name</baseName>
                    <district>kewl district</district>
                    </streetInfo>
                <zipcode>22231</zipcode>
                <state>xxx</state>
                <country>xxxz</country>
                <primary>true</primary>
                </address>
            </addressList>
        <SSN>561381</SSN>
        <phone>
            <homePhone>123123123</homePhone>
            <officePhone/>
            <homePhone>21319414</homePhone>
            </phone>
        <preferred>true</preferred>
        </Customer>
        </ns2:createCustomer>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

在此之前这可能吗:

Document doc = parser.parse(xmlFile); 
NodeList startlist = doc.getChildNodes();

我尝试将其作为字符串读取，然后像这样将其写回 XML 文件:

private void preParsing(String fileName,String ...tags) {

        try {

            BufferedReader br = new BufferedReader(new FileReader(new File(fileName)));
            StringBuilder sb = new StringBuilder();
            String line;

            while ((line = br.readLine()) != null) {
                for (String string : tags) {
                    if(!line.contains(string)){
                        sb.append(line);
                        sb.append("\n");
                    }
                }
            }           

            System.out.println(sb.toString());

            br.close();

        } catch (IOException e) {
            System.err.println("Error occured: " + e.getMessage());
        }

    }

如果我只忽略一个标签，它会起作用:

preParsing("src/main/resources/test.xml", "SOAP");

但当我传递多个标记参数以忽略/从文件中删除时，它不起作用。我敢肯定有更优雅的方式来做到这一点，我只是想不出任何。

Answer 1

您可以使用 StAX filter :

class MyFilter implements EventFilter {
  private final List<String> filtered = Arrays.asList("SOAP-ENV:Envelope",
      "SOAP-ENV:Body", "ns2:createCustomer");

  @Override
  public boolean accept(XMLEvent event) {
    if (event.isStartElement())
      for (String elementName : filtered)
        if (event.asStartElement().getName().getLocalPart().equals(
            elementName))
          return false;
    if (event.isEndElement())
      for (String elementName : filtered)
        if (event.asEndElement().getName().getLocalPart().equals(
            elementName))
          return false;
    return true;
  }
}

用法:

DOMResult result = new DOMResult();
XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();
xmlInputFactory.setProperty(XMLInputFactory.IS_NAMESPACE_AWARE, false);
XMLEventReader reader = xmlInputFactory
    .createXMLEventReader(new StreamSource(new File("soap.xml")));
reader = xmlInputFactory.createFilteredReader(reader, new MyFilter());
TransformerFactory transFactory = TransformerFactory.newInstance();
Transformer transformer = transFactory.newTransformer();
transformer.transform(new StAXSource(reader), result);
Document document = (Document) result.getNode();

仅供引用:SOAP-ENV 和 ns2 不是元素；它们是 namespace 前缀。文档格式错误 - 缺少命名空间声明，上面的代码不是我为有效的命名空间文档编写的代码。