java - Xpath Xquery : unable to add 在 xml 中，而它存在于源 xml 文件中

Question

我正在修改现有配置XML文件的一些节点。它包含<!DOCTYPE>线。

使用 Xquery 表达式更改 XML 文件后，生成的 XML 文件包含除 <!DOCTYPE> 之外的所有数据。线。

所以，我想要<!DOCTYPE>生成的 XML 文件中也包含这一行。

我的源 XML 文件:带有 <!DOCTYPE>线

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE hibernate-configuration SYSTEM "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="c3p0.autoCommitOnClose">false</property>
        <property name="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

我生成的 XML 文件:没有 <!DOCTYPE>线，但我想要它

<?xml version="1.0" encoding="UTF-8" standalone="no"?><hibernate-configuration>
    <session-factory>
        <property name="c3p0.autoCommitOnClose">false</property>
        <property name="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

我的读写逻辑代码是:

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

        DocumentBuilder builder;
        Document doc = null;
        XPathExpression expr = null;
        Node attributeElement = null;
        try {

            builder = factory.newDocumentBuilder();
            // creating input stream
            doc = builder.parse(file);
            XPathFactory xpf = XPathFactory.newInstance();
            XPath xpath = xpf.newXPath();

            //expr = xpath.compile("/sitemesh/mapping/@decorator");
            expr = xpath.compile("/hibernate-configuration/session-factory/property/@name='connection.url'");
            attributeElement = (Node) expr.evaluate(doc, XPathConstants.NODE);
            System.out.println("value:"+attributeElement.getNodeValue());

            //attributeElement.setNodeValue("/WEB-INF/views/decorators/" + themeName);

        } catch (Exception e) {
            System.out.println("e:"+e);
        }


        // writing xml file
        TransformerFactory transformerFactory = TransformerFactory
                .newInstance();
        Transformer transformer;
        try {
            transformer = transformerFactory.newTransformer();
            DOMSource source = new DOMSource(doc);
            StreamResult result = new StreamResult(file);// creating output
                                                            // stream
            transformer.transform(source, result);
        } catch (Exception e) {
        }

仅更改 XML 文件的某些节点后，生成的文件不包含任何 <!DOCTYPE>线

请帮忙，如何添加<!doctype>我生成的 xml 中的一行。谢谢

Answer 1

我得到了答案。编辑后写入文件时...

transformer = transformerFactory.newTransformer();
            transformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM,
                            "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd");
            DOMSource source = new DOMSource(doc);
            StreamResult result = new StreamResult(file);// creating output
                                                            // stream
            transformer.transform(source, result);

只需将OutPutProperty....设置为您想要的任何内容

谢谢