java - Java 中的 XML 空格格式

Question

我在 Java 中格式化空白时遇到问题。我向文件添加了新属性，但格式不正确。

    Attr attr = doc.createAttribute("name");
    attr.setValue("name");
    element.setAttributeNode(attr);
    element.setTextContent("Something=" + this.thumbnailCacheSize);

    NodeList items = doc.getElementsByTagName("mbean");
    Node e = items.item(0);
    e.appendChild(element);
    TransformerFactory transformerFactory = TransformerFactory.newInstance();
    Transformer transformer = transformerFactory.newTransformer();
    transformer.setOutputProperty(OutputKeys.INDENT,"yes");
    DOMSource source = new DOMSource(doc);
    StreamResult result = new StreamResult(filepath);

    transformer.transform(source,result);

它应该看起来像这样:

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <server>
   <mbean code="code" name="name">
     <attribute name="name3">Something3=500</attribute>
     <attribute name="name2">Something2=500</attribute>
     <attribute name="name1">Something1=500</attribute>
     <attribute name="name">Something=500</attribute>
   </mbean>
 </server>

但是就像:

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <server>
 <mbean code="code" name="name">
     <attribute name="name3">Something3=500</attribute>
     <attribute name="name2">Something2=500</attribute>
     <attribute name="name1">Something1=500</attribute>
   <attribute name="name">Something=500</attribute>
 </mbean>
 </server>

当我使用时: Transformer.setOutputProperty("{ http://xml.apache.org/xslt }缩进量", "4");

我得到:

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <server>
 <mbean code="code" name="name">
     <attribute name="name3">Something3=500</attribute>
     <attribute name="name2">Something2=500</attribute>
     <attribute name="name1">Something1=500</attribute>
   <attribute name="name">Something=500</attribute>
     </mbean>
 </server>

Answer 1

试试这个。

Transformer transformer = transformerFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes"); // enable indent
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4"); // 4 is indent space (default is zero)