如何在java中的某个元素之后/之前将元素插入到xml中
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How can I insert element into xml after/before certain element in java
提问by ant
Here is my code, maybe you will notice right away what I'm missing :
这是我的代码，也许您会立即注意到我遗漏了什么：
DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = domFactory.newDocumentBuilder();
Document doc = builder.parse(fileName));
XPathFactory factory = XPathFactory.newInstance();
XPath xpath = factory.newXPath();
XPathExpression expr = xpath.compile("//CustomerId");
Object result = expr.evaluate(doc, XPathConstants.NODESET);
Nodelist nodes = (NodeList) result;
Text a = doc.createTextNode("value");
Element p = doc.createElement("newNode");
p.appendChild(a);
for (int i = 0; i < nodes.getLength(); i++) {
nodes.item(i).insertBefore(p, nodes.item(i));
}
I'm trying to insert new node(<newNode>value</newNode>) before CustomerId existing node. Here is my XML sample file :
我正在尝试<newNode>value</newNode>在 CustomerId 现有节点之前插入新节点（）。这是我的 XML 示例文件：
<Customer>
<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>
<CustomerId/>
<SSN>561381</SSN>
<phone>
<homePhone>123123123</homePhone>
<officePhone/>
<homePhone>21319414</homePhone>
</phone>
<preferred>true</preferred>
</Customer>
This is an exception getting thrown I just don't know what else to try :
这是一个异常被抛出我只是不知道还能尝试什么：
NOT_FOUND_ERR: An attempt is made to reference a node in a context where it does not exist.
NOT_FOUND_ERR：尝试在不存在的上下文中引用节点。
采纳答案by Garett
Here an example I just tested using the xml sample you provided.
这是我刚刚使用您提供的 xml 示例测试的示例。
DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
domFactory.setIgnoringComments(true);
DocumentBuilder builder = domFactory.newDocumentBuilder();
Document doc = builder.parse(new File("XmlTest.xml"));
NodeList nodes = doc.getElementsByTagName("CustomerId");
Text a = doc.createTextNode("value");
Element p = doc.createElement("newNode");
p.appendChild(a);
nodes.item(0).getParentNode().insertBefore(p, nodes.item(0));
Here is the result:
结果如下：
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<Customer>
<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>
<newNode>value</newNode>
<CustomerId/>
<SSN>561381</SSN>
<phone>
<homePhone>123123123</homePhone>
<officePhone/>
<homePhone>21319414</homePhone>
</phone>
<preferred>true</preferred>
</Customer>
If you're interested, here's the sample code I used to show the result:
如果您有兴趣，这里是我用来显示结果的示例代码：
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
StreamResult result = new StreamResult(new StringWriter());
DOMSource source = new DOMSource(doc);
transformer.transform(source, result);
String xmlOutput = result.getWriter().toString();
System.out.println(xmlOutput);
回答by Curtis
I think you want to insert into the parent, not the child:
我认为您想插入父级，而不是子级：
nodes.item(i).getParentNode().insertBefore(p, nodes.item(i));
