用Java获取XML中标记的属性值
我正在尝试用Java将text2替换为其他内容。我在使用此代码时遇到问题:用Java获取XML中标记的属性值,java,xml,transformer,Java,Xml,Transformer,我正在尝试用Java将text2替换为其他内容。我在使用此代码时遇到问题: try { String filepath = "c:\\path\\file.xml"; DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder docBuilder = docFactory.newDocumentBuilder(); Document doc =
try {
String filepath = "c:\\path\\file.xml";
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
Document doc = docBuilder.parse(filepath);
Node a = doc.getFirstChild();
Node b = doc.getElementsByTagName("b").item(0);
NodeList list = b.getChildNodes();
for (int i = 0; i < list.getLength(); i++) {
Node node = list.item(i);
if ("c".equals(node.getNodeName())) { //Want to add '&& attribute value of key is 4'
node.setTextContent("new text");
}
}
// write the content into xml file
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(new File(filepath));
transformer.transform(source, result);
System.out.println("Done");
} catch (ParserConfigurationException pce) {
pce.printStackTrace();
} catch (TransformerException tfe) {
tfe.printStackTrace();
} catch (IOException ioe) {
ioe.printStackTrace();
} catch (SAXException sae) {
sae.printStackTrace();
}
试试看{
String filepath=“c:\\path\\file.xml”;
DocumentBuilderFactory docFactory=DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder=docFactory.newDocumentBuilder();
Document doc=docBuilder.parse(文件路径);
节点a=doc.getFirstChild();
节点b=doc.getElementsByTagName(“b”)。项(0);
NodeList list=b.getChildNodes();
对于(int i=0;i
这就是XML的外观:
<?xml version="1.0" encoding="utf-8">
<a>
<b id="1">
<c key="3">text1</c>
<c key="4">text2</c> //Replace this
</b>
<b id="2">
<c key="5">text3</c>
<c key="6">text4</c>
</b>
</a>
并且目前在这一行transformer.transform(源、结果)上给了我一个错误
对于这样简单的事情,您可以使用XPath,表达式为“//c[@key='4']]”
,这意味着:在任何级别查找名为key
的属性值为4
的
元素
Document doc=DocumentBuilderFactory.newInstance()
.newDocumentBuilder()
.parse(“file.xml”);
节点c4=(节点)XPathFactory.newInstance()
.newXPath()
.evaluate(“/c[@key='4']”,doc,XPathConstants.NODE);
c4.内容(“新文本”);
TransformerFactory.newInstance()
.新变压器()
.transform(新DOMSource(doc),
新的StreamResult(System.out));
输出
文本1
新文本
文本3
文本4