使用XPath Java在标记中读取
使用XPath Java在标记中读取
提问于 2014-03-13 08:05:28
我刚开始使用Java读取XML，我的问题是，我一直在尝试读取xml，在特定的标记之间，我想要获得所需的数据，我正在使用XPath，而我的查询是：
String expression = "/ADOXML/MODELS/MODEL/MODELATTRIBUTES/ATTRIBUTE[@type='STRING']";它工作得很好，我的特定标记可以从以下位置读取：
<ATTRIBUTE name="Description" type="STRING"> SOME TEXT </ATTRIBUTE>但是我只想在这些类型的标记中读取数据，这样我的输出应该是：
SOME TEXT在标签里面！有人能帮我吗?我怎么能做到这一点?我刚开始读xml！尽我最大的努力：
String expression = "/ADOXML/MODELS/MODEL/MODELATTRIBUTES/ATTRIBUTE[@name='Description' and ./type/text()='STRING']";但是它不会给我任何输出！提前感谢
我的守则：
DocumentBuilderFactory builderFactory =
DocumentBuilderFactory.newInstance();
DocumentBuilder builder = null;
try {
builder = builderFactory.newDocumentBuilder();
org.w3c.dom.Document document = builder.parse(
new FileInputStream("c:\\y.xml"));
XPath xPath = XPathFactory.newInstance().newXPath();
String expression = "/ADOXML/MODELS/MODEL/MODELATTRIBUTES/ATTRIBUTE[@name='Description'and @type='STRING']";
System.out.println(expression);
NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(document, XPathConstants.NODESET);
for (int i = 0; i < nodeList.getLength(); i++) {
System.out.println(nodeList.item(i).getFirstChild().getNodeValue());
}
} catch (ParserConfigurationException | SAXException | IOException e) {
System.out.print(e);
} 我的代码出了问题，搞不清楚是什么！
回答 2
Stack Overflow用户
回答已采纳
发布于 2014-03-13 08:24:13
这段代码在修改后的XPath中运行良好，可以：
"/ADOXML/MODELS/MODEL/MODELATTRIBUTES/ATTRIBUTE[@name='Description'][@type='STRING']"
private static final String EXAMPLE_XML =
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
"<ADOXML adoversion=\"Version 5.1\" username=\"kvarga\" database=\"adonisdb\" time=\"08:55\" date=\"30.11.2013\" version=\"3.1\">" +
"<MODELS>" +
"<MODEL version=\"\" applib=\"ADONIS BPMS BP Library 5.1\" libtype=\"bp\" modeltype=\"Business process model\" name=\"Product development\" id=\"mod.25602\">" +
"<MODELATTRIBUTES>" +
"<ATTRIBUTE name=\"Version number\" type=\"STRING\"> </ATTRIBUTE>" +
"<ATTRIBUTE name=\"Author\" type=\"STRING\">kvarga</ATTRIBUTE>" +
"<ATTRIBUTE name=\"Description\" type=\"STRING\">I WANT THIS PARA 2</ATTRIBUTE>" +
"</MODELATTRIBUTES>" +
"</MODEL>" +
"</MODELS>" +
"</ADOXML>";
public static void main(String[] args) {
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = null;
try {
builder = builderFactory.newDocumentBuilder();
Document document = builder.parse(new ByteArrayInputStream(EXAMPLE_XML.getBytes()));
XPath xPath = XPathFactory.newInstance().newXPath();
String expression = "/ADOXML/MODELS/MODEL/MODELATTRIBUTES/ATTRIBUTE[@name='Description'][@type='STRING']";
NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(document, XPathConstants.NODESET);
for (int i = 0; i < nodeList.getLength(); i++) {
System.out.println("###" + nodeList.item(i).getFirstChild().getNodeValue() + "###");
}
} catch (Exception e) {
System.out.print(e);
}
}产出：
###I WANT THIS PARA 2###Stack Overflow用户
发布于 2014-03-13 08:38:19
上述代码工作正常。
你也可以尝试其他方法来获取文本节点-
String expression = "/ADOXML/MODELS/MODEL/MODELATTRIBUTES/ATTRIBUTE/text()";
NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(document, XPathConstants.NODESET);
System.out.println(nodeList.item(0).getNodeValue());页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/22372533
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