使用xpath更新xml
使用xpath更新xml
提问于 2015-11-30 01:56:54
我只想更改jojo餐厅的评级，我尝试了这个代码，但没有工作，请帮助。下面是我的xml文档和代码。
<city>
<beirut>
<restaurant>
<name>sada</name>
</restaurant>
</beirut>
<jbeil>
<restaurant>
<name>toto</name>
<rating>4.3/5</rating>
</restaurant>
<restaurant>
<name>jojo</name>
<rating>4.3/5</rating>
</restaurant>
</jbeil>
<sour>
<restaurant>
<name>sada</name>
</restaurant>
</sour>
</city>代码：
try {
File inputFile = new File("src/xpath/josephXml.xml");
DocumentBuilderFactory dbFactory
= DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder;
dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(inputFile);
doc.getDocumentElement().normalize();
XPath xPath = XPathFactory.newInstance().newXPath();
String expression = "/City/Jbeil/Restaurants/Restaurant[name='Feniqia']/rating";
Element e = (Element)xPath.evaluate(expression, doc, XPathConstants.NODE);
if (e != null){
e.setTextContent("5/5");
}
} catch (ParserConfigurationException | SAXException | IOException e) {
}回答 2
Stack Overflow用户
发布于 2015-11-30 06:04:26
如果您只需要编写结果(还有其他方法)：
导入java.io.File；
import org.w3c.dom.Document;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
try
{
Transformer trans = TransformerFactory.newInstance().newTransformer();
Result out = new StreamResult(new File("result.xml"));
Source in = new DOMSource(doc);
trans.transform(in, out);
}
catch (Exception exe)
{
System.err.println(exe.getMessage());
}Stack Overflow用户
发布于 2015-11-30 06:16:15
首先，您的XPath没有与发布的XML对齐(没有<restaurants>或Feniqia名称)，而且所有内容都应该是小写的。您可能从大型xml文档中提取了一部分。为了进行演示，我使用了jojo餐厅。
其次，XPath本身不会更新XML，您需要创建一个新文档。只需在结尾处添加一个转换：
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.stream.*;
import javax.xml.xpath.*;
import java.io.File;
import java.io.IOException;
import org.xml.sax.*;
import org.w3c.dom.*;
public class RatingUpdate {
public static void main(String [] args) {
try {
File inputFile = new File("src/xpath/josephXml.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder;
dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(inputFile);
doc.getDocumentElement().normalize();
XPath xPath = XPathFactory.newInstance().newXPath();
String expression = "/city/jbeil/restaurant[name='jojo']/rating";
Element e = (Element)xPath.evaluate(expression, doc, XPathConstants.NODE);
if (e != null){
e.setTextContent("5/5");
}
Transformer xformer = TransformerFactory.newInstance().newTransformer();
xformer.transform(new DOMSource(doc), new StreamResult(new File("src/xpath/josephXml_update.xml")));
} catch (ParserConfigurationException | SAXException | IOException | XPathExpressionException |
TransformerException e) {
}
}
}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/33986034
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