[英]How do I use xpath in Java to find a node value or attribute in an xml and replace it with another value?
這是我的代碼到目前為止:
// locate the node(s)
XPath xpath = XPathFactory.newInstance().newXPath();
NodeList nodes = (NodeList)xpath.evaluate("//root[text()='input[1]']", doc, XPathConstants.NODESET);
// make the change
for (int idx = 0; idx < nodes.getLength(); idx++) {
nodes.item(idx).setTextContent(input[3]);
}
// save the result
Transformer xformer = TransformerFactory.newInstance().newTransformer();
xformer.transform(new DOMSource(doc), new StreamResult(new File(outputFile)));
輸入[1]是我在XML中尋找的東西,輸入[3]就是它被替換的內容。
這是XML:
<root>
<accounts>
<account name="Bill Gates">
<position>CEO</position>
<phoneNumber>123-485-1854</phoneNumber>
<notes>Runs the company</notes>
</account>
<account name="Service Account"/>
<account name="Burt Mackland">
<position>CFO</position>
<phoneNumber>345-415-4813</phoneNumber>
<notes>Great CFO</notes> </account>
<account name="Joe Smith">
<position>Accountant</position>
<reportsTo>Burt Mackland</reportsTo>
<phoneNumber>135-118-7815</phoneNumber>
<notes>Must have ID checked at all Gates</notes>
</account>
</accounts>
<departments>
<deparment name="Finance">
<employeeCount>2</employeeCount>
</deparment>
<department name="Human Resources">
<employeeCount>0</employeeCount>
</department>
<department name="Executive">
<employeeCount>2</employeeCount>
</department>
</departments>
</root>
用戶可能不知道XML中的內容。 所以我不能在代碼中硬編碼Xpath。 請任何不勝感激!
由於您要在任何元素(不僅是<root>
)中搜索文本,請從中更改XPath表達式
//root[text()='TEXT-TO-BE-FOUND']
至
//*[text()='TEXT-TO-BE-FOUND']
要查找具有相同值的所有屬性,必須使用以下XPath表達式:
//*/@*[.='TEXT-TO-BE-FOUND']
此外,由於您無法進行硬編碼,因此將TEXT-TO-BE-FOUND
變量。 (注意: TEXT-TO-BE-FOUND
必須被轉義 ,它可能不包含'
因為它會影響XPath表達式。)
import java.io.File;
import java.util.Scanner;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.*;
import org.w3c.dom.*;
public class XmlChange {
public static void main(String argv[]) throws Exception {
Scanner keyboard = new Scanner(System.in);
System.out.print("Type like textToFind,textToReplace: "); // type, for example CEO,Chief Executive Officer
String next = keyboard.nextLine();
String[] input = next.split(",");
String textToFind = input[0].replace("'", "\\'"); //"CEO";
String textToReplace = input[1].replace("'", "\\'"); // "Chief Executive Officer";
String filepath = "root.xml";
String fileToBeSaved = "root2.xml";
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
Document doc = docBuilder.parse(filepath);
XPath xpath = XPathFactory.newInstance().newXPath();
// change ELEMENTS
String xPathExpression = "//*[text()='" + textToFind + "']";
NodeList nodes = (NodeList) xpath.evaluate(xPathExpression, doc, XPathConstants.NODESET);
for (int idx = 0; idx < nodes.getLength(); idx++) {
nodes.item(idx).setTextContent(textToReplace);
}
// change ATTRIBUTES
String xPathExpressionAttr = "//*/@*[.='" + textToFind + "']";
NodeList nodesAttr = (NodeList) xpath.evaluate(xPathExpressionAttr, doc, XPathConstants.NODESET);
for(int i=0; i<nodesAttr.getLength(); i++) {
nodesAttr.item(i).setTextContent(textToReplace);
}
System.out.println("Everything replaced.");
// save xml file back
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(new File(fileToBeSaved));
transformer.transform(source, result);
}
}
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