JAVA读取XML文件
请用JAVA编一段程序 读取一个XML文件XML代码：
<?xml version="1.0" encoding="GB2312" ?>
<Root>
<Header left="100" Top="30">日报表</Header>
</Root>
并按照XML里描述的位置 把表头“日报表”三个字打印出来
import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
public class Xml {
public static void main(String[] args) {
try {
DocumentBuilderFactory factory = DocumentBuilderFactory
.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(new File("E:\\新建 文本文档 (3).xml"));
Element rootElement = document.getDocumentElement();
NodeList list = rootElement.getElementsByTagName("Header");
Element element = (Element) list.item(0);
System.out.println(element.getChildNodes().item(0).getNodeValue());
} catch (Exception e) {
System.out.println("exception:" + e.getMessage());
}
}
}
用 java 从 XML 文件里按照位置提取一些数据的方法有 3 种以上。最直观、方便的是利用 XPath 表达式：
import javax.xml.xpath.*;
import org.xml.sax.*;
class ExtractXMLDataByXpath {
public static void main(String[] args) throws Exception {
XPath xpathEngine = XPathFactory.newInstance().newXPath();
String xpathExpression = "/Root/Header/text()";
InputSource xmlSource = new InputSource("C:\\a.xml"); // 假设 XML 文件路径为 C:\a.xml
System.out.println(xpathEngine.evaluate(xpathExpression, xmlSource));
}
}
页:
[1]