Dom4J使用(Xpath)-优快云博客

本文介绍了一个Java程序，该程序使用Dom4J库来解析web.xml文件，并从中提取context-param参数名称及其值，同时获取所有servlet的名称及对应的类名。

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import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;


public class Dom4JTest
{
    public static void main (String[] args)
    {
        String PATH = System.getProperty("user.dir")+File.separator;
        SAXReader reader = new SAXReader();
        try
        {
            Document dom = reader.read(new FileInputStream(PATH+"web.xml"));
            System.out.println(dom.asXML());
            Node node = dom.selectSingleNode("//context-param/param-name");
            System.out.println(node.getText());
            String value = dom.valueOf("//context-param/param-value");
            System.out.println(value);
            System.out.println("-----------------------------------");
            List<Node> list = dom.selectNodes("//servlet");
            for (Node node2 : list)
            {
                String name2 = node2.valueOf("servlet-name");
                String value2 = node2.valueOf("servlet-class");
                System.out.println(name2+":"+value2);
            }
        }
        catch (FileNotFoundException e)
        {
            e.printStackTrace();
        }
        catch (DocumentException e)
        {
            e.printStackTrace();
        }
    }

}

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
	
	<context-param>
		<param-name>name</param-name>
		<param-value>this is the context param value</param-value>
	</context-param>
	
	<servlet>
		<servlet-name>TestServlet1</servlet-name>
		<servlet-class>TestServlet1</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet>
		<servlet-name>TestServlet2</servlet-name>
		<servlet-class>TestServlet2</servlet-class>
		<load-on-startup>2</load-on-startup>
	</servlet>

	<servlet>
		<servlet-name>TestServlet3</servlet-name>
		<servlet-class>TestServlet3</servlet-class>
		<load-on-startup>3</load-on-startup>
	</servlet>

	<servlet>
		<servlet-name>TestServlet4</servlet-name>
		<servlet-class>TestServlet4</servlet-class>
		<load-on-startup>4</load-on-startup>
	</servlet>
</web-app>