用于读取xml配置文件的工具类XMLUtil

用于读取xml配置文件的工具类XMLUtil：

XMLUtil.java:

import org.w3c.dom.*;
import javax.xml.parsers.*;
import org.xml.sax.SAXException;
import java.io.*;

    public class XMLUtils {
        public static Object getBean(){
            try {
                //创建文档对象
                DocumentBuilderFactory dFactory = DocumentBuilderFactory.newInstance();
                DocumentBuilder builder = dFactory.newDocumentBuilder();
                Document doc;
                doc = builder.parse(new File("src/BuilderPattern/utils/config.xml"));
                //获取包含支付方式名称的文本节点
                NodeList nl = doc.getElementsByTagName("className");
                Node classNode=nl.item(0).getFirstChild();
                String cName=classNode.getNodeValue();
                //通过类名生成实例对象并将其返回
                Class c=Class.forName(cName);
                Object obj=c.newInstance();
                return obj;
            }catch (Exception e){
                e.printStackTrace();
                return null;
            }
        }
    }

 

config.xml:

<?xml version="1.0"?>
<config>
    <className>BuilderPattern.SubMealBuilder.SubMealBuilderA</className>
</config>