dom4j读取XML配置文件示例

XML配置文件内容如下:

<?xml version="1.0" encoding="UTF-8"?>
<config>
    <db-info>
        <driver-name>oracle.jdbc.driver.OracleDriver</driver-name>
        <url>jdbc:oracle:thin:@127.0.0.1:1521:ORCL</url>
        <username>username</username>
        <password>password</password>
    </db-info>
</config>

读取XML程序如下,利用单例模式:

package com.king.drp.util;

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

/**
 * 采用单例模式读取xml配置文件sys-config.xml
 * @author lijike
 *
 */
public class ConfigReader {

    //静态的私有成员变量
    private static ConfigReader instance = new ConfigReader();

    //公共的静态入口方法
    public static ConfigReader getInstance() {
        return instance;
    }

    private Document doc;

    private JdbcInfo jdbcInfo;

    public JdbcInfo getJdbcInfo() {
        return jdbcInfo;
    }

    //私有的构造方法
    private ConfigReader() {
        try {
            doc = new SAXReader().read(Thread.currentThread().getContextClassLoader().getResourceAsStream("sys-config.xml"));
            Element driverNameElt = (Element)doc.selectObject("/config/db-info/driver-name");
            Element urlElt = (Element)doc.selectObject("/config/db-info/url");
            Element usernameElt = (Element)doc.selectObject("/config/db-info/username");
            Element passwordElt = (Element)doc.selectObject("/config/db-info/password");
            jdbcInfo = new JdbcInfo();
            jdbcInfo.setDriverName(driverNameElt.getStringValue());
            jdbcInfo.setUrl(urlElt.getStringValue());
            jdbcInfo.setUsername(usernameElt.getStringValue());
            jdbcInfo.setPassword(passwordElt.getStringValue());
        } catch (DocumentException e) {
            e.printStackTrace();
        }
    }
}