用XMLJdbcConfigReader简单读取XML配置文件

Etwo

步骤1、编写xml配置文件；2、编写实体类JdbcConfig；3、在编写XMLJdbcConfigReader来读取xml配置文件。
步骤1、编写xml配置文件
 
<?xml version="1.0" encoding="utf-8"  ?><!--数据库相关信息: 1、驱动；2、url；3、user；4、password--><config><db-info><driver-name>com.mysql.jdbc.Driver</driver-name><url>jdbc:mysql://localhost:3306/test?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8</url><user-name>root</user-name><password>root</password></db-info></config>   
步骤2、编写实体类JdbcConfig
package net.etwo.model;public class JdbcConfig {/*** 数据库相关信息* 1、驱动；2、url；3、user；4、password*/private String driverName;private String url;private String user;private String password;public String getDriverName() {return driverName;}public void setDriverName(String driverName) {this.driverName = driverName;}public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}public String getUser() {return user;}public void setUser(String user) {this.user = user;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}@Overridepublic String toString() {// TODO Auto-generated method stubreturn "driverName:" + this.driverName + "\nurl:" + this.url + "\nuser:" + this.user + "\npassword:" + this.password;}} 

步骤3、在编写XMLJdbcConfigReader来读取xml配置文件
 
package net.etwo.util;import java.io.InputStream;import net.etwo.model.JdbcConfig;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.SAXReader;public class XMLJdbcConfigReader {/*** 采用单例模式解析XML*/private static XMLJdbcConfigReader instance;private static JdbcConfig jdbcConfig = new JdbcConfig();private XMLJdbcConfigReader() {//解析XMLInputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream("sys-config.xml");SAXReader reader = new SAXReader();try {Document doc = reader.read(is);Element eleDriverName = (Element)doc.selectObject("/config/db-info/driver-name");Element eleUrl = (Element)doc.selectObject("/config/db-info/url");Element eleUser = (Element)doc.selectObject("/config/db-info/user-name");Element elePassword = (Element)doc.selectObject("/config/db-info/password");String driverName = eleDriverName.getStringValue();String url = eleUrl.getStringValue();String user = eleUser.getStringValue();String password = elePassword.getStringValue();jdbcConfig.setDriverName(driverName);jdbcConfig.setUrl(url);jdbcConfig.setUser(user);jdbcConfig.setPassword(password);} catch (DocumentException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public static synchronized XMLJdbcConfigReader getInstance() {if(instance ==null) {instance = new XMLJdbcConfigReader();}return instance;}public JdbcConfig getJdbcConfig() {return jdbcConfig;}public static void main(String[] args) {new XMLJdbcConfigReader().getInstance();System.out.println(jdbcConfig);}}