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jdom XPath 解析配置文件（不错的设计思想）

Posted on 2009-07-29 00:02 Gavin.lee 阅读(598) 评论(0)  编辑  收藏 所属分类: xml doc 操作
jdom xpath
今天的空，回味一下勇哥的视频，敲了一段他的程序，感觉整个思想还是不错的。利用Xpath，虽然我一直在用dom4j，多少对jdom还是挺关注的。

PS：2009-8-8 17:24:15
之前这个测试程序还一直会有问题，
后来解决了，问题就是我没用到最新JDOM包，这个问题，总是会让人很郁闷。

<?xml version="1.0" encoding="UTF-8"?>
<sys-configure>
    <jdbc-info>
        <driver-class-name>net.sourceforge.jtds.jdbc.Driver</driver-class-name>
        <url>jdbc:jtds:sqlserver://121.14.110.49:1433/wubai_wapcp</url>
        <username>wap</username>
        <password>esunxyz500wan!^wap</password>
    </jdbc-info>
    <!--N多的bean-->
    <beans>
        <bean id="com.Gavin.jdomXpath.Test1" class="com.Gavin.jdomXpath.Test1"></bean>
        <bean id="com.Gavin.jdomXpath.Test2" class="com.Gavin.jdomXpath.Test2"></bean>
        <bean id="com.Gavin.jdomXpath.Test3" class="com.Gavin.jdomXpath.Test3"></bean>
        <bean id="com.Gavin.jdomXpath.Test4" class="com.Gavin.jdomXpath.Test4"></bean>
        <bean id="com.Gavin.jdomXpath.Test5" class="com.Gavin.jdomXpath.Test5"></bean>
    </beans>
</sys-configure>

package com.Gavin.jdomXpath;

import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.log4j.Logger;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.xpath.XPath;


public class GlobalConfigure {

    private static Logger logger = Logger.getLogger(GlobalConfigure.class);
    
    private static GlobalConfigure instance = new GlobalConfigure();
    
    private JdbcInfo jdbcInfo = new JdbcInfo();
    
    private Map<String, Object> beanMap = new HashMap<String, Object>();
    
    private static final String CONFIGE_FILE_NAME = "global_configure.xml";
    
    private Element rootElt;
    
    public static GlobalConfigure getInstance() {
        return instance;
    }
    
    private GlobalConfigure() {
        SAXBuilder sb = new SAXBuilder();
        try {
            Document doc = sb.build(Thread.currentThread().getContextClassLoader().getResourceAsStream(CONFIGE_FILE_NAME));
            this.rootElt = doc.getRootElement();
            initJdbcInfo();

            initBeans();
        } catch (JDOMException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    public JdbcInfo getJdbcInfo() {
        return jdbcInfo;
    }
    
    public Object getBean(Class c) {
        return beanMap.get(c.getName());
    }
    
    private void initJdbcInfo() {
        try {
            Element driverClassNameElt = (Element)XPath.selectSingleNode(rootElt, "//sys-configure/jdbc-info/driver-class-name");
            Element urlElt = (Element)XPath.selectSingleNode(rootElt, "//sys-configure/jdbc-info/url");
            Element usernameElt = (Element)XPath.selectSingleNode(rootElt, "//sys-configure/jdbc-info/username");
            Element passwordElt = (Element)XPath.selectSingleNode(rootElt, "//sys-configure/jdbc-info/password");
            logger.debug(urlElt.getText());
            jdbcInfo.setDriverClassName(driverClassNameElt.getText());
            jdbcInfo.setUrl(urlElt.getText());
            jdbcInfo.setUsername(usernameElt.getText());
            jdbcInfo.setPassword(passwordElt.getText());
        } catch (JDOMException e) {
            e.printStackTrace();
        }
    }
    
    private void initBeans() {
        try {
            List<Element> beanList = XPath.selectNodes(rootElt, "//sys-configure/beans/bean");
            for(Iterator<Element> it = beanList.iterator(); it.hasNext();) {
                Element beanElt = (Element)it.next();
                String id = beanElt.getAttributeValue("id");
                String className = beanElt.getAttributeValue("class");
                
                Object obj = Class.forName(className).newInstance();
                beanMap.put(id, obj);
            }            
        } catch (JDOMException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        
        GlobalConfigure.getInstance().getJdbcInfo().toString();
        
//        Test1 t = (Test1)GlobalConfigure.getInstance().getBean(Test1.class);
        
        System.out.println("uuu");

    }
}


package com.Gavin.jdomXpath;

public class JdbcInfo {
    private String driverClassName;
    private String url;
    private String username;
    private String password;
    
    public String getDriverClassName() {
        return driverClassName;
    }
    public void setDriverClassName(String driverClassName) {
        this.driverClassName = driverClassName;
    }
    public String getUrl() {
        return url;
    }
    public void setUrl(String url) {
        this.url = url;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String toString() {
        return "JdbcInfo {driver-class-name:" + this.driverClassName
            + "url:" + this.url
            + "username:" + this.username
            + "password:" + this.password + "}";
    }
}

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