使用JDom操作XML

global-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<sys-config>
    <jdbc-info>
        <driver-class-name>oracle.jdbc.driver.OracleDriver</driver-class-name>
        <url>jdbc:oracle:thin:@127.0.0.1:1521:xe</url>
        <username>scott</username>
        <password>tiger</password>
    </jdbc-info>
    <beans>
        <bean id="test" class="com.taoistwar.test.jdom.ReadXML"/>
    </beans>
</sys-config>

 

读取XML

com.taoistwar.test.jdom.GlobalConfig.java

package com.taoistwar.test.jdom;

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

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

public class GlobalConfig {
    private static GlobalConfig instance = new GlobalConfig();

    private static final String Config_File_Name = "global-config.xml";

    private Element rootELt;

    private JdbcInfo jdbcInfo = new JdbcInfo();

    private Map beanMap = new HashMap();
   
    private GlobalConfig() {
        SAXBuilder sb = new SAXBuilder();
        try {
            Document document = sb.build(Thread.currentThread()
                    .getContextClassLoader().getResourceAsStream(
                            Config_File_Name));
            this.rootELt = document.getRootElement();
            initJdbcInfo();
            initBeans();
        } catch (JDOMException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static GlobalConfig getInstance() {
        return instance;
    }

    public void initJdbcInfo() {
        try {
            Element driverClassNameElt = (Element) XPath.selectSingleNode(
                    this.rootELt, "//sys-config/jdbc-info/driver-class-name");
            jdbcInfo.setDriverClassName(driverClassNameElt.getText());
            Element urlElt = (Element) XPath.selectSingleNode(this.rootELt,
                    "//sys-config/jdbc-info/url");
            jdbcInfo.setUrl(urlElt.getText());
            Element usernameElt = (Element) XPath.selectSingleNode(
                    this.rootELt, "//sys-config/jdbc-info/username");
            jdbcInfo.setUsername(usernameElt.getText());
            Element passwordElt = (Element) XPath.selectSingleNode(
                    this.rootELt, "//sys-config/jdbc-info/password");
            jdbcInfo.setUrl(passwordElt.getText());
        } catch (JDOMException e) {
            e.printStackTrace();
        }
    }

    public void initBeans() {
        try {
            List list = (List) XPath.selectNodes(this.rootELt,
                    "//sys-config/beans/bean");
            for (Iterator iter = list.iterator(); iter.hasNext();) {
                Element elt = (Element) iter.next();
                String id = elt.getAttributeValue("id");
                String cls = elt.getAttributeValue("class");
                beanMap.put(id, Class.forName(cls).newInstance());
            }
        } catch (JDOMException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }

    public Object getBean(String id) {
        Object o = beanMap.get(id);
        return o;
    }
   
    public static void main(String[] args) {
        ReadXML r = (ReadXML) GlobalConfig.getInstance().getBean("test");
        r.p("test F");
    }

}

 

 

com.taoistwar.test.jdom.JdbcInfo.java

package com.taoistwar.test.jdom;

public class JdbcInfo {
    private String driverClassName;
    private String url;
    private String username;
    private String password;

    public JdbcInfo() {
        super();
    }

    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;
    }

}

 

com.taoistwar.test.jdom.ReadXML

package com.taoistwar.test.jdom;

public class ReadXML {
    private String u = "tao";
    public void p(String str) {
        System.out.println(str);
        System.out.println(u);
    }
   
}

 

 

输出XML文件

com.taoistwar.test.jdom.XmlWriter

package com.taoistwar.test.jdom;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

public class XmlWriter {
    public static void main(String[] args) throws FileNotFoundException, IOException {
        Element rootElt = new Element("selects");
        Element selElt = new Element("select");
        Element idElt = new Element("id");
        idElt.addContent("id1");
        Element valueElt = new Element("name");
        valueElt.addContent("name1");
        selElt.addContent(idElt);
        selElt.addContent(valueElt);
        rootElt.addContent(selElt);
        Document doc = new Document(rootElt);
        XMLOutputter out = new XMLOutputter();
        out.setFormat(Format.getCompactFormat().setEncoding("GBK"));;
        out.output(doc, new FileOutputStream("c:/t.xml"));
    }
}