jdom解析xml示例

要解析的xml 代码

<!---->xml version="1.0" encoding="GBK"?>
<sys_para>
  <para>
    <item code="hostname"        value="192.168.2.18"       description="LDAP服务器IP"/>
    <item code="port"            value="389"                description="服务器端口"/>
    <item code="admin"           value="培训a"                description="管理员帐号"/>
    <item code="pwd"             value="password"           description="密码"/>
    <item code="basedn"          value="eweb"               description="组织名(基准DN)"/>
    <item code="adminuser"       value="admin"              description="系统管理员用户"/>
    <item code="adminpwd"        value="200200"             description="系统管理员密码"/>
    <item code="defaultgroupid"  value="47"                 description="默认组id(无任何权限)"/>
  para>
sys_para>

 

java 代码

package ldap;

import java.io.*;
import java.util.*;
import org.jdom.*;
import org.jdom.input.SAXBuilder;

public class UMParas
{

    private static HashMap prop;
    private static long lastLoadTime;
    private static long interval = 0x186a0L;  //refresh per 100 second
//    static Class class$0; /* synthetic field */

    public UMParas()
    {
    }
    //input an para and return the result
    public static synchronized String getPara(String paras)
        throws IllegalArgumentException
    {
        if(paras == null || paras.trim().length() == 0)
            throw new IllegalArgumentException("Parameter's value invalid.");
        long currentTime = System.currentTimeMillis();
        if(prop == null || currentTime - lastLoadTime > interval)
            reloadDom();
        Object obj = prop.get(paras);
        if(obj != null)
            return (String)obj;
        else
            return null;
    }
    //load the xml file
    private static synchronized void reloadDom()
    {
        if(prop == null)
            prop = new HashMap();
        SAXBuilder builder = new SAXBuilder();
        Document read_doc = null;
        try
        {
            read_doc = builder.build(UMParas.class.getResource("ldapconfig.xml"));
        }
        catch(FileNotFoundException e)
        {
            e.printStackTrace();
        }
        catch(JDOMException e)
        {
            e.printStackTrace();
        }
        catch(IOException e)
        {
            e.printStackTrace();
        }
        Element rootElement = read_doc.getRootElement();
        List list = rootElement.getChildren("para");
        for(Iterator i = list.iterator(); i.hasNext();)
        {
            Element current = (Element)i.next();
            List item = current.getChildren("item");
            Attribute code;
            Attribute value;
            for(Iterator j = item.iterator(); j.hasNext(); prop.put(code.getValue(), value.getValue()))
            {
                Element init = (Element)j.next();
                code = init.getAttribute("code");
                value = init.getAttribute("value");
            }

        }

        System.out.println("解析ldapconfig.xml成功");
        lastLoadTime = System.currentTimeMillis();
    }

    public static void main(String args[])
    {
        System.out.println(getPara("hostname"));
    }

}