使用Digester解析XML文件和JAVA对象的映射

 

package  cn.hxex.exam.config;

import  java.util.Hashtable;

import  cn.hxex.exam.exception.ExamException;

public   class  ExamConfig  ... {
   private Hashtable daos;
   public ExamConfig()...{
       daos=new Hashtable();
   }
   public void addDao(DAOConfig bean)...{
       daos.put(bean.getId(), bean);
   }
   
   public DAOConfig getDAOConfig(String name)...{
       DAOConfig config=(DAOConfig)daos.get(name);
       if(config==null)...{
           throw new ExamException("couldn't find the bean:"+name);
       }
       return config;
   }
}

package  cn.hxex.exam.config;

import  java.io.InputStream;

import  org.apache.commons.digester.Digester;

public   class  ExamConfigUtil  ... {
   public static final String DEFAULT_CONFIG_FILE="ExamConfig.xml";
   public static final ExamConfig MESSAGE_CONFIG;
   
   static...{
       Digester digester=new Digester();
       digester.setValidating(false);
       
       //初始化根配置对象
       digester.addObjectCreate("config", "cn.hxex.exam.config.Examconfig");
       digester.addSetProperties("config");
       
       //初始化DAOConfig对象
       digester.addObjectCreate("config/daos/dao", "cn.hxex.exam.config.DAOConfig");
       digester.addSetProperties("config/daos/dao");
       digester.addSetNext("config/dao/dao", "addDao","cn.hxex.exam.config.DAOConfig");
       
       //读取配置文件
       ClassLoader classLoader=Thread.currentThread().getContextClassLoader();
       InputStream in=classLoader.getResourceAsStream(DEFAULT_CONFIG_FILE);
       ExamConfig config=null;
       try ...{
          if(in!=null)...{
              config=(ExamConfig)digester.parse(in);
          }
        } catch (Exception e) ...{
          e.printStackTrace();
       }
        MESSAGE_CONFIG=config;    
   }
   
   public static ExamConfig getConfig()...{
       return ExamConfigUtil.MESSAGE_CONFIG;
   }
   
   public static DAOConfig getDAOConfig(String name)...{
       return MESSAGE_CONFIG.getDAOConfig(name);
   }
   
}

< config >
     < daos >
         < dao  id ="UserDAO"  type ="cn.hxex.exam.dao.hibernate.UserDAOHibernate"   />
         < dao  id ="TeacherDAO"  type ="cn.hxex.exam.dao.hibernate.TeacherDAOHibernate"   />
         < dao  id ="TestPaperDAO"  type ="cn.hxex.exam.dao.hibernate.TestPaperDAOHibernate"   />
         < dao  id ="RoleDAO"  type ="cn.hxex.exam.dao.hibernate.RoleDAOHibernate"   />
         < dao  id ="ClassesDAO"  type ="cn.hxex.exam.dao.hibernate.ClassesDAOHibernate"   />
         < dao  id ="StudentDAO"  type ="cn.hxex.exam.dao.hibernate.StudentDAOHibernate"   />
         < dao  id ="SelectQuestionDAO"  type ="cn.hxex.exam.dao.hibernate.SelectQuestionDAOHibernate"   />
         < dao  id ="YesNoQuestionDAO"  type ="cn.hxex.exam.dao.hibernate.YesNoQuestionDAOHibernate"   />
     </ daos >
     < cache  type ="cn.hxex.exam.cache.ehcache.EHCache" >
         < property  name ="cachename"  value ="cache"   />
     </ cache >
     < sysconfig >
         < property  name ="superuser"  value ="super,test"   />
     </ sysconfig >
</ config >