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示例：

属性文件：beans.properties

articleDao=cn.com.leadfar.cms.backend.dao.impl.ArticleDaoImpl

channelDao=cn.com.leadfar.cms.backend.dao.impl.ChannelDaoImpl

使用此属性时类的配置如下：

PropertiesBeanFactory.java

package cn.com.leadfar.cms.utils;

import java.io.IOException;

import java.util.Properties;

import cn.com.leadfar.cms.backend.dao.ArticleDao;

import cn.com.leadfar.cms.backend.dao.ChannelDao;

public class PropertiesBeanFactory implements BeanFactory {

Properties props = new Properties();

public PropertiesBeanFactory(){

//读取配置文件，得到具体DAO的实现类名

try {

props.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("beans.properties"));

} catch (IOException e) {

e.printStackTrace();

}

}

public ArticleDao getArticleDao() {

String className = props.getProperty("articleDao");

try {

Class clz = Class.forName(className);

return (ArticleDao)clz.newInstance();

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (InstantiationException e) {

e.printStackTrace();

} catch (IllegalAccessException e) {

e.printStackTrace();

}

return null;

}

public ChannelDao getChannelDao() {

String className = props.getProperty("channelDao");

try {

Class clz = Class.forName(className);

return (ChannelDao)clz.newInstance();

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (InstantiationException e) {

e.printStackTrace();

} catch (IllegalAccessException e) {

e.printStackTrace();

}

return null;

}

}

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