java中org.apache.commons.digester类用法

king71

　　xml文件内容：

<?xml version="1.0" encoding="UTF-8"?>  
<channels>  
<channel switchTime="20080101000101" k="1.07" n="6" s="55" channelId="0404" channelName="xxxx.xxxx.xxx.cn"/>  
<channel switchTime="20080301010101" k="1.07" n="6" s="55" channelId="0405" channelName="xxxx.xxxx.xxx.cn"/>  
<channel switchTime="20080301010101" k="1.07" n="6" s="55" channelId="0406" channelName="xxxx.xxxx.xxx.cn"/>  
<channel switchTime="20080301010101" k="1.07" n="6" s="55" channelId="0407" channelName="xxxx.xxxx.xxx.cn"/>  
<channel switchTime="20080301010101" k="1.07" n="6" s="55" channelId="0408" channelName="xxxx.xxxx.xxx.cn"/>  
<channel switchTime="20080301010101" k="1.07" n="6" s="55" channelId="0409" channelName="xxxx.xxxx.xxx.cn"/>  
<channel switchTime="20080301010101" k="1.07" n="6" s="55" channelId="0433" channelName="xxxx.xxxx.xxx.cn"/>  
<channel switchTime="20080301010101" k="1.07" n="6" s="55" channelId="0434" channelName="xxxx.xxxx.xxx.cn"/>  
<channel switchTime="20080301010101" k="1.07" n="6" s="55" channelId="0437" channelName="xxxx.xxxx.xxx.cn"/>  
<channel switchTime="20080301010101" k="1.07" n="6" s="55" channelId="0435" channelName="xxxx.xxxx.xxx.cn"/>  
<channel switchTime="20080301010101" k="1.07" n="6" s="55" channelId="0438" channelName="xxxx.xxxx.xxx.cn"/>  
<channel switchTime="20080301010101" k="1.07" n="6" s="55" channelId="0439" channelName="xxxx.xxxx.xxx.cn"/>  
<channel switchTime="20080301010101" k="1.07" n="6" s="55" channelId="0440" channelName="xxxx.xxxx.xxx.cn"/>  
</channels>  


import org.apache.commons.digester.Digester;           
Digester digester = new Digester();   
//此方法作用是是否对XML文档进行DTD验证   
digester.setValidating(false);   
//addObjectCreate的作用是：当遇见channels元素的时候，产生一个java.util.ArrayList对象   
digester.addObjectCreate("channels", "java.util.ArrayList");   
//addSetProperties作用是：对channels元素所含的属性赋值(即下面channels/channel中的对象值)   
digester.addSetProperties("channels");   
//当遇见channels/channel元素的时候，产生一个com.chinacache.config.model.ChannelSwitch对象   
digester.addObjectCreate("channels/channel","com.chinacache.config.model.ChannelSwitch");   
//对channels/channel元素所含的属性赋值给ChannelSwitch对象      
digester.addSetProperties("channels/channel");   
//当再一次遇见 channels下的channel元素的时候，调用ArrayList类的add()方法,add：com.chinacache.config.model.ChannelSwitch对象           
digester.addSetNext("channels/channel", "add","com.chinacache.config.model.ChannelSwitch");  


　　调用：

try {   
List channelList = (List) digester   
.parse(ChannelSwitchInfoImpl.class  
.getResourceAsStream(Constants.PATH_CHANNEL_SWITCH));   
for (int i = 0; i < channelList.size(); i++) {   
ChannelSwitch channelSwitch = (ChannelSwitch) channelList   
.get(i);   
this.channelSwitchs.put(channelSwitch.getChannelName(),   
channelSwitch);   
this.channelSwitchsSavedById.put(channelSwitch.getChannelId(),   
channelSwitch);   
}   

} catch (IOException e) {   
logger.error("load channelswitch.xml error.", e);   
} catch (SAXException e) {   
logger.error("load channelswitch.xml error.", e);   
}