自己写的一个SystemConfig，备份下-CSDN博客

本文介绍了一个用于读取系统配置文件systemConfig.xml的Java类SystemConfig。该类支持简单的XML配置读取，并采用缓存机制提高读取效率。

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java 代码

package org.wanwei.test.xmlreader;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.log4j.Logger;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;
/**
* 读取系统配置文件systemConfig.xml.
* 只支持读取简单的XML配置:
* eg:<assocication>
* <bj_comp_eff_date>2007-06-20</bj_comp_eff_date>
* </assocication>
* 不支持带属性的XML读取:
* <Controler type="1" factoryClass="com.elinksoft.bsp.action.ActionBeanFactory" />
* @author wanwei
* @since 2007-7-4
*/
public class SystemConfig
{
private static final Logger logger = Logger.getLogger(SystemConfig.class);
private static final String DEFAULT_SPLIT = "/";
private static final Map cacheMap = new HashMap();
private static boolean initialize = false;
/**
* 从systemConfig.xml文件中读取相应配置
* note:第一次读取需要初始化,以后都从缓存中读取.
* @param configPath eg:/config/assocication/bj_comp_eff_date
* @return String not null or empty
* @throws Exception "unmatching configPath" will throw if no matching text found
*/
public static String getConfigTextValue(String configPath) throws Exception
{
if( !initialize )
{
initialize();
}
String value = (String) cacheMap.get(configPath);
if( value == null || value.length() == 0 )
{
getConfigTextValue(configPath, true);
}
return value;
}
/**
* 从systemConfig.xml文件中读取相应配置
* @param configPath eg:/config/assocication/bj_comp_eff_date
* @param reinitialize if true ,system will read the xml files again.
* @return String not null or empty
* @throws Exception Exception "unmatching configPath" will throw if no matching text found
*/
public static final String getConfigTextValue(String configPath, boolean reinitialize)
throws Exception
{
if( reinitialize )
{
initialize();
}
String value = (String) cacheMap.get(configPath);
if( value == null || value.length() == 0 )
throw new Exception("unmatching configPath:" + configPath);
return value;
}
/**
* read xml files and cache them.
* @throws Exception
*/
private static void initialize() throws Exception
{
SAXBuilder sb = new SAXBuilder();
InputStream is = ClassLoader.getSystemResourceAsStream("org/wanwei/test/xmlreader/systemconfig.xml");
Document doc = sb.build(is); // 构造文档对象
Element root = doc.getRootElement(); // 获取根元素
recursiveReadElement(root, "");// 递归读取xml元素
initialize = true;
// logger the cacheMap.
if( logger.isInfoEnabled() )
logger.info("initialize system config:\n"+mapToString(cacheMap));
//System.out.println(mapToString(cacheMap));
}
private static void recursiveReadElement(Element root, String parentName)
{
List list = root.getChildren();
String text = root.getTextTrim();
String url = parentName + DEFAULT_SPLIT + root.getName();
if( text != null && text.length() > 0 )
{
cacheMap.put(url, text);
}
if( list != null && list.size() >= 0 )
{
for( int i = 0; i < list.size(); i++ )
{
if( list.get(i) instanceof Element )
{
recursiveReadElement((Element) list.get(i), url);
}
}
}
}
private static String mapToString(Map map)
{
StringBuffer mapBuffer = new StringBuffer();
if( map == null || map.isEmpty() )
return "";
Set KeySet = map.keySet();
Iterator iterator = KeySet.iterator();
while( iterator.hasNext() )
{
String key = (String) iterator.next();
String value = (String) map.get(key);
mapBuffer.append(key + "=" + value);
if( iterator.hasNext() )
mapBuffer.append(";\n");
}
return mapBuffer.toString();
}
public static void main(String[] arg0)
{
try
{
System.out.println(SystemConfig.getConfigTextValue("/config/assocication/bj_comp_eff_date"));
System.out.println("OK");
} catch( Exception e )
{
e.printStackTrace();
System.out.println("ERROR");
}
}
}