JAVA编码（19）——系统配置监听器来读取配置信息

web.xml中添加监听器：

<listener>
		<listener-class>
			com.sinosoft.mm.listener.LoadLocationPropertiesListener
		</listener-class>
</listener>

　　

监听方法：监听src下的配置信息：


package com.sinosoft.mm.listener;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.apache.log4j.Logger;

import sinosoftoa.presentation.workflow.LoadLocationProperties;

public class LoadLocationPropertiesListener implements ServletContextListener {
	private final Logger logger = Logger.getLogger(LoadLocationPropertiesListener.class);

	public void contextDestroyed(ServletContextEvent event) {
		// TODO Auto-generated method stub
		try {
		} catch (Exception e) {
			System.out.println(" 监听器销毁失败 exception:"+e.toString());
		}
	}

	public void contextInitialized(ServletContextEvent event) {
		try {
			// load location.properties
			LoadLocationProperties.setProperties("/location.properties");
			// load log4j.properties
			LoadLocationProperties.setProperties("/log4j.properties");
		} catch (Exception e) {
			logger.error(e.getMessage(),e);
			System.out.println(" 监听器初始化 exception:"+e.toString());
		}
	}
}

　　

将读取的配置信息装入到map中：

package sinosoftoa.presentation.workflow;

import java.io.IOException;
import java.io.InputStream;
import java.util.Hashtable;
import java.util.Map;
import java.util.Properties;

import org.apache.log4j.Logger;


public class LoadLocationProperties {
	private static final Logger logger = Logger.getLogger(LoadLocationProperties.class);
	
	//Properties  cache
	public static Map<String, Properties> pMap = new Hashtable<String, Properties>();
	
	public static void setProperties(String name){
		Properties p = new Properties();
		InputStream in = null;
		in = LoadLocationProperties.class.getClassLoader().getResourceAsStream("location.properties");
		try {
			p.load(in);
		} catch (IOException e) {
			System.out.println("加载location.properties失败:"+e.toString());
		}finally{
			try {
				if (in!=null) {
					in.close();
				}
			} catch (IOException e) {
				System.out.println(""+e.toString());
			}
		}
		logger.info("Load to properties cache :" + name);
		pMap.put(name, p);
	}
	
	//Get properties by properties path
	public static Properties getProperties(String name){
		return pMap.get(name);
	}
	
	//Get properties value by properties path & key
	public static String getPropertiesValue(String name,String key){
		if (pMap.get(name)==null) {
			return null;
		}
		return pMap.get(name).getProperty(key);
	}
}

　　

项目中如何读取配置信息：

String voucherFilePath = LoadLocationProperties.getPropertiesValue("/location.properties", "voucherFilePath");