实现时主要使用Commons-Configuration.jar包，还需要commons-lang,disgestor,beanutils,collections等，

package propFile;

import java.net.URL;

import java.util.List;

import org.apache.commons.configuration.Configuration;

import org.apache.commons.configuration.ConfigurationException;

import org.apache.commons.configuration.ConfigurationFactory;

import org.apache.commons.configuration.PropertiesConfiguration;

import org.apache.commons.configuration.reloading.FileChangedReloadingStrategy;

/**

 * 修改 properties 文件时，每次都要重启应用程序， Commons-Configuration 调用 getXxxx 方法获取到的内容都是

 * properties 文件中最新的，无需重启应用

 *

 * @author zhaigx

 * @DATA 2011-5-27

 */

public class PropertiesUtil {

 static String propertiesFile = "config/config.properties";

 static PropertiesConfiguration propConfig;

 static Configuration multiConfig;

 static boolean isReload = true;

 private PropertiesUtil() {

 }

 private static void reloadPropFile() {

  if (isReload) {

   try {

    propConfig = new PropertiesConfiguration(propertiesFile);

    propConfig

      .setReloadingStrategy(new FileChangedReloadingStrategy());

   } catch (ConfigurationException e) {

    // TODO Auto-generated catch block

    e.printStackTrace();

   }

  }

  isReload = false;

 }

 public static Object getValueFromPropFile(String key) {

  reloadPropFile();

  return propConfig.getProperty(key);

 }

 public static String[] getArrFromPropFile(String key){

  reloadPropFile();

  return propConfig.getStringArray(key);

 }

 

 private static void reloadMultiConfigFile() {

  ConfigurationFactory factory = new ConfigurationFactory();

  String file = "config/xml-prop.xml";

  System.out.println("multiConfigFile==> " + file);

  factory.setConfigurationFileName(file);

  try {

   multiConfig = factory.getConfiguration();

  } catch (ConfigurationException e) {

   // TODO Auto-generated catch block

   e.printStackTrace();

  }

 }

 public static Object getValueFromMultiFile(String key) {

  reloadMultiConfigFile();

  return multiConfig.getProperty(key);

 }

}

测试类：

package propFile;

import java.util.List;

import propFile.PropertiesUtil;

public class PropertiesUtilTest {

 /**

  *

  * @author zhaigx

  * @param args

  * @DATE 2011-5-27

  */

 public static void main(String[] args) {

//  for (int i = 0; i < 1000; i++) {

//   String valueString = (String) PropertiesUtil

//     .getValueFromPropFile("name");

//   System.out.println(valueString);

//   try {

//    Thread.sleep(1000);

//   } catch (InterruptedException e) {

//    // TODO Auto-generated catch block'

//    e.printStackTrace();

//   }

//  }

  

  String[] country=(String[])PropertiesUtil.getArrFromPropFile("country");

  for (int i = 0; i < country.length; i++) {

   System.out.println(country[i]);

  }

  

  List list = (List) PropertiesUtil

    .getValueFromMultiFile("start-criteria.criteria");

  for (int i = 0; i < list.size(); i++) {

   String value = list.get(i).toString();

   System.out.println(value);

  }

  for (int i = 0; i < 1000; i++) {

   int intValue = Integer.parseInt(PropertiesUtil

     .getValueFromMultiFile("horsepower").toString());

   System.out.println(intValue);

   try {

    Thread.sleep(1000);

   } catch (InterruptedException e) {

    // TODO Auto-generated catch block

    e.printStackTrace();

   }

  }

 }

}

 

config目录下的配置文件：

config.properties:

a=1

b=3

name=to

country = USA,China,English

 

xml-prop.xml:

<?xml version="1.0" encoding="gbk" ?>

<configuration>

 <properties fileName="global.properties"></properties>

 <xml fileName="global.xml"></xml>

</configuration>

 

global.properties:

threads.maximum=50

threads.minimum=20

timeout=15.52

interactive=true

color=red

speed=50

name=Default User

region=Earth

 

global.xml:

<?xml version="1.0" encoding="gbk" ?>

<engine-config>

 <start-criteria>

  <criteria>

   Temperature Above -10 Celsius

  </criteria>

  <criteria>

   Fuel tank is not empty

  </criteria>

 </start-criteria>

 <volume>4 Liters</volume>

 <horsepower>77</horsepower>

</engine-config>