java非web应用修改 properties/xml配置文件后，无需重启应用即可生效---自动加载

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>