common-configuration读取xml,properties文件

  我们在实际的开发设计中,通常要读各种各样的配置文件,十分烦琐.然而commons-configuration-1.0.jar为我们提供了非常方便的操作方式实例如下:

1.读取XML文件中内容

import java.util.List;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.XMLConfiguration;

public class XmlConfigurationExample {

public static void main(String[] args) throws Exception {
String resource = "com/discursive/jccook/configuration/global.xml";
Configuration config = new XMLConfiguration(resource);
//只有new一个XMLConfiguration的实例就可以了.
List startCriteria = config.getList("start-criteria.criteria");
int horsepower = config.getInt("horsepower");
System.out.println( "Start Criteria: " + startCriteria );
System.out.println(horsepower);
}
}

 

global.xml

<?xml version="1.0" encoding="ISO-8859-1" ?>

<engine-config>
<start-criteria>
<criteria>
Temperature Above -10 Celsius
</criteria>
<criteria>
Fuel tank is not empty
</criteria>
</start-criteria>
<volume>4 Liters</volume>
<horsepower>42</horsepower>
</engine-config>

 

2.读取properties文件

import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.PropertiesConfiguration;

public class PropertiesConfigurationExample {

public static void main(String[] args) throws Exception {
Configuration config = new PropertiesConfiguration(

"com/discursive/jccook/configuration/global.properties" );

System.out.println( "Speed: " + config.getFloat("speed"));
System.out.println( "Names: " + config.getString("name"));
}
}

 

global.properties

threads.maximum=50
threads.minimum=20
timeout=15.52
interactive=true
color=red
speed=50
name=Default User
email=[e-mail]
region=Earth

 

3.当有多个配置文件时,就利用ConfigurationFactory对象来访问多个不同的配置资源

import java.net.URL;
import java.util.List;

import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationFactory;

public class PropertiesXmlConfigurationExample {

public static void main(String[] args) throws Exception {
PropertiesXmlConfigurationExample example = new PropertiesXmlConfigurationExample();

ConfigurationFactory factory = new ConfigurationFactory();
URL configURL = example.getClass().getResource("additional-xml-configuration.xml");
factory.setConfigurationURL( configURL );

Configuration config = factory.getConfiguration();

List startCriteria = config.getList("start-criteria.criteria");
System.out.println( "Start Criteria: " + startCriteria );

int horsepower = config.getInt("horsepower");
System.out.println( "Horsepower: " + horsepower );
}
}

 

additional-xml-configuration.xml

<?xml version="1.0" encoding="ISO-8859-1" ?>
<configuration>
<properties fileName="global.properties"/>
<xml fileName="global.xml"/>
</configuration>

 

4.CompositeConfiguration,手动加上两个配置文件

import org.apache.commons.configuration.CompositeConfiguration;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.configuration.XMLConfiguration;

public class Test {

/**
* @param args
* @throws ConfigurationException
*/
public static void main(String[] args) throws ConfigurationException {
// TODO Auto-generated method stub
CompositeConfiguration config = new CompositeConfiguration();
config.addConfiguration(new PropertiesConfiguration(

"com/discursive/jccook/configuration/global.properties" ));
config.addConfiguration( new XMLConfiguration

("com/discursive/jccook/configuration/global.xml"));
List startCriteria = config.getList("start-criteria.criteria");
int horsepower = config.getInt("horsepower");
System.out.println( "Start Criteria: " + startCriteria );
System.out.println(horsepower);

System.out.println( "Speed: " + config.getFloat("speed"));
System.out.println( "Names: " + config.getString("name"));

}

}