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 protected]

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 {

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"));

}

}