使用common-configuration读取xml,properties文件

 

转帖出处：http://blog.csdn.net/pengchua/archive/2007/12/21/1957069.aspx

http://commons.apache.org/configuration/apidocs/index.html 
Commons Configuration provides a generic configuration interface which enables a Java application to

read configuration data from a variety of sources.

PropertiesConfiguration Loads configuration values from a properties file. 
XMLConfiguration Takes values from an XML document. 
INIConfiguration Loads the values from a .ini file as used by Windows. 
PropertyListConfiguration Loads values from an OpenStep .plist file. XMLPropertyListConfiguration is

also available to read the XML variant used by Mac OS X. 
JNDIConfiguration Using a key in the JNDI tree, can retrieve values as configuration properties. 
BaseConfiguration An in-memory method of populating a Configuration object. 
HierarchicalConfiguration An in-memory Configuration object that is able to deal with complex

structured data. 
SystemConfiguration A configuration using the system properties 
ConfigurationConverter Takes a java.util.Properties or an

org.apache.commons.collections.ExtendedProperties and converts it to a Configuration object.

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=default@email.com
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

ConfigurationFactory可以组合多个配置资源。然后我们就可以像访问单个资源文件一样来访问他们中的属性。首

先，我们需要创建一个xml文件来告诉工厂哪些文件将要被加载。下面是一个例：
 <?xml version="1.0" encoding="ISO-8859-1" ?> 
<configuration>
  <properties fileName="usergui.properties"/>
</configuration>
ConfigurationFactory的定义文件是一个普通的xml文件.根元素是configuration.他饱含的子元素制定了需要装载

的配置资源.properties是元素之一,他用来包含属性文件

 

 

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>

 

或者采用另外一种方法:  用到了: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"));
 }
}