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

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1. import java.util.List;  
2. import org.apache.commons.configuration.Configuration;  
3. import org.apache.commons.configuration.XMLConfiguration;  
4. public class XmlConfigurationExample {  
5.  public static void main(String[] args) throws Exception {  
6.   String resource = "com/discursive/jccook/configuration/global.xml";  
7.   Configuration config = new XMLConfiguration(resource);  
8.   //只有new一个XMLConfiguration的实例就可以了.  
9.   List startCriteria = config.getList("start-criteria.criteria");  
10.   int horsepower = config.getInt("horsepower");  
11.   System.out.println( "Start Criteria: " + startCriteria );  
12.   System.out.println(horsepower);  
13.  }  
14. }  

global.xml:

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1. <?xml version="1.0" encoding="ISO-8859-1" ?>  
2. <engine-config>  
3.  <start-criteria>  
4.   <criteria>  
5.    Temperature Above -10 Celsius  
6.   </criteria>  
7.   <criteria>  
8.    Fuel tank is not empty  
9.   </criteria>  
10.  </start-criteria>  
11.  <volume>4 Liters</volume>  
12.  <horsepower>42</horsepower>  
13. </engine-config>  

2.读取properties文件

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1. import org.apache.commons.configuration.Configuration;  
2. import org.apache.commons.configuration.PropertiesConfiguration;  
3. public class PropertiesConfigurationExample {  
4.  public static void main(String[] args) throws Exception  {  
5.   Configuration config = new PropertiesConfiguration(   
6. "com/discursive/jccook/configuration/global.properties" );  
7.     
8.   System.out.println( "Speed: " + config.getFloat("speed"));  
9.   System.out.println( "Names: " + config.getString("name"));  
10.   }  
11. }  

global.properties:

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1. threads.maximum=50  
2. threads.minimum=20  
3. timeout=15.52  
4. interactive=true  
5. color=red  
6. speed=50  
7. name=Default User  
8. email=default@email.com  
9. 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

view plain print ?

1. import java.net.URL;  
2. import java.util.List;  
3. import org.apache.commons.configuration.Configuration;  
4. import org.apache.commons.configuration.ConfigurationFactory;  
5. public class PropertiesXmlConfigurationExample {  
6.  public static void main(String[] args) throws Exception {  
7.   PropertiesXmlConfigurationExample example = new PropertiesXmlConfigurationExample();  
8.   ConfigurationFactory factory = new ConfigurationFactory();  
9.   URL configURL = example.getClass().getResource("additional-xml-configuration.xml");  
10.   factory.setConfigurationURL( configURL );  
11.     
12.   Configuration config = factory.getConfiguration();  
13.     
14.   List startCriteria = config.getList("start-criteria.criteria");  
15.   System.out.println( "Start Criteria: " + startCriteria );  
16.     
17.   int horsepower = config.getInt("horsepower");  
18.   System.out.println( "Horsepower: " + horsepower );  
19.  }  
20. }  

additional-xml-configuration.xml:

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1. <?xml version="1.0" encoding="ISO-8859-1" ?>  
2. <configuration>  
3.   <properties fileName="global.properties"/>  
4.   <xml fileName="global.xml"/>  
5. </configuration>  
6.    

或者采用另外一种方法:  用到了:CompositeConfiguration,手动加上两个配置文件

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1. import org.apache.commons.configuration.CompositeConfiguration;  
2. import org.apache.commons.configuration.ConfigurationException;  
3. import org.apache.commons.configuration.PropertiesConfiguration;  
4. import org.apache.commons.configuration.XMLConfiguration;  
5. public class Test {  
6.  /** 
7.   * @param args 
8.   * @throws ConfigurationException  
9.   */  
10.  public static void main(String[] args) throws ConfigurationException {  
11.   // TODO Auto-generated method stub  
12.   CompositeConfiguration config = new CompositeConfiguration();  
13.   config.addConfiguration(new PropertiesConfiguration(   
14. "com/discursive/jccook/configuration/global.properties" ));  
15.   config.addConfiguration( new XMLConfiguration  
16. ("com/discursive/jccook/configuration/global.xml"));  
17.   List startCriteria = config.getList("start-criteria.criteria");  
18.   int horsepower = config.getInt("horsepower");  
19.   System.out.println( "Start Criteria: " + startCriteria );  
20.   System.out.println(horsepower);  
21.     
22.   System.out.println( "Speed: " + config.getFloat("speed"));  
23.   System.out.println( "Names: " + config.getString("name"));  
24.  }  
25. }