Jakarta commons configuration Study Notes

Jakarta commons configuration Study Notes

Keywords: Jakarta, commons, Configuration

Runtime Dependencies

Some components required for running:

• Commons beanutils
• Commons collections
• Commons Digester
• Commons Lang
• Commons Logging
• XML APIs or xerces

Dependency:

1. Core
   • Commons collections
   • Commons Lang
2. Configurationfactory
   • Commons Logging
   • Commons Digester
3. Databaseconfiguration
   • Commons Logging
4. Xmlconfiguration, hierarchicalxml+aion
   • XML APIs or xerces
5. Jndiconfiguration
   • Commons Logging
6. Configurationdynabean
   • Commons beanutils
   • Commons Logging

Use configurationfactory for configuration

Portal/
| --Src/
| --WEB-INF/
| ---- Config. xml
| ----Properties/
| ------ Usergui. Properties
| ----Classes/
| ------ Configurationfactorytest. Class

Configurationfactory provides two methods to specify the location of the configuration file:

• Setconfigurationurl (URL)
• Setconfigurationfilename (string)

Use the factory. setconfigurationurl (URL) method to specify the configuration file configurationfactory factory = new configurationfactory ();
URL url = new file ("WEB-INF/config. xml"). tourl ();
Factory. setconfigurationurl (URL );
Configuration Config = factory. getconfiguration ();
System. Out. println (config. getstring ("Colors. Background "));

In this case, the declaration of other configuration files in config. xml should be relative to the path of config. xml. <? XML version = "1.0" encoding = "ISO-8859-1"?>
<Configuration>
<PropertiesFilename = "properties/usergui. properties"/>
<! -- OrFilename = "./properties/usergui. properties"-->
</Configuration>

Use the factory. setconfigurationfilename (string) method to specify the configurationfactory factory = new configurationfactory ();
Factory. setconfigurationfilename ("WEB-INF/config. xml ");
Configuration Config = factory. getconfiguration ();
System. Out. println (config. getstring ("Colors. Background "));

In this case, the declaration of other configuration files in config. xml should be relative to the root directory path of the project: <? XML version = "1.0" encoding = "ISO-8859-1"?>
<Configuration>
<PropertiesFilename = "WEB-INF/properties/usergui. properties"/>
</Configuration>

! Note: If the path of the configuration file is incorrect, the following two exceptions will occur:

• org. Apache. commons. configuration. configurationfactory. getconfiguration (configurationfactory. Java: 135)-exception caught opening stream to URL indicates that config. xml cannot be found
• Org. apache. commons. digester. digester. endelement (digester. java: 1069)-end event threw exception Java. lang. reflect. invocationtargetexception indicates config cannot be found. other configuration files declared in XML