WEB application reads configuration files
Abstract: WEB application reads configuration files
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Suppose you Proxool.properties document attributes in the database configuration information:
Jdbc-0.proxool.alias = Access
Jdbc-0.proxool.driver-class = sun.jdbc.odbc.JdbcOdbcDriver
Jdbc-0.proxool.driver-url = jdbc: odbc: cwb
Jdbc-0.proxool.maximum-connection-count = 20
Jdbc-0.proxool.prototype-count = 4
Jdbc-0.proxool.house-keeping-test-sql = select CURRENT_DATE
Jdbc-0.proxool.verbose = true
Jdbc-0.proxool.statistics = 10s, 1m, 1d
Jdbc-0.proxool.statistics-log-level = ERROR
You attribute this document will be placed on your application's WEB web-info/classes directory, or in the bean category in the document to visit the traditional methods of document attributes Wuguo so:
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Package examples; import java.io. *; import java.util .*; public class EnvironmentConfig (static EnvironmentConfig ec; / / Create Object ec private static Hashtable register = new Hashtable ();// static object initialized [in other Before object] private EnvironmentConfig () (super ();) / ** * EnvironmentConfig made an example of * @ return ec * / public static EnvironmentConfig getInstance () (if (ec == null) ec = new EnvironmentConfig (); / / create EnvironmentConfig target return ec; / / return EnvironmentConfig target) / ** * * @ read configuration files * @ param java.lang.String fileName return Properties * / public Properties getProperties (String fileName) (/ / transmission configuration file path InputStream is = null; / / definition of input streams is Properties p = null; try (p = (Properties) register.get (fileName); / / fileName stored in a HashTable / ** * If it is empty Try entered into documents * / if (p == null) (try (is = new FileInputStream (fileName); / / create input streams) catch (Exception e) (if (fileName.startsWith ("/")) / / use getResourceAsStream () method used to locate and open external documents. EnvironmentConfig.class.getResourceAsStream is = (fileName); else is EnvironmentConfig.class.getResourceAsStream ("/"+ = fileName);) p = new Properties (); p.load (is); / / load the input flow register. put (fileName, p) / / stored in its cache is.close ();// HashTable closed input flow)) catch (Exception e) (e.printStackTrace (System.out);) return p; / / Properties returned to the object) / ** * insert description. * Create Date: (2003-8-10 12:30:09) * @ param fileName java.lang.String * @ param strKey java.lang.String * / public String getPropertyValue (String fileName, String strKey) (Properties p = getProperties (fileName); try (return (String) p.getProperty (strKey);) catch (Exception e) (e.printStackTrace (System.out);) return null;))
Below are the jsp test: testpro.jsp
<% @ Page contentType = "text / html; GBK charset ="%>
<% @ Page import = "examples.EnvironmentConfig"%>
<% @ Page import = "java.util .*"%>
Test configuration file
<%
EnvironmentConfig ec = EnvironmentConfig.getInstance ();
/ / Properties p = ec.getProperties ( "/ Proxool.properties");
String s = ec.getPropertyValue ( "/ Proxool.properties", "jdbc-0.proxool.driver-class");
Out.println ( "jdbc-0.proxool.driver-class =" + s);
%>
The result:
Test configuration file
Jdbc-0.proxool.driver-class = sun.jdbc.odbc.JdbcOdbcDriver
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Tags: Configuration