Load a configuration file

[Saumya Nair]

Hi All,


I am calling a java file (servlet) from my JSP... I need to load a configuration file on the servlet call.. How can I do it ??

I tried using new AppProperties(name,filename) , but the file does not load. I am using hibernate and mysql. Every time my servlet is being called it throws invalid URL exception for the above line..

Please help...


Regards,
Saumya

[John Dunn]

load you file in the init() method of your servlet so it gets done once, for the life of the servlet.

 
        Properties prop = new Properties();
        try
        {
          FileInputStream fins = new FileInputStream(< some propFileName> :wink: ;
 
          // Pass input stream and load the data from the properties file.
          prop.load(fins);
        }
        catch (Exception e)
        {
          //Handle your exceptions...          
        }
 
        //These are the "System Properties "
          Properties sys = System.getProperties();
          Enumeration enumsys = sys.propertyNames();
          while (enumsys.hasMoreElements())
          {
            String name = (String) enumsys.nextElement();
            String value = sys.getProperty(name);
            if ( (showConfig) && (value != null))
            {
              log("Sys Prop -> " + name + " : " + value);
            }
          }
 

        // Print all the properties to the log file as well.
          Enumeration enum = prop.propertyNames();
          while (enum.hasMoreElements())
          {
            String name = (String) enum.nextElement();
            String value = prop.getProperty(name);
            if (value != null)
            {
              log("Config -> " + name + " : " + value);
            }
          }
 

[Saumya Nair]

When i print the Property i get from the file, it does not print the ones with the empty tags.

i.e

<property name="hibernate.config" value="/hibernate.cfg.xml" />
<property name="log4j.config" value="config/log4j.xml" />


is there any way i can load this configuration file (cfg.xml) file on the server startup. I m using Tomcat.


Regards,
Saumya

[A Kumar]

Why dont you load the servlet class at the server startup using the listener tag in web.xml?

[Rahul Bhattacharjee]

Within a web app I use the following to load configuration file to a property object.

InputStream in = this.class.getClassLoader().getResourceAsStream("/WB-INF/myProp.properties");

OR,

InputStream in = servletContext.getClassLoader().getResourceAsStream("/WB-INF/myProp.properties");


Properties p = new Properties();
p.load(in);

My webapplication context name is "myApp" and the config file myProp.properties is there in the WEB-INF folder of the application.

[Rahul Bhattacharjee]

To take the configuration filename declaratively .you can set the name of the file as servlet init params.
And then load the file from the location to a properties object.