In Java dynamically add string with properties file message?

Question

I am able to read the message from properties file where i added all messages with key/value pair

message.template.success.equipment.create = Equipment template created successfully
message.template.success.equipment.create.termination = Termination template created successfully
message.template.success.equipment.update = Equipment template updated successfully
message.template.success.termination.update = Termination template updated successfully

for reading message from the properties file i have create a class with following code

public class PropertyReader {

    private static PropertyReader instance = null;
    private ResourceBundle bundleResource;
    private ResourceBundle bundleResourceMenu;
    private ResourceBundle bundleResourceMessage;
    private static final Logger log = Logger.getLogger(PropertyReader.class);

    private PropertyReader() {}

    private PropertyReader(Locale locale) {
        log.info("Property Reader loading files with locale : "+locale.getLanguage());
        bundleResourceMenu = ResourceBundle.getBundle("bsm-portal-menu",locale);
        bundleResource = ResourceBundle.getBundle("bsmResource",locale);
        bundleResourceMessage = ResourceBundle.getBundle("bsm-portal-message",locale);
        log.info("**** BundleResourceMessage *****");

    }

    public static synchronized PropertyReader getInstance(Locale locale) {
        if (instance == null)
            instance = new PropertyReader(locale);
        return instance;
    }


    public String getBundleResource(String propKey) {
        return this.bundleResource.getString(propKey);
    }

    public String getBundleResourceMenu(String propKey) {
        return this.bundleResourceMenu.getString(propKey);
    }

    public String getBundleResourceMessage(String propKey) {
        return this.bundleResourceMessage.getString(propKey);
    }


}

Upto this everything fine.

Now i have want to make these type of message dynamic

 message = "Entities " + appenMessage.toString() + " are already added in another association";

here appenMessage variable have a dynamically generated String value which i have to append with message.It is possible to incorporate such kind with properties file ?

Answer 1

Check out this tutorial about Compound Messages:

Personally, I tend to do it with simple

 bundle.getString("key").replace("{0}", firstParam);

Answer 2

The java.text.MessageFormat.format( pattern , argument… ) function is designed just for this purpose.

In the properties file:

message.template.entities.associated = Entities {0} are already added in another association

In your code:

MessageFormat.format(getBundleResourceMessage("message.template.entities.associated"), appenMessage)

This will cause appenMessage.toString() to be substituted for the {0} placeholder. The MessageFormat class also supports fancier variants of placeholders to support issues that you will encounter in internationalization, such as pluralization and date formatting.