Spring-mvc – Dynamically generate a list of available languages in Spring MVC

dynamicinternationalizationlistspring-mvc

I have set up i18n in Spring MVC 3, and it is working correctly.
There are several files, each with its own language: messages_en.properties, messages_de.properties, etc.

In one of my JSPs, I need to show the users a combo with all available languages, and I would like this list to be dynamic i.e. generated on the fly from the existing language files in the server.

Is there any built-in method to generate this list? Or do I have to resort to check the folder where the language files reside and parse them?

Thanks!

Nacho

Best Answer

How about putting this into something that has access to the ReloadableResourceBundleMessageSource?

ReloadableResourceBundleMessageSource rrbms = getMessageSource();   
final String defaultMessage = "NOT FOUND";
List<Locale> availableLocales = new ArrayList<Locale>();
for (Locale locale : Locale.getAvailableLocales()) {
    String msg = rrbms.getMessage("test.code", null, defaultMessage, locale);
    if (!defaultMessage.equals(msg)) {
       availableLocales.add(locale);
    }
}

Just make sure each supported language supplies a test.code value and you're done.

Related Solutions

Java – @ModelAttribute in Spring MVC

@ModelAttribute refers to a property of the Model object (the M in MVC ;) so let's say we have a form with a form backing object that is called "Person" Then you can have Spring MVC supply this object to a Controller method by using the @ModelAttribute annotation:

public String processForm(@ModelAttribute("person") Person person){
    person.getStuff();
}

On the other hand the annotation is used to define objects which should be part of a Model. So if you want to have a Person object referenced in the Model you can use the following method:

@ModelAttribute("person")
public Person getPerson(){
    return new Person();
}

This annotated method will allow access to the Person object in your View, since it gets automatically added to the Models by Spring.

See "Using @ModelAttribute".

Java – Spring MVC ResourceBundleMessageSource XML configuration

Here is the solution:

package com.mypackage.core.src;

import java.io.File;
import java.util.ArrayList;

import javax.servlet.ServletContext;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.support.ReloadableResourceBundleMessageSource;

public class UnderDirectoryReloadableResourceBundleMessageSource extends ReloadableResourceBundleMessageSource {

    @Autowired
    ServletContext servletContext;

    public void setWorkingDirectory(String directoryPath) {
        File rootDir = new File( servletContext.getRealPath(directoryPath) );
        ArrayList<String> baseNames = new ArrayList<String>();
        iterateScanDirectoryAndAddBaseNames(baseNames, rootDir);
        setBasenames(baseNames.toArray(new String[baseNames.size()]));
    }

    private void iterateScanDirectoryAndAddBaseNames(ArrayList<String> baseNames, File directory) {
        File[] files = directory.listFiles();

        for (File file : files) {
            if (file.isDirectory()) {
                iterateScanDirectoryAndAddBaseNames(baseNames, file);
            } else {
                if (file.getName().endsWith(".properties")) {
                    String filePath = file.getAbsolutePath().replaceAll("\\\\", "/").replaceAll(".properties$", "");
                    filePath = filePath.substring(filePath.indexOf("/WEB-INF/"), filePath.length());
                    baseNames.add(filePath);
                    System.out.println("Added file to baseNames: " + filePath);
                }
            }
        }
    }

}

XML config:

<bean id="messageSource" class="com.mypackage.core.src.UnderDirectoryReloadableResourceBundleMessageSource">
  <property name="defaultEncoding" value="utf-8" />
  <property name="workingDirectory" value="/WEB-INF/webspring/i18n" />
  <property name="cacheSeconds" value="3" />
  <property name="fallbackToSystemLocale" value="false" />
</bean>

Enjoy!

Best Answer

Related Solutions

Java – @ModelAttribute in Spring MVC

Java – Spring MVC ResourceBundleMessageSource XML configuration

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