Tech-Today

Loading locale from POST/GET parameter

This page will summarize how to load a resource bundle dynamically from a GET/POST parameter.

1.) In your mail xhtml template, make sure that you define f:view locale before the h:body tag:

<f:view locale="#{languageBean.currentLocale}" />

2.) Create a LanguageBean managed-bean:

package com.sido.mg.mbean;

import java.io.Serializable;
import java.util.LinkedHashMap;
import java.util.Locale;
import java.util.Map;

import javax.enterprise.context.SessionScoped;
import javax.faces.context.FacesContext;
import javax.inject.Inject;
import javax.inject.Named;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Edward P. Legaspi
 * @since Jan 17, 2013
 */
@Named
@SessionScoped
public class LanguageBean implements Serializable {
 private static final long serialVersionUID = 1L;
 private static Map supportedLocales;
 private Logger log = LoggerFactory.getLogger(LanguageBean.class);

 @Inject
 private transient Locale currentLocale;

 static {
  supportedLocales = new LinkedHashMap<>();
  supportedLocales.put("English", Locale.US);
  supportedLocales.put("日本語 言語", Locale.JAPAN);
 }

 public Map getSupportedLocales() {
  return supportedLocales;
 }

 public Locale getCurrentLocale() {
  if (currentLocale == null || currentLocale.equals("")) {
   currentLocale = Locale.US;
  }

  return currentLocale;
 }

 public void setCurrentLocale(Locale currentLocale) {
  this.currentLocale = currentLocale;
 }

 public String switchLanguage(String language) {
  log.debug("changing locale to={}", language);
  if (language.equals("EN")) {
   currentLocale = Locale.US;
  } else {
   currentLocale = Locale.JAPAN;
  }

  return FacesContext.getCurrentInstance().getViewRoot().getViewId() + "?faces-redirect=true";
 }

 public String getEntrustLocale() {
  if (currentLocale == Locale.US) {
   return "9";
  } else {
   return "28";
  }
 }
}

3.) The flags:

<ul class="right">
 <li><p:commandLink immediate="true"
   action="#{languageBean.switchLanguage('EN')}">
   <h:graphicImage library="img" name="flags/us.png"></h:graphicImage>
  </p:commandLink></li>
 <li><p:commandLink immediate="true"
   action="#{languageBean.switchLanguage('JP')}">
   <h:graphicImage library="img" name="flags/jp.png"></h:graphicImage>
  </p:commandLink></li>
</ul>

4.) Now in your receiver bean's PostConstruct annotated method, read the context parameter and set the locale:

@PostConstruct
public void init() throws RuntimeException, IOException {
 ExternalContext context = FacesContext.getCurrentInstance().getExternalContext();

 Map requestParameters = context.getRequestParameterMap(); 
 // set locale
 try {
  languageBean.setCurrentLocale(LocaleUtils.toLocale(requestParameters.get("locale")));
 } catch (IllegalArgumentException | NullPointerException e) {
  languageBean.setCurrentLocale(Locale.JAPAN); 
 }
}

5.) For the initial page load, the first time a request has been receive you need to manually reload the page for the locale to take effect:

<script type="text/javascript">
 window.onload = function() {
  if (!window.location.hash) {
   window.location = window.location + '#loaded';
   window.location.reload();
  }
 }
</script>

- Social Login Using Rest Fb
This is an implementation tutorial on how we can use REST FB to enable facebook social login on our web application. Basically, it's a project created from javaee7-war template. To run this app you need to set up a Facebook application with callback...

- Do Some Initialization Work After The Web Application Initialization Process
We can achieve this by using a webListener. See code below: package com.czetsuya; import java.text.MessageFormat; import java.util.ResourceBundle; import javax.inject.Inject; import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener;...

- How To Call A Javaee Rest Web Service With Basic Authentication Using Jquery Ajax
I don't really remember when I coded it, nor where I got it but I'm writing it here for future use :-) Below is the code I use to test CORS, http://en.wikipedia.org/wiki/Cross-origin_resource_sharing. <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>...

- How To Load Property File From Glassfish Config's Folder
In seam you can define a component class in components.xml that will load the properties from the JBOSS_CONFIG folder. Add the ff lines: <component name="paramBean" class="com.ipil.PropertyBean" scope="application" auto-create="true" startup="true">...

- How To Auto Wire A Spring Bean From A Jsf Managed Bean In Liferay Portlet
There are 2 ways I know to auto-wire a spring bean into a jsf managed bean: 1.) Is through WebApplicationContext, invoke during jsf managed bean constructor: Below are the most vital files to perform this action: web.xml <?xml version="1.0"?>...

Tech-Today