Developing I18N Applications in JSF

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Screenshot_17   

Abc-en-us.properties:

welcome.message=Welcome to the English US version.

Abc-it-IT.properties:

welcome.message=Benvenuti alla versione italiana.

Abc-it-IN.properties:

welcome.message=Benvenuti alla versione indiana.

FORM.HTML:

<html>
  <body>
    <form method="post" action="/i18n">
      <table>
        <tr>
          <td>Select language:</td>
          <td>Select country:</td>
        </tr>
        <tr>
          <td>
            <select name="language">
              <option value="en">English</option>
              <option value="it">Italian</option>
              <option value="hi">Hindi</option>
            </select>
          </td>
          <td>
            <select name="country">
              <option value="us">United States</option>
              <option value="it">Italy</option>
              <option value="in">India</option>
            </select>
          </td>
        </tr>
        <tr>
          <td>
            <input type="submit" value="Submit">
          </td>
        </tr>
      </table>
    </form>
  </body>
</html>

I18NServlet.java:

package com.soft;

import java.io.IOException;
import java.io.PrintWriter;
import java.text.DateFormat;
import java.text.NumberFormat;
import java.util.Date;
import java.util.Locale;
import java.util.ResourceBundle;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/i18n")
public class I18NServlet extends HttpServlet {

  private static final String BUNDLE_NAME = "Abc";
  private static final String WELCOME_MESSAGE_KEY = "welcome.message";
  private static final String HTML_START = "<html><body><h1>";
  private static final String HTML_END = "</h1></body></html>";

  @Override
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    try {
      String language = request.getParameter("language");
      String country = request.getParameter("country");
      Locale locale = new Locale(language, country);

      NumberFormat numberFormat = NumberFormat.getInstance(locale);
      DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.DEFAULT, locale);
      ResourceBundle bundle = ResourceBundle.getBundle(BUNDLE_NAME, locale);

      String welcomeMessage = bundle.getString(WELCOME_MESSAGE_KEY);

      PrintWriter out = response.getWriter();
      out.println(HTML_START);
      out.println("Number: " + numberFormat.format(1345.2345) + "<br>");
      out.println("Date: " + dateFormat.format(new Date()) + "<br>");
      out.println("Message: " + welcomeMessage);
      out.println(HTML_END);
    } catch (Exception e) {
      response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Invalid request");
    }
  }
}
  • If we use the above approach to provid II8N Support then every time user has to specify lang country, it is not suggestible in web applications.
  • To overcome the above problems, we have to provide I18N Support with out depending on the user, by getting client browser provided language setup
  • When we submit a request from a client browser then browser provided lang will be send to server in the from at “accept lang” request header, here it we get “accept-language” request header value then it is possible to identify from which local the request is coming, with this, we are able to provide I18N Support without specifying lang & country by the user
  • To get a particular request header value, we have to use the following method from servlet request, public string get header (String header-name)
  • Public class I18N Servlet extends Http servlet{ = IL; Protected void do Get(Http Servlet Request request, Http Servlef Response response) Throws servlet Exception, Ioexception{

Try{ String locate=request. get header(“accept-language”);

String Tokenizer st= new string tokenizer(local, “-”);

Int count= st. count tokens();

Local i=null;

If (count==1){ String long=st.next token();

I=new locale (c lang);

{ If(count==2){ String lang=st. next token();

String country=st. next token();

I=new locale (c lang, country); }

If(count==3){ String lang=st. next token();

String country=st.

next token();

String sys-var=st.

next token();

I=new locale (lang, country), sys-var); }

Number Format

nt=number formal,

get Insurance(l);

  Screenshot_18  

Abc-en. properties

# English language properties file
# Header
Header1 = Durga Software Solutions
Header2 = Registration Form

# Form fields
Sid = Student ID
Sname = Student Name
Semail = Email ID
Smobile = Contact No.

# Button
Button = Register

# Success and failure messages
Success = Student registration successful
Failure = Student registration failed

 Abc-it. Properties

Header1=Durga software solutions Header2=Registration Form Sid=student Id Sname=student Name Semail=email id Smobile=contact no Button=registration Success=student registration success Failure=student registration failure  

Abc-te. Properties

Header1=software solutions
Header2=Darakstu patram
Sid=vidyardu Gurdimpu snkya
Sname=vidyardi peru
Semail=vidyuth samachara Gurthimlu
Smobile=sampradimpu sankya
Button=Darakasthu
Success=Vidyardi Darakastu safalamayinadhi
Failure=Vidyardi Darakastu cifalamayinadhi

Index.html 

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <meta http-equiv="Refresh" content="2;URL=http://localhost:1010/I18napp/registrationform.dss">
        <title>Insert title here</title>
    </head>
    <body>
        <h1>Application is loading…</h1>
    </body>
</html>

Registrationform.JSP

  

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1" %>
<%@ taglib prefix="f" uri="http://java.sun.com/jsf/core" %>
<%@ taglib prefix="h" uri="http://java.sun.com/jsf/html" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>Insert title here</title>
  </head>
  <body>
    <f:view>
      <h:form>
        <h:panelGrid columns="2">
          <h:outputText value="#{msg.sid}" />
          <h:inputText id="sid" value="#{regBean.sid}" />
          <h:outputText value="#{msg.sname}" />
          <h:inputText id="sname" value="#{regBean.sname}" />
          <h:outputText value="#{msg.semail}" />
          <h:inputText id="semail" value="#{regBean.semail}" />
          <h:outputText value="#{msg.smobile}" />
          <h:inputText id="smobile" value="#{regBean.smobile}" />
          <h:commandButton value="#{msg.button}" action="#{regBean.registration}" />
        </h:panelGrid>
      </h:form>
    </f:view>
  </body>
</html>

Success. Jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1" %>
<%@ taglib prefix="f" uri="http://java.sun.com/jsf/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
      <title>Insert title here</title>
   </head>
   <body>
      <f:view>
         <h1><h:outputText value="#{msg.success}" /></h1>
      </f:view>
   </body>
</html>

Failure.jsp

<%@page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>Failure Page</title>
</head>
<body>
    <f:view>
        <h1><h:outputText value="#{msg.failure}" /></h1>
    </f:view>
</body>
</html>

Registration Bean.java

package com.soft;

import java.util.Locale;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;

public class RegistrationBean {
    private String sid;
    private String sname;
    private String semail;
    private String smobile;

    // getters and setters

    public String registration() {
        String status = "";
        if (sid.startsWith("DSS-")) {
            status = "success";
        } else {
            status = "failure";
        }
        return status;
    }

    public String getRegistrationForm() {
        return "Registration form";
    }
}

Faces-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<Faces-config xmlns="http://Java.sun.com/xml/ns/java" version="1.2">
    <managed-bean>
        <managed-bean-name>regBean</managed-bean-name>
        <managed-bean-class>com.DurgaSoft.RegistrationBean</managed-bean-class>
        <managed-bean-scope>session</managed-bean-scope>
    </managed-bean>
    <navigation-rule>
        <from-view-id>/registrationform.jsp</from-view-id>
        <navigation-case>
            <from-outcome>success</from-outcome>
            <to-view-id>/success.jsp</to-view-id>
        </navigation-case>
        <navigation-case>
            <from-outcome>failure</from-outcome>
            <to-view-id>/failure.jsp</to-view-id>
        </navigation-case>
    </navigation-rule>
    <navigation-rule>
        <from-view-id>/menu.jsp</from-view-id>
        <navigation-case>
            <from-outcome>registration form</from-outcome>
            <to-view-id>/registrationform.jsp</to-view-id>
        </navigation-case>
    </navigation-rule>
    <application>
        <locale-config>
            <default-locale>en</default-locale>
            <supported-locale>it</supported-locale>
            <supported-locale>te</supported-locale>
        </locale-config>
        <resource-bundle>
            <base-name>abc</base-name>
            <var>msg</var>
        </resource-bundle>
    </application>
</Faces-config>

Web.xml

Same as prev. applications.      

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