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📜  JSF-国际化

📅  最后修改于: 2020-10-23 06:49:32             🧑  作者: Mango

国际化是一种在程序中不对状态消息，GUI组件标签，货币，日期进行硬编码的技术。而是将它们存储在源代码之外的资源束中，并进行动态检索。 JSF提供了一种非常方便的方式来处理资源束。

需要以下步骤来内部化JSF应用程序。

步骤1：定义属性文件

为每个语言环境创建属性文件。名称应为<文件名> _ <语言环境> .properties格式。

文件名中可以省略默认语言环境。

messages.properties

greeting = Hello World!

messages_fr.properties

greeting = Bonjour tout le monde!

步骤2：更新faces-config.xml

faces-config.xml


   
      en
      fr
   
   
   
      com.tutorialspoint.messages
      msg

步骤3：使用resource-bundle var

home.xhtml

应用范例

让我们创建一个测试JSF应用程序以测试JSF中的国际化。

Step Description
1 Create a project with a name helloworld under a package com.tutorialspoint.test as explained in the JSF – First Application chapter.
2 Create resources folder under src → mai folder.
3 Create com folder under src → main → resources folder.
4 Create tutorialspoint folder under src → main → resources → com folder.
5 Create messages.properties file under src → main → resources → com → tutorialspoint folder. Modify it as explained below.
6 Create messages_fr.properties file under src → main → resources → com → tutorialspoint folder. Modify it as explained below.
7 Create faces-config.xml in WEB-INFf older as explained below.
8 Create UserData.java under package com.tutorialspoint.test as explained below.
9 Modify home.xhtml as explained below. Keep the rest of the files unchanged.
10 Compile and run the application to make sure the business logic is working as per the requirements.
11 Finally, build the application in the form of war file and deploy it in Apache Tomcat Webserver.
12 Launch your web application using appropriate URL as explained below in the last step.

messages.properties

greeting = Hello World!

messages_fr.properties

greeting = Bonjour tout le monde!

faces-config.xml



   
   
      
         en
         fr
      
      
      
         com.tutorialspoint.messages
         msg

UserData.java

package com.tutorialspoint.test;

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

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;
import javax.faces.event.ValueChangeEvent;

@ManagedBean(name = "userData", eager = true)
@SessionScoped
public class UserData implements Serializable {
   private static final long serialVersionUID = 1L;
   private String locale;

   private static Map countries;
      static {
      
      countries = new LinkedHashMap();
      countries.put("English", Locale.ENGLISH);
      countries.put("French", Locale.FRENCH);
   }

   public Map getCountries() {
      return countries;
   }

   public String getLocale() {
      return locale;
   }

   public void setLocale(String locale) {
      this.locale = locale;
   }

   //value change event listener
   public void localeChanged(ValueChangeEvent e) {
      String newLocaleValue = e.getNewValue().toString();
      
      for (Map.Entry entry : countries.entrySet()) {
         
         if(entry.getValue().toString().equals(newLocaleValue)) {
            FacesContext.getCurrentInstance()
               .getViewRoot().setLocale((Locale)entry.getValue());         
         }
      }
   }
}

home.xhtml





   
   
      JSF tutorial         
   
   
    
      
Internalization Language Example

      
      

         

         
          
            Language :

准备好所有更改后，让我们像在JSF-First Application一章中那样编译并运行该应用程序。如果您的应用程序一切正常，将产生以下结果。

JSF国际化结果

从下拉菜单更改语言。您将看到以下输出。

JSF国际化结果1