[JAVA_Spring]建立一個SpringMVC Annotation Project 3 -1 國際化(i18n)－程式開發學習之路

本文使用 Spring Web model-view-controller (MVC) framework
建立一個簡單的一個Hello World 程式

1、請參考建立一個SpringMVC Annotation Project - Hello World此篇文章，以下是以此作為延伸

2. 文件放置位置

3. 建立Controller & Mapping
在Spring 3 裡大量使用 annotation 。

如：
@Controller
目錄 : src/main/java/com/sample/web/controller
檔名 : HelloController.java

程式碼：

package com.sample.web.controller;



import java.util.Locale;



import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.MessageSource;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.servlet.ModelAndView;



@Controller

public class HelloController{

 

 @Autowired

 MessageSource messageSource;



 @RequestMapping(value = { "/", "/welcome**" }, method = RequestMethod.GET)

 public ModelAndView welcomePage() {

  System.out.println(messageSource.getMessage(

                                                "hello.springmvc", null, Locale.CHINA));

  System.out.println(messageSource.getMessage(

                                                "hello.springmvc", null, Locale.ENGLISH));

  System.out.println(messageSource.getMessage(

                                                "hello.springmvc", null, Locale.TAIWAN));

  return new ModelAndView("hello");

 }



}

5. 建立JSP 頁面
目錄 : src/main/webapp/WEB-INF/pages/
檔名 : hello.jsp

程式碼：
<%@ page contentType="text/html;charset=UTF-8" %>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %> <html> <body> Language : <a href="?language=en">English</a>| <a href="?language=zh_CN">Chinese</a>| <a href="?language=zh_TW">Taiwan</a> <h3> hello.springmvc : <spring:message code="hello.springmvc" text="default text" /> </h3> Current Locale : ${pageContext.response.locale} </body> </html>

6. 建立properties 頁面
目錄 : src/main/resources/i18n
檔名 : messages_en.properties

檔名 : messages_zh_CN.properties

檔名 : messages_zh_TW.properties

7. 建立AppConfig.java (Spring設定)
目錄 : src/main/java/com/sample/config
檔名 : AppConfig.java

package com.sample.config;



import java.util.Locale;



import org.springframework.context.MessageSource;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.ComponentScan;

import org.springframework.context.annotation.Configuration;

import org.springframework.context.support.ReloadableResourceBundleMessageSource;

import org.springframework.web.servlet.HandlerInterceptor;

import org.springframework.web.servlet.LocaleResolver;

import org.springframework.web.servlet.config.annotation.EnableWebMvc;

import org.springframework.web.servlet.config.annotation.InterceptorRegistry;

import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;

import org.springframework.web.servlet.i18n.SessionLocaleResolver;

import org.springframework.web.servlet.view.InternalResourceViewResolver;

import org.springframework.web.servlet.view.JstlView;





@EnableWebMvc

@Configuration

@ComponentScan({ "com.sample.web.*" })

public class AppConfig extends WebMvcConfigurerAdapter{

 

    /**

     * 加入SPRING攔截器

     */

    @Override

    public void addInterceptors(InterceptorRegistry registry) {

        registry.addInterceptor(localeChangeInterceptor());

    }

    

    /**

     * i18n 國際化(可改變區域)

     * @return HandlerInterceptor

     */

    @Bean

    public HandlerInterceptor localeChangeInterceptor() {

        LocaleChangeInterceptor localeChangeInterceptor 

             = new LocaleChangeInterceptor();

        localeChangeInterceptor.setParamName("language");

        return localeChangeInterceptor;

    }

    

    /**

     * 區域解析器

     * @return LocaleResolver

     */

    @Bean

    public LocaleResolver localeResolver() {

     SessionLocaleResolver sessionLocaleResolver = new SessionLocaleResolver();

     sessionLocaleResolver.setDefaultLocale(Locale.TAIWAN);

        return sessionLocaleResolver;

    }

    

    /**

     * i18n文件放置位置

     * @return MessageSource

     */

    @Bean    

    public MessageSource messageSource() {

        ReloadableResourceBundleMessageSource messageSource 

                = new ReloadableResourceBundleMessageSource();

        messageSource.setUseCodeAsDefaultMessage(true);

        messageSource.setBasename("classpath:i18n/messages");

        messageSource.setDefaultEncoding("UTF-8");

        messageSource.setCacheSeconds(0);

        return messageSource;

    }



    /**

     * 頁面導向

     * @return

     */

     @Bean

     public InternalResourceViewResolver viewResolver() {

 InternalResourceViewResolver viewResolver 

     = new InternalResourceViewResolver();

 viewResolver.setViewClass(JstlView.class);

 viewResolver.setPrefix("/WEB-INF/pages/");

 viewResolver.setSuffix(".jsp");

 return viewResolver;

    }

 

}