14.国际化信息

1. 数字格式化

public static void formatNum () {
        Locale locale = new Locale("en", "US");
        NumberFormat numberFormat = NumberFormat
                .getCurrencyInstance(locale);

        double amt = 1234.89;
        System.out.println(numberFormat.format(amt));
    }

$1,234.89

2. 日期格式化

public static void formatDate () {
        Locale locale = new Locale("zh", "CN");
        DateFormat format = DateFormat.getTimeInstance(DateFormat.MEDIUM, locale);

        System.out.println(format.format(new Date()));
}

11:26:06

3. 消息格式化

public static void formatMsg() {
        String pattern1 = "hello {0}, time:{1}, money:{2}";
        String pattern2 = "at {1,time,short} on {1,date,long},{0} paid{2,number,currency}";

        Object[] params = {"John", new GregorianCalendar().getTime(), 1.0E3};

        String msg1 = MessageFormat.format(pattern1, params);

        MessageFormat messageFormat = new MessageFormat(pattern2, Locale.US);

        String msg2 = messageFormat.format(params);

        System.out.println(msg1);
        System.out.println(msg2);
    }

hello John, time:18-10-28 上午11:26, money:1,000
at 11:26 AM on October 28, 2018,John paid$1,000.00

4. 资源化文件

public static void resourceBoundle() {
        ResourceBundle resourceBundle = ResourceBundle.getBundle("locale/resource", Locale.US);
        System.out.println(resourceBundle.getString("hello"));
        resourceBundle = ResourceBundle.getBundle("locale/resource", Locale.CHINA);
        System.out.println(resourceBundle.getString("hello"));
        resourceBundle = ResourceBundle.getBundle("locale/resource", Locale.CHINESE);
        System.out.println(resourceBundle.getString("hello"));

        resourceBundle = ResourceBundle.getBundle("locale/resource");
        System.out.println(resourceBundle.getString("hello"));
    }

resource_en_US.properties

hello=hello

resource.properties

hello=你好-default

hello
你好-default
你好-default
你好-default

5. 动态资源文件

fmt_resource_en_US.properties

hello=hello,{0},time:{1}

fmt_resource_zh_CN.properties

hello=你好,{0},时间：{1}

public static void resourceBoundleDynamic() {
        ResourceBundle resourceBundle = ResourceBundle.getBundle("locale/fmt_resource", Locale.US);
        String msgUs = resourceBundle.getString("hello");
        resourceBundle = ResourceBundle.getBundle("locale/fmt_resource", Locale.CHINA);
        String msgCn = resourceBundle.getString("hello");

        MessageFormat mfUs = new MessageFormat(msgUs, Locale.US);
        MessageFormat mfCn = new MessageFormat(msgCn, Locale.CHINA);

        Object[] params = {"Presley", new GregorianCalendar().getTime()};
        System.out.println(mfUs.format(params));
        System.out.println(mfCn.format(params));
    }

Output:

hello,Presley,time:10/28/18 11:26 AM
你好,Presley,时间：18-10-28 上午11:26

4. Spring MessageSource-without Application

1. 资源文件

   1. resource_en_US.properties

      hello=hello,{0},time:{1}
      

   2. resource_zh_CN.properties

      hello=你好,{0},时间：{1}
      

2. Xml:

   <?xml version="1.0" encoding="UTF-8"?>
   <beans xmlns="http://www.springframework.org/schema/beans"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xmlns:p="http://www.springframework.org/schema/p"
          xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd "
           default-autowire="default">
   
       <bean id="myResource" class="org.springframework.context.support.ResourceBundleMessageSource">
           <property name="basenames">
               <list>
                   <value>i18n.resource</value>
               </list>
           </property>
       </bean>
   </beans>
   

3. Test

   public static void testWithoutApplication() {
           Resource resource = new ClassPathResource("i18n/applicationContext.xml");
           XmlBeanFactory xmlBeanFactory = new XmlBeanFactory(resource);
           MessageSource messageSource = xmlBeanFactory.getBean(MessageSource.class);
   
           Object[] params = {"Presley", new GregorianCalendar().getTime()};
   
           String msgCn = messageSource.getMessage("greetingew", params, "default",  Locale.CHINA);
           String msgZh = messageSource.getMessage("greeting", params, Locale.US);
   
           System.out.println(msgCn);
           System.out.println(msgZh);
       }
   

4. Output:

   default
   你好, Presley, 现在时间: 10/28/18 11:36 AM
   

5. Spring MessageSource-with Application

1. 资源文件：同上

2. Xml:

   <?xml version="1.0" encoding="UTF-8"?>
   <beans xmlns="http://www.springframework.org/schema/beans"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xmlns:p="http://www.springframework.org/schema/p"
          xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd "
           default-autowire="default">
   
       <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
           <property name="basenames">
               <list>
                   <value>i18n.resource</value>
               </list>
           </property>
       </bean>
   </beans>
   

3. Test

   public static void testWitApplication() {
           ApplicationContext applicationContext = new ClassPathXmlApplicationContext("i18n/application.xml");
   
           Object[] params = {"Presley", new GregorianCalendar().getTime()};
   
           String msgCn = applicationContext.getMessage("greeting", params, "default",  Locale.CHINA);
           String msgZh = applicationContext.getMessage("greeting", params, Locale.US);
   
           System.out.println(msgCn);
           System.out.println(msgZh);
       }
   

4. Output:

   hello, Presley, current time: 18-10-28 上午11:38
   你好, Presley, 现在时间: 10/28/18 11:38 AM
   

5. 注意：使用ApplicationContext, bean的名字必须为messageSource,否则报异常：

   Exception in thread "main" org.springframework.context.NoSuchMessageException: No message found under code 'greeting' for locale 'en_US'.