il8n国际化

    @Test
    public void testLocale() {
        // 语言参数和国家/地区参数都使用ISO标准语言代码表示，每种语言由两位小写字母表示，每个国家/地区由两个大写字母表示
        Locale locale = new Locale("zh", "CN");
    }
    @Test
    public void testLocale1() {
        Locale locale = Locale.getDefault();
        System.out.println(locale); // zh_CN
    }

    @Test
    public void numberFormat() {
        double amt = 123456.78;
        Locale locale = new Locale("zh", "CN");
        NumberFormat currFmt = NumberFormat.getCurrencyInstance(locale);
        System.out.println(currFmt.format(amt)); // ￥123,456.78
    }
    @Test
    public void dateFormat() {
        Date date = new Date();
        Locale locale = new Locale("en", "US");
        DateFormat df = DateFormat.getDateInstance(DateFormat.MEDIUM, locale); // 第一个参数是时间样式
        System.out.println(df.format(date)); // Jan 17, 2019
    }
    @Test
    public void messageFormat1() {
        // 以下两行是不同本地化的资源，{n}是占位符
        String pattern1 = "{0}，你好！你于{1}在工商银行存入{2} 元。";
        String pattern2 = "At {1,time,short} On {1,date,long}，{0} paid {2,number,currency}.";// short表示获取时分秒部分，long获取日期部分
        // 将要替换的变量
        Object[] params = {"John", new GregorianCalendar().getTime(),1.0E3};
        // 中国格式
        String msg1 = MessageFormat.format(pattern1,params);
        System.out.println(msg1); // John，你好！你于19-1-17 上午11:56在工商银行存入1,000 元。
        // 美国格式
        MessageFormat mf = new MessageFormat(pattern2, Locale.US);
        String msg2 = mf.format(params);
        System.out.println(msg2); // At 11:56 AM On January 17, 2019，John paid $1,000.00.
    }

greeting.common=How are you!
greeting.morning = Good morning!
greeting.afternoon = Good Afternoon!

greeting.common=How are you!
greeting.morning = Good morning!
greeting.afternoon = Good Afternoon!

greeting.common=\u60a8\u597d\uff01
greeting.morning=\u65e9\u4e0a\u597d\uff01
greeting.afternoon=\u4e0b\u5348\u597d\uff01

greeting.common=How are you! {0},today is {1}
greeting.morning = Good morning! {0},now is {1,time,short}
greeting.afternoon = Good Afternoon! {0} now is {1,date,long}

greeting.common=How are you! {0},today is {1}
greeting.morning = Good morning! {0},now is {1,time,short}
greeting.afternoon = Good Afternoon! {0}, now is {1,date,long}

greeting.common=\u60a8\u597d\uff01 {0}\uff0c\u4eca\u5929\u662f {1}
greeting.morning=\u65e9\u4e0a\u597d\uff01 {0}\uff0c\u73b0\u5728\u662f{1,time,short}
greeting.afternoon=\u4e0b\u5348\u597d\uff01 {0}\uff0c\u73b0\u5728\u662f{1,date,long}

    @Test
    public void resourceBoundle(){
        // 如果不指定本地化对象，将使用本地系统默认的本地化对象。
        ResourceBundle rb1 = ResourceBundle.getBundle("resource",Locale.US);
        ResourceBundle rb2 = ResourceBundle.getBundle("resource",Locale.CANADA);
        System.out.println("us:"+rb1.getString("greeting.common")); // us:How are you!
        System.out.println("cn:"+rb2.getString("greeting.common")); // cn:您好！
    }
    @Test
    // 在资源文件中使用占位符
    public void resourceBoundleFmt(){
        ResourceBundle rb1 = ResourceBundle.getBundle("fmt_resource",Locale.US);
        ResourceBundle rb2 = ResourceBundle.getBundle("fmt_resource",Locale.CHINA);
        Object[] params = {"John", new GregorianCalendar().getTime()};

        String str1 = new MessageFormat(rb1.getString("greeting.common"),Locale.US).format(params);
        String str2 =new MessageFormat(rb2.getString("greeting.morning"),Locale.CHINA).format(params);
        String str3 =new MessageFormat(rb2.getString("greeting.afternoon"),Locale.CHINA).format(params);
        System.out.println(str1);
        System.out.println(str2);
        System.out.println(str3);
    }