I18N庫(kù)主要完成：
    1.web應(yīng)用程序的國(guó)際化
    2.消息、日期的格式化
1.<fmt:formatNumber>:在jsp頁(yè)面中格式化數(shù)字
        <fmt:formatNumber 
                var="存放結(jié)果的變量"
                value="將被格式化的數(shù)字"
                scope="范圍"
                type="number/currency/percent"http://數(shù)字，貨幣，百分比
                currencyCode="cny/usd" //cny:人民幣 usd:美元
                currencySymbol="羊/$" //標(biāo)準(zhǔn)貨幣符號(hào)
                groupingUsed="true/false" //是否將數(shù)字進(jìn)行區(qū)隔 如：123，456，00
                maxFractionDigits="最多小數(shù)位數(shù)"
                maxIntegerDigits="最多整數(shù)位數(shù)"
                minFractionDigits="最少小數(shù)位數(shù)"
                minIntegerDigits="最少整數(shù)位數(shù)"
                pattern="格式化數(shù)字用的樣式" //如：####.##
    />
        eg:
            <fmt:formatNumber var="result" value="6789.3581" type="currency" maxFractionDigits="2" groupingUsed="true"/>
            <c:out value="${result}"/> :6,789.36
2.<fmt:parseNumber>:在jsp頁(yè)面中實(shí)現(xiàn)將字符串形式的數(shù)字、貨幣、百分比轉(zhuǎn)換成數(shù)字
        <fmt:parseNumber
                var="存放轉(zhuǎn)換結(jié)果的變量"
                value="將轉(zhuǎn)換的值"
                scope="范圍"
                type="number/currency/percent"
                parseLocale="zh_CN,en"http://語(yǔ)言地區(qū)代碼
                integerOnly="true/false"是否只顯示整數(shù)部分
                pattern="$$$$.$$"http://格式化數(shù)字所用的樣式
        />
        eg:
         <fmt:parseNumber var="result" value="yang 6789.36" type="currency"/>   輸出結(jié)果為：6789.36
         <fmt:parseNumber var="result" value="78.90%" type="percent"/>             輸出結(jié)果為：0.789
3.<fmt:formatDate>：在jsp頁(yè)面中實(shí)現(xiàn)格式化日期和時(shí)間
        <fmt:formatDate
            var="存放格式化結(jié)果的變量"
            value="將被格式化的日期或時(shí)間"
            scope="page/request/session/application"
            type="time/date/both" //time:時(shí)間 date:日期 both:時(shí)間和日期
            dateStyle="default/short/medium/logn/full"  //日期的顯示方式
            timeStyle="default/short/medium/logn/full"  //時(shí)間的顯示方式            
            timeZone="CST" 設(shè)置時(shí)區(qū)：CST:中部標(biāo)準(zhǔn)時(shí)間
            pattern="yyyy 年MM 月dd日 hh:mm:ss"
        </fmt:fomatDate>
4.<fmt:parseDate>:將字符串形式的時(shí)間和日期轉(zhuǎn)換成日期時(shí)間類型
       <fmt:parseDate
                var="varName"
                value="value"
                scope="request"
                type="time/date/both"
                dateStyle="default/short/medium/long/full"
                timeStyle="default/short/medium/long/full"
                timeZone="timeZone"
                pattern="pattern"/>
        eg:
        <c:set var="now" value="2008-05-26 11:04:00"/>
        <fmt:parseDate var="result" value="{now}" type="both"/>
        <c:out value="${result}"/>   
5.<fmt:setLocale>
      <fmt:setLocale value="zh_CN,en" //語(yǔ)言地區(qū)碼
                              variant="瀏覽器類型" // Win,Mac
                               scope="request等"/>
6.<fmt:setBundle>：設(shè)置默認(rèn)消息資源
       <fmt:setBundle basename="basename"http:// 資源名稱，如：MessageResource
                               var="存放資源文件名稱的變量"
                               scope="request"/>
    eg:
        <fmt:setLocale value="zh_CN"/>
        <fmt:setBundle basename="MessageResource"/>//假如有一個(gè)MessageResource.properties信息資源文件
7.<fmt:message>:在指定的消息資源文件中按關(guān)鍵字取出相應(yīng)的消息內(nèi)容
    <fmt:message key="messageKey"/>
     eg:
            <jsp:useBean id="now" class="java.util.Date"/>
            <fmt:formatDate value="${now} var="result"/>
            <fmt:setLocale value="zh_CN"/>
             <fmt:setBundle basename="MessageResource"/>
             <fmt:message key="hello">
                    <fmt:param value="lhb"/>
            </fmt:message>
            <fmt:message key="today">
                    <fmt:param value="${result}"/>
            </fmt:message>