fmt 国际化格式标签库（读取application.properties文件）

叁歲伎倆 2022-08-27 12:42 255阅读 0赞

国际化格式标签库包括国际化，消息和数字日期格式化:

(1) 国际化:<fmt:setLocale> <fmt::requestEncoding>

如:

![None.gif][] <% @ page language = " java " contentType = " text/html; charset=gb2312 " import = " java.util.\* " %> 
![None.gif][] <% @ taglib prefix = " c " uri = " http://java.sun.com/jsp/jstl/core " %> 
![None.gif][] <% @ taglib prefix = " fmt " uri = " http://java.sun.com/jsp/jstl/fmt " %> 
![None.gif][] <! DOCTYPE html PUBLIC " \-//W3C//DTD HTML 4.01 Transitional//EN " " http://www.w3.org/TR/html4/loose.dtd " > 
![None.gif][] < html > 
![None.gif][] < head > 
![None.gif][] < meta http \- equiv = " Content-Type " content = " text/html; charset=ISO-8859-1 " > 
![None.gif][] < title > Insert title here </ title > 
![None.gif][] </ head > 
![None.gif][] < body > 
![None.gif][] < c:set var = " todayValue " value = " <%=new Date() %> " /> 
![None.gif][] 
![None.gif][]中文－大陆: < fmt:setLocale value = " zh " /> 
![None.gif][] < fmt:formatDate value = " $\{todayValue\} " /> 
![None.gif][]中文 \- 台湾 < fmt:setLocale value = " zh\_tw " /> 
![None.gif][] < fmt:formatDate value = " $\{todayValue\} " /> 
![None.gif][]中文 \- 新加坡 < fmt:setLocale value = " zh\_sg " /> 
![None.gif][] < fmt:formatDate value = " $\{todayValue\} " /> 
![None.gif][]英文: < fmt:setLocale value = " en " /> 
![None.gif][] < fmt:formatDate value = " $\{todayValue\} " /> 
![None.gif][] </ body > 
![None.gif][] </ html >

页面输出:

![None.gif][] 中文－大陆: 2007-12-25  
![None.gif][]中文-台湾 2007/12/25  
![None.gif][]中文-新加坡 25-十二月-07  
![None.gif][]英文: Dec 25, 2007

(2)消息标签:<fmt:bundle> <fmt:message> <fmt:setBundle> <fmt:param>

如:

![None.gif][] <% @ page language = " java " contentType = " text/html; charset=gb2312 " import = " java.util.\* " %> 
![None.gif][] <% @ taglib prefix = " fmt " uri = " http://java.sun.com/jsp/jstl/fmt " %> 
![None.gif][] <% @ taglib prefix = " c " uri = " http://java.sun.com/jsp/jstl/core " %> 
![None.gif][] <! DOCTYPE html PUBLIC " \-//W3C//DTD HTML 4.01 Transitional//EN " " http://www.w3.org/TR/html4/loose.dtd " > 
![None.gif][] < html > 
![None.gif][] < head > 
![None.gif][] < title > bundle test </ title > 
![None.gif][] </ head > 
![None.gif][] < body > 
![None.gif][] < fmt:bundle basename = " dbconn " > 
![None.gif][]数据库驱动程序名: < fmt:message key = " driverName " /> 
![None.gif][]连接字符串: < fmt:message key = " connString " /> 
![None.gif][]用户名: < fmt:message key = " userName " /> 
![None.gif][]密码: < fmt:message key = " password " var = " password " /> 
![None.gif][] < c:out value = " $\{password\} " /> 
![None.gif][]名字: < fmt:message key = " name " /> 
![None.gif][]动态提示信息: < fmt:message key = " messageTemp " /> 
![None.gif][] </ fmt:bundle > 
![None.gif][] 
![None.gif][]  
![None.gif][] < c:set var = " todayTemp " value = " <%=new Date() %> " /> 
![None.gif][] < fmt:setBundle basename = " dbconn " /> 
![None.gif][]动态提示信息: 
![None.gif][] < fmt:message key = " messageTemp " > 
![None.gif][] < fmt:param >王四 </ fmt:param > 
![None.gif][] < fmt:param value = " $\{todayTemp\} " ></ fmt:param > 
![None.gif][] </ fmt:message > 
![None.gif][] 
![None.gif][] </ body > 
![None.gif][] </ html >

其对应的读取文件为dbconn.properties(当然是放在web-inf/classes下了),内容为:

![None.gif][] \#SQL Server  
![None.gif][]driverName=com.microsoft.jdbc.sqlserver.SQLServerDriver  
![None.gif][]connString=jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=testDatabase  
![None.gif][]userName=sa  
![None.gif][]password=123456  
![None.gif][]name=陈三  
![None.gif][]messageTemp=myname is \{0\},today is \{1,date\}  
![None.gif][]

其页面输出为:

![None.gif][] 数据库驱动程序名:com.microsoft.jdbc.sqlserver.SQLServerDriver  
![None.gif][]连接字符串:jdbc:microsoft:sqlserver: // localhost:1433;DatabaseName=testDatabase   
![None.gif][] 用户名:sa  
![None.gif][]密码:  123456   
![None.gif][]名字:陈三  
![ExpandedBlockStart.gif][]动态提示信息:myname is  \{ 0\} ,today is  \{ 1,date\}   
![None.gif][]动态提示信息: myname is 王四,today is  2007 \- 12 \- 25

解释一下其中的几个标签：

<fmt:bundle>标签用于绑定数据源.properties文件；

<fmt:bundle basename="源文件名,且不能带后缀哦,如上例就可以了" prefix=""> 语句，代码等 </fmt:bundle>

<fmt::message>标签用于从指定的资源文件中把指定的键值取出来；

<fmt:message key="" \[var="varname"\] \[bundle=""\] \[scope="page|..."\]/> 如果用到var的话就不会在页面直接输出，而需要用到<c:out>标签来进行页面的输出，如上例;

<fmt:message>标签可以配合<fmt:param>标签来进行设定<fmt:message>标签指向键的动态值,如上例;

<fmt:setBundle>标签用于设置默认的数据来源;

<fmt:setBundle>标签用来设置默认的数据来源; <fmt:setBundle basename="" \[ var=""\] \[scope="" \] />

(3)

<fmt:formatNumber>标签用于根据设定的区域将数据格式化输出；

<fmt:formatDate>标签用于格式化输出日期和时间;

<fmt:parseDate>标签用于把字符串类型的日期和时间转换成日期型数据类型;