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<fmt:bundle> 标签

The <fmt:bundle> tag makes the specified resource bundle available to the <fmt:message> tag within the <fmt:bundle> tag. This can save many steps of specifying the resource bundle for each <fmt:message> tag.

For example, the following two <fmt:bundle> blocks will produce the same output:

<fmt:bundle basename="com.w3codebox.Example">
    <fmt:message key="count.one"/>
</fmt:bundle>
<fmt:bundle basename="com.w3codebox.Example" prefix="count.">
    <fmt:message key="title"/>
</fmt:bundle>

Syntax format

<fmt:bundle baseName="<string>" prefix="<string>"/>

Attribute

The <fmt:bundle> tag has the following attributes:

Attribute	Description	Is it necessary	Default value
basename	Specify the base name of the resource bundle to be loaded	Yes	None
prefix	Specify the prefix for the key attribute of the <fmt:message> tag	No	None

Program Example

The resource bundle contains locale-specific objects. The resource bundle contains key-value pairs. When your program needs locale-specific resources, you can share all the key-value pairs with all locales, but you can also specify the converted values for the locale. The resource bundle can help provide content specified for the locale.

A Java resource bundle file contains a series of key-value pairs. The methods we are concerned with involve creating compiled Java classes that inherit from the java.util.ListResourceBundle class. You must compile these classes and place them in your Web application's CLASSPATH.

Let's define a default resource bundle:

package com.w;3codebox;
import java.util.ListResourceBundle;
public class Example_En extends ListResourceBundle {
  public Object[][] getContents() {
    return contents;
  }
  static final Object[][] contents = {
  {"count.one", "One"},
  {"count.two", "Two"},
  {"count.three", "Three"},
  };
}

Compile the above file to Example.class, then place it in a location that the Web application's CLASSPATH can find. Now you can use JSTL to display these three numbers, like this:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<html>
<head>
<title>JSTL fmt:bundle Tag</title>
</head>
<body>
<fmt:bundle basename="com.w3codebox.Example" prefix="count.">
   <fmt:message key="one">/><br/>
   <fmt:message key="two"/><br/>
   <fmt:message key="three"/><br/>
</fmt:bundle>
</body>
</html>

Os resultados da execução são os seguintes:

One 
Two 
Three

Mude para sem atributo prefix:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<html>
<head>
<title>JSTL fmt:bundle Tag</title>
</head>
<body>
<fmt:bundle basename="com.w3codebox.Example">
   <fmt:message key="count.one"/><br/>
   <fmt:message key="count.two"/><br/>
   <fmt:message key="count.three"/><br/>
</fmt:bundle>
</body>
</html>

Os resultados da execução são os seguintes:

One 
Two 
Three

pode ver<fmt:setLocale>e<fmt:setBundle>para obter mais informações.

Biblioteca de Tags Padrão JSP

Conexão com o Banco de Dados JSP Biblioteca de Tags Padrão JSP (JSTL)