我创建了以下JSP：
<!-- WebContent/pages/ResourceBundlesJST.jsp -->
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page import="java.text.*" %>
<%@ page import="java.util.*" %>
<%@ page import="hu.flux.locale.LanguageToolkit" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%
Locale locale = LanguageToolkit.getLanguage(request);
//String locale = LanguageToolkit.getLanguageString(request);
%>
<fmt:setLocale value="${locale}" />
<fmt:bundle basename="hu.flux.locale.resources.TestResources">
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1><fmt:message key="greetHeading"/></h1>
<p><fmt:message key="welcomeText"/></p>
<p>Your locale is <%= locale %>.</p>
<form action="your_form_handler_here" method="post">
<div>
<label for="name"><fmt:message key="namePrompt"/></label>
<input type="text" id="name" name="name">
</div>
<div>
<label for="age"><fmt:message key="agePrompt"/></label>
<input type="text" id="age" name="age">
</div>
<div>
<label for="place"><fmt:message key="placePrompt"/></label>
<input type="text" id="place" name="place">
</div>
<input type="submit" value="<fmt:message key="submitButtonText"/>">
</form>
</body>
</html>
</fmt:bundle>
当我尝试使用此网址访问该网页时：
http://localhost:8080/SamsTeachYourselfJSP/pages/ResourceBundlesJSTL.jsp?languageOverride=de_DE
这将显示在屏幕上：
Hello!
Welcome to our web site. Please take a moment to fill out our survey
Your locale is de_DE.
What is your name:
How old are you:
Where do you live:
该页面显然正在查找和使用英语属性文件而不是德语属性文件，即使服务器选择了我的参数来将语言环境设置为de_DE并接受命令来设置语言环境。
我希望它调用的资源包含：
# /src/hu/flux/locale/resources/TestResources_de.properties
namePrompt=Wie hei[gb]en Sie:
agePrompt=Wie alt sind Sie:
placePrompt=Wo wohnen Sie:
greetHeading=Guten Tag!
welcomeText= Willkommen bei unserer Web-Site. Bitte, dauern Sie einen Moment Um unsere Umfrage auszufüllen
submitButtonText=Senden
我很确定问题不在我的LanguageToolkit类中，因为它适用于此页面的非JSTL版本，但如果有人想看到它：
/**
* /src/hu/flux/locale/LanguageToolkit.java
*/
package hu.flux.locale;
import java.util.Locale;
import java.util.StringTokenizer;
import javax.servlet.http.HttpServletRequest;
/**
* @author Brian Kessler
*
*/
public class LanguageToolkit {
/**
*
*/
public LanguageToolkit() {
// TODO Auto-generated constructor stub
}
public static Locale getLanguage(HttpServletRequest request)
{
Locale locale = Locale.getDefault();
// Get the browser's preferred language.
String acceptLangString = request.getHeader("ACCEPT-LANGAUGE");
// Allow the user to override the browser's langauge setting.
// This lets you test with tools such as Babelfish
// (which isn't that great at translating to begin with).
String override = request.getParameter ("languageOverride");
if (override != null) { acceptLangString = override; }
// If there is an ACCEPT-LANGUAGE header, parse it.
if (acceptLangString != null)
{
Locale acceptedLocale = parseLangString (acceptLangString);
if (acceptedLocale != null) {locale = acceptedLocale;}
}
return locale;
}
public static String getLanguageString(HttpServletRequest request)
{
String locale = "EN-uk";
// Get the browser's preferred language.
String acceptLangString = request.getHeader("ACCEPT-LANGAUGE");
// Allow the user to override the browser's langauge setting.
// This lets you test with tools such as Babelfish
// (which isn't that great at translating to begin with).
String override = request.getParameter ("languageOverride");
if (override != null) { acceptLangString = override; }
// If there is an ACCEPT-LANGUAGE header, parse it.
if (acceptLangString != null) {locale = acceptLangString;}
return locale;
}
private static Locale parseLangString(String acceptLangString)
{
// The accepted languages should be separated by commas, but also
// add space as a separator to eliminate whitespace.
StringTokenizer localeParser = new StringTokenizer(acceptLangString, " ,");
// See whether there is a language in the list (you need only the first one).
if (localeParser.hasMoreTokens())
{
// Get the locale.
String localeStr = localeParser.nextToken();
// The local should be in the format ll-CC where 11 is the language
// and CC is the country, like en-US for English in the U.S. and
// de-DE for German in Germany. Allow the browser to use _ instead
// of -, too.
StringTokenizer localeSplitter = new StringTokenizer (localeStr, "_-");
// Assume both values are blank.
String language = "";
String country = "";
// See whether a language is specified.
if (localeSplitter.hasMoreTokens()) {language = localeSplitter.nextToken(); }
// See whether a country is specified (there won't always be one).
if (localeSplitter.hasMoreTokens()) {country = localeSplitter.nextToken(); }
// Create a local based on this language and country (if country is blank,
// you'll still get locale-based text, but currencies won't display correctly.
return (new Locale(language, country));
}
return null;
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
}
}
为什么我会看到英语以及如何解决这个问题？
答案 0 :(得分：1)
有两个问题：
首先，fmt:setLocale TLDDOC说明如下：
value-java.lang.String- 字符串值被解释为区域设置的可打印表示形式，必须包含两个字母（小写）语言代码（由ISO-639）定义，并且可以包含两个字母（大写）国家代码（由ISO-3166定义）。语言和国家/地区代码必须用连字符（ - ）或下划线（_）分隔。
换句话说，您无法使用java.util.Locale设置它。
其次，在EL中无法访问使用 scriptlet 声明的任何内容。 EL只能通过其PageContext方法访问HttpServletRequest，HttpSession，ServletContext或setAttribute()中放置的属性。在封面下，EL基本上为${name}执行了pageContext.findAttribute(name)。从最少到最佳推荐顺序基本上有4种解决方案：
<fmt:setLocale>。request.setAttribute("locale", locale);的请求范围内。LanguageToolkit为EL函数。Filter来完成工作。也就是说，我建议在这种特殊情况下使用<fmt:setBundle>代替<fmt:bundle>，因为您似乎想要覆盖整个页面。我还建议使用HttpServletRequest#getLocale()而不是手动解析请求标头。正确的算法比你目前的算法更复杂。