What makes the labels in multi-lingual page appear in the form of question marks?-CodePudding

I am developing a multi-lingual page with JSTL, when I run the code, I got the following output:

English German Spanish
???label.greeting???

???label.firstname??? John
???label.lastname??? Doe

???label.welcome???

Here is the JSP page:

<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<c:set var="theLocale" 
       value="${not empty param.theLocale ? param.theLocale : pageContext.request.locale}"
       scope="session" />
<fmt:setLocale value="${theLocale}" />

<fmt:setBundle basename="com.mycompany.multilingual.i18n.resources.mylabels" />
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <a href="i18n-messages-test.jsp?theLocale=en_US">English  </a>
        <a href="i18n-messages-test.jsp?theLocale=de_DE">German  </a>
        <a href="i18n-messages-test.jsp?theLocale=es_ES">Spanish</a>
        <hr/>
        <fmt:message key="label.greeting" /> <br/> <br/>

        <fmt:message key="label.firstname" /> <i>John</i> <br/>

        <fmt:message key="label.lastname" /> <i>Doe</i> <br/><br/>

        <fmt:message key="label.welcome" /> <br/>

    </body>
</html>

The resources files are located like this: Project

CodePudding user response：

Very likely there is no localized value available for the UI to display, therefore the library tries to show you which key to look for.

Check your browser for the configured (preferred) language.
Check the localization for that name and the key visible in the UI.
Provide a better value, rebuild and restart the system and try again.

CodePudding user response：

Internationalization is done as follows:

1 - Create three file called messages_en.properties, messages_es.properties, messages_de.properties,respectively, under /src/main/resources in your project, add the following lines in it, and save the file:

addProduct.name = Name
addProduct.price = Price
addProduct.description = Description

furthermore, do the same things for other file languages, translated to the corresponding language.

2 - Open your web application context and add

@Bean
public LocaleResolver localeResolver(){
SessionLocaleResolver resolver = new
SessionLocaleResolver();
resolver.setDefaultLocale(new Locale("en"));
return resolver;
}

3- add an interceptor to your web application context to permit control over languages that have been set it

@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new
ProcessingTimeLogInterceptor());
LocaleChangeInterceptor localeChangeInterceptor = new
LocaleChangeInterceptor();
localeChangeInterceptor.setParamName("language");
registry.addInterceptor(localeChangeInterceptor);
}

4- don't forget to add taglib on your jsp page

<%@ taglib uri="http://www.springframework.org/tags" prefix="spring"%>
<a href="?language=en" >English</a>|<a href="?
language=nl" >Dutch</a>
<label>
<spring:message code="put properties that you have defined on your 
application properties">
</label>

finally and last, testing your translation that you've made using lang in your URL localhost:8080/yourproject/index?lang=de, es, or en