Spring Boot 国际化解析

Question

I have problems with the resolution of i18n in my spring boot application . I have this configuration:

LocaleConfiguration.java Here I set Locale.US like default language, set the message directory to "src/main/resources/messages" and use locale param to change the language.

package com.myproject.web.config;

import java.util.Locale;

import org.springframework.context.MessageSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ReloadableResourceBundleMessageSource;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;
import org.springframework.web.servlet.i18n.SessionLocaleResolver;

@Configuration
public class LocaleConfiguration extends WebMvcConfigurerAdapter {

    /**
     * Este bean se encargará de resolver que idioma (locale) esta siendo usado
     * actualmente
     * 
     * @return
     */
    @Bean
    public LocaleResolver localeResolver() {
        SessionLocaleResolver slr = new SessionLocaleResolver();
        slr.setDefaultLocale(Locale.US);
        return slr;
    }

    /**
     * Este bean se encargara de interceptar el locale que venga a través del
     * parámetro locale de la url
     * 
     * @return
     */
    @Bean
    public LocaleChangeInterceptor localeChangeInterceptor() {
        LocaleChangeInterceptor lci = new LocaleChangeInterceptor();
        lci.setParamName("locale");
        return lci;
    }

    @Bean
    public MessageSource messageSource() {
        ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
        messageSource.setBasename("classpath:/messages");
        messageSource.setDefaultEncoding("UTF-8");
        return messageSource;
    }

    /**
     * Registramos los filtros
     * 
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(localeChangeInterceptor());
    }

}

My messages files:

/src/main/resources/
----/messages/
-------->messages_es_ES.properties (Spanish message file)
-------->messages.properties (Default messages file. US)

Whey I enter in my home, my app shows:

??home.welcome_en_US??

Looks like can't resolve message files (not even default file.). I should missed something but I can't find? Any help with this?

Solution

---

Problem here was the Basename path that I use, I have to define the full path in the classpath without the locale suffix and the file extension (For my use, this):

@Bean
    public MessageSource messageSource() {
        ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
        messageSource.setBasename("classpath:messages/messages");
        messageSource.setDefaultEncoding("UTF-8");
        return messageSource;
    }

This will search in /src/main/resources/ --> classpath messages/messages --> basename And then add the required suffix ("es_ES", "en_US"..) and the file extension ".properties"

Answer 1

For any similar problem, This was the solution

Problem here was the Basename path that I use, I have to define the full path in the classpath without the locale suffix and the file extension (For my use, this):

@Bean
    public MessageSource messageSource() {
        ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
        messageSource.setBasename("classpath:messages/messages");
        messageSource.setDefaultEncoding("UTF-8");
        return messageSource;
    }

This will search in

/src/main/resources/ --> classpath

messages/messages --> basename

And then add the required suffix ("es_ES", "en_US"..)

and the file extension ".properties"

Answer 2

Another way to have it working in a flexible manner is using the properties initialization file: application.properties with the following entry:

spring.messages.basename=messages/messages

Where the first messages is the name of the folder inside src\resources. Other example, for eventual clarification, is a directory called bundles inside src\resources, like this:

spring.messages.basename=bundles/messages

Using that configuration you don't need the hard coded configuration below in your Springboot main class:

...
messageSource.setBasename("classpath:messages/messages");
...