How SpringBoot implements internationalization with front-end and back-end separation

Preface

Springboot internationalization can help users build applications in different language environments, so that applications can effectively adapt to user needs in different language and cultural backgrounds.

In addition, Springboot internationalization can also facilitate the reuse and maintenance of multi-language applications, thereby reducing the time cost of system deployment and maintenance costs.

To implement Springboot international application, there are three main steps.

1. Set international property files

Define international resource files, use properties format files, put different multi-language text resources in different files, and name each file Use [locale] [messages] method, such as zh_CN.properties, en_US.properties, etc.

The content of the message.properties file can be empty.

message.en_US.properties content example:

40001=Hello

40001=Hello

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;
import org.springframework.web.servlet.i18n.SessionLocaleResolver;

import java.util.Locale;

@Configuration
public class LocaleConfig {

	@Bean
	public SessionLocaleResolver localeResolver() {
		SessionLocaleResolver localeResolver = new SessionLocaleResolver();
		localeResolver.setDefaultLocale(Locale.CHINA);
		return localeResolver;
	}
	
	@Bean
	public WebMvcConfigurer localeInterceptor() {
		return new WebMvcConfigurer() {
			@Override
			public void addInterceptors(InterceptorRegistry registry) {
				LocaleChangeInterceptor localeInterceptor = new LocaleChangeInterceptor();
				localeInterceptor.setParamName("lang");
				registry.addInterceptor(localeInterceptor);
			}
		};
	}
}

Copy after login

#i18n
spring.messages.basename=i18n.messages
spring.messages.cache-duration=3600
spring.messages.encoding=UTF-8

spring: 
  messages:
    basename: i18n/messages

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.MessageSource;
import org.springframework.context.i18n.LocaleContextHolder;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/test")
public class TestControler {

	@Autowired
	private MessageSource messageSource;
	
	@GetMapping("/hello")
	public Map<Object, Object> test() {
		Map<Object, Object> result = new HashMap<Object, Object>();
		result.put("code", 40001);
		result.put("msg", messageSource.getMessage("40001", null, LocaleContextHolder.getLocale()));
		return result;
	}

}

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