在Spring Boot中使用:org.springframework.context.NoSuchMessageException

welcome.message=Welcome to our application!

welcome.message=欢迎使用我们的应用程序！

import org.springframework.context.MessageSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ResourceBundleMessageSource;

@Configuration
public class MessageConfig {

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.MessageSource;
import org.springframework.stereotype.Service;

import java.util.Locale;

@Service
public class MessageService {

    @Autowired
    private MessageSource messageSource;

    public String getWelcomeMessage(Locale locale) {
        try {
            return messageSource.getMessage("welcome.message", null, locale);
        } catch (Exception e) {
            return "Message not found";
        }
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RestController;

import java.util.Locale;

@RestController
public class WelcomeController {

    @Autowired
    private MessageService messageService;

    @GetMapping("/welcome")
    public String welcome(@RequestHeader(name = "Accept-Language", required = false) Locale locale) {
        if (locale == null) {
            locale = Locale.getDefault();
        }
        return messageService.getWelcomeMessage(locale);
    }
}