SpringBoot消息国际化配置实现过程解析

package com.spring.security.config.spring;

import java.util.Locale;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.i18n.LocaleContext;
import org.springframework.context.support.ResourceBundleMessageSource;
import org.springframework.util.Assert;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.i18n.AbstractLocaleContextResolver;
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;
import org.springframework.web.servlet.i18n.SessionLocaleResolver;

@Configuration
public class MessageConfig extends AbstractLocaleContextResolver{

	@Value("${spring.messages.basename}")
	public String[] basenames;

	@Bean(name = "messageSource")
	public ResourceBundleMessageSource resourceBundleMessageSource() {
		ResourceBundleMessageSource source = new ResourceBundleMessageSource();
		if (basenames != null) {
			for (int i = 0; i < basenames.length; i++) {
				String basename = basenames[i];
				Assert.hasText(basename, "Basename must not be empty");
				this.basenames[i] = basename.trim();
			}
			source.setBasenames(basenames);
		} else {
			this.basenames = new String[0];
			source.setBasename(basenames[0]);
		}
		source.setDefaultEncoding("UTF-8");
		source.setUseCodeAsDefaultMessage(true);
		return source;
	}

  @Bean
  public LocaleResolver localeResolver() {
    SessionLocaleResolver slr = new SessionLocaleResolver();
    slr.setDefaultLocale(Locale.SIMPLIFIED_CHINESE);
    return slr;
  }

  /**
   * 国际化，设置url识别参数
   *
   * @return
   */
  @Bean
  public LocaleChangeInterceptor localeChangeInterceptor() {
    LocaleChangeInterceptor lci = new LocaleChangeInterceptor();
    lci.setParamName("lang");
    return lci;
  }

	@Override
	public LocaleContext resolveLocaleContext(HttpServletRequest request) {
		return null;
	}

	@Override
	public void setLocaleContext(HttpServletRequest request, HttpServletResponse response,
			LocaleContext localeContext) {
	}
}

package com.spring.security.common.utils;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Service;

/**
 * Spring容器
 */
@Service
public class SpringUtils implements ApplicationContextAware {

  private static ApplicationContext context = null;

  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    if (context == null) {
      context = applicationContext;
    }
  }

  /**
   * 获取容器
   *
   * @return 容器
   */
  public static ApplicationContext getContext() {
    return context;
  }
}

package com.spring.security.common.utils;

import java.util.Locale;

import org.springframework.context.i18n.LocaleContextHolder;
import org.springframework.context.support.ReloadableResourceBundleMessageSource;

public class MessageUtils {

	public static String getMessage(String code) {
		 Locale locale = LocaleContextHolder.getLocale();
		 ReloadableResourceBundleMessageSource reloadableResourceBundleMessageSource = new ReloadableResourceBundleMessageSource();
	   String message = reloadableResourceBundleMessageSource.getMessage(code, null, locale);
	   return message;
	}
}

package com.spring.security.config.spring;

import java.nio.charset.Charset;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;

@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {

	@Autowired
	private LocaleChangeInterceptor localeChangeInterceptor;

	/**
	 * 解决跨域
	 */
	@Override
	protected void addCorsMappings(CorsRegistry registry) {
		registry
		.addMapping("/**")
		.allowedHeaders("*")
		.allowedMethods("*")
		.allowedOrigins("*")
		.allowCredentials(true);
	}

	/**
	 * 配置消息转换器
	 * 解决返回String乱码
	 */
	@Override
	protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
		super.configureMessageConverters(converters);
		converters.add(responseBodyConverter());
	}

	@Bean
  public HttpMessageConverter<String> responseBodyConverter() {
    return new StringHttpMessageConverter(Charset.forName("UTF-8"));
  }

	@Override
	protected void addInterceptors(InterceptorRegistry registry) {
		super.addInterceptors(registry);
		registry.addInterceptor(localeChangeInterceptor);
	}

}

package com.spring.security.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import com.spring.security.common.utils.I18nUtils;

@RestController
public class TestController {

	@GetMapping("/test")
	public String doTest() {
		return I18nUtils.getMessage("hello");
	}
}