SpringBoot实现国际化(多语言)配置的详细步骤

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spring:
  messages:
    basename: i18n/messages
    encoding: utf-8

import org.springframework.util.StringUtils;
import org.springframework.web.servlet.LocaleResolver;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Locale;

/**
 * 国际化参数解析器
 *
 * @author qf
 * @date 2025-05-08 20:58:18
 */
public class HeaderLocalResolver implements LocaleResolver {
    private static final String ACCEPT_LANGUAGE = "lang";

    /**
     * 国际化参数解析方法
     */
    @Override
    public Locale resolveLocale(HttpServletRequest httpServletRequest) {
        Locale locale = Locale.getDefault();
        String acceptLanguageHeader = httpServletRequest.getHeader(ACCEPT_LANGUAGE);
        if (StringUtils.isEmpty(acceptLanguageHeader)) {
            //前端未传lang请求头 默认使用简体中文
            String[] params = LanguageEnum.CN.getLang().split("-");
            return new Locale(params[0], params[1]);
        }
        String lang = acceptLanguageHeader.split(";")[0];
        String[] params = lang.split("-");
        if (params.length == 1) {
            return locale;
        }
        locale = new Locale(params[0], params[1]);
        return locale;
    }

    @Override
    public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {
    }
}

/**
 * 多语言枚举
 * @author qf
 * @date 2025-05-08 20:58:18
 */
public enum LanguageEnum {
    // 简体中文
    CN("zh-CN"),
    //繁体中文
    TW("zh-TW"),
    //英文
    US("en-US");

    private String lang;
    LanguageEnum(String lang) {
        this.lang = lang;
    }


    public String getLang(){
        return this.lang;
    }
}

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ResourceBundleMessageSource;
import org.springframework.web.servlet.LocaleResolver;

/**
 * 国际化配置类
 * @author qf
 * @date 2025-05-08 20:58:18
 */
@Configuration
public class I18nConfig {
    @Value("${spring.messages.basename:i18n.messages}")
    private String baseName;
    @Value("${spring.messages.encoding:UTF-8}")
    private String encoding;

    /**
     * 注入文本解析
     */
    @Bean(name = "messageSource")
    public ResourceBundleMessageSource getMessageResource() {
        ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
        messageSource.setBasename(baseName);
        messageSource.setDefaultEncoding(encoding);
        return messageSource;
    }

    /**
     * 注入自定义国际化解析器
     */
    @Bean(name = "localeResolver")
    public LocaleResolver localeResolver(){
        return new HeaderLocalResolver();
    }
}

@RestController
@RequestMapping("api")
public class TestController {
    /**
     * 通过code拿多语言下的内容
     * @param code
     * @return
     */
    @GetMapping("/test")
    public String test(String code) {
        String message = LanguageUtil.get(code);
        return message;
    }
}