Spring Boot 提供了很好的国际化支持，可以轻松地实现中英文国际化。

项目创建，及其springboot系列相关知识点详见：springboot系列

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1 创建properties国际化文件

在 src/main/resources 目录下创建多个属性文件（.properties），每个文件对应一种语言

messages_en_US.properties

# 系统状态码 ============================================================================================================
error.20000=The request is successful.
error.40000=Param error!
error.50000=System error!

messages_zh_CN.properties

# 系统状态码 ============================================================================================================
error.20000=请求成功.
error.40000=参数错误！
error.50000=系统异常！

**注：**demo截图

2 创建异常码(和国际化文件有关联关系)

GlobalError

/*** 系统异常码枚举** @author w30009430* @since 2023 -09-05 12:03*/
public enum GlobalError {// 系统状态码 ====================================================================================================/*** Success ai model error.*/SUCCESS(20000),/*** Param error ai model error.*/PARAM_ERROR(40000),/*** Exception ai model error.*/EXCEPTION(50000);/*** The Code.*/int code;GlobalError(int code) {this.code = code;}/*** Gets code.** @return the code*/public int getCode() {return code;}/*** Gets message.** @return the message*/public String getMessage() {return I18nUtils.getMsgByErrorCode(code);}/*** Gets message with params.** @param supplementMsg the supplement msg* @return the message with params*/public String getMessageWithParams(String supplementMsg) {return I18nUtils.getI18nErrorMsg(code, supplementMsg, CookieUtil.getLanguage());}/*** Gets message en with params.** @param supplementMsg the supplement msg* @return the message en with params*/public String getMessageEnWithParams(String supplementMsg) {return I18nUtils.getI18nErrorMsg(code, supplementMsg, Constants.Other.EN);}/*** Gets message cn with params.** @param supplementMsg the supplement msg* @return the message cn with params*/public String getMessageCnWithParams(String supplementMsg) {return I18nUtils.getI18nErrorMsg(code, supplementMsg, Constants.Other.ZH);}
}

CookieUtil

import org.apache.commons.lang3.StringUtils;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;import java.net.HttpCookie;import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;public class CookieUtil {private static final String ZH = "zh";private static final String EN = "en";private static final String CN = "cn";private static final String US = "us";private static final String ZH_CN = "zh_cn";private static final String LANG = "lang_key";public CookieUtil() {}public static String getLanguage() {return decideLocaleInfoFromCookie("en", "zh");}public static String getCountry() {return decideLocaleInfoFromCookie("us", "cn");}private static String decideLocaleInfoFromCookie(String defaultEnValue, String cnValue) {HttpServletRequest request = getRequest();Cookie[] cookies = null;if (request != null) {cookies = getCookies(request);}if (cookies != null) {Cookie[] var4 = cookies;int var5 = cookies.length;for (int var6 = 0; var6 < var5; ++var6) {Cookie cookie = var4[var6];if ("lang_key".equals(cookie.getName()) && "zh_cn".equals(cookie.getValue())) {return cnValue;}}}return defaultEnValue;}public static Cookie[] getCookies(HttpServletRequest request) {Cookie[] cookies = null;if (request.getCookies() != null) {cookies = request.getCookies();} else {String cookieStr = request.getHeader("cookie");if (StringUtils.isNotBlank(cookieStr)) {cookies = (Cookie[]) HttpCookie.parse(cookieStr).stream().map((httpCookie) -> {return new Cookie(httpCookie.getName(), httpCookie.getValue());}).toArray((x$0) -> {return new Cookie[x$0];});}}return cookies;}public static String getCountryByLanguage(String language) {String country = "us";if ("zh".equals(language)) {country = "cn";}return country;}public static HttpServletRequest getRequest() {HttpServletRequest request = null;RequestAttributes attributes = RequestContextHolder.getRequestAttributes();if (attributes != null && attributes instanceof ServletRequestAttributes) {request = ((ServletRequestAttributes) attributes).getRequest();}return request;}
}

I18nUtils

import lombok.extern.slf4j.Slf4j;import org.apache.commons.lang3.StringUtils;import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;/*** 功能描述** @author w30009430* @since 2023 -09-05 12:03*/
@Slf4j
public class I18nUtils {/*** Gets i 18 n error msg.** @param code          the code* @param supplementMsg the supplement msg* @param language      the language* @return the i 18 n error msg*/public static String getI18nErrorMsg(int code, String supplementMsg, String language) {String key = "error." + code;String message = getMsgByLanguage(key, language);if (StringUtils.isNotEmpty(message)) {message = message + " " + supplementMsg;}return message;}private static String getMsgByLanguage(String key, String language) {String country = getCountryByLanguage(language);ResourceBundle bundle = null;String value = null;ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();return getMsg(key, language, country, value, contextClassLoader);}private static String getMsg(String key, String language, String country, String value, ClassLoader contextClassLoader) {ResourceBundle bundle;try {if (contextClassLoader != null) {bundle = ResourceBundle.getBundle("i18/messages", new Locale(language, country), contextClassLoader);} else {bundle = ResourceBundle.getBundle("i18/message", new Locale(language, country));}if (bundle != null) {value = bundle.getString(key);}} catch (MissingResourceException var8) {log.error("missing resource error !");}return value;}private static String getCountryByLanguage(String language) {String country = "us";if ("zh".equals(language)) {country = "cn";}return country;}public static String getMsgByErrorCode(int code) {ClassLoader classLoader = null;if (code > 10000) {classLoader = Thread.currentThread().getContextClassLoader();}String key = "error." + code;String language = CookieUtil.getLanguage();String country = CookieUtil.getCountry();String value = null;return getMsg(key, language, country, value, classLoader);}
}

3 使用

DemoController

@Api(tags = {"Swagger2测试-demo测试类"})
@RestController
@RequestMapping("/demo")
public class DemoController {@ApiOperation(value = "Hello测试", notes = "无参数测试")@GetMapping("/hello")public RespResult hello() {return RespResult.resultOK("OK");}
}

RespResult

@Data
public class RespResult {/*** The Code.*/int code = RespCodeEnum.SUCCESS.getCode();/*** The Data.*/Object data;/*** The Msg.*/String msg;/*** 处理请求响应正常时方法** @param data 返回的数据* @return RespResult 数据*/public static RespResult resultOK(Object data) {RespResult respResult = new RespResult();respResult.data = data == null ? new HashMap<>() : data;respResult.msg = GlobalError.SUCCESS.getMessage();return respResult;}/*** 处理请求异常时方法** @param code 状态码* @param msg  异常信息* @param data 数据* @return RespResult data*/public static RespResult resultFail(int code, String msg, Object data) {RespResult respResult = new RespResult();respResult.code = code;respResult.msg = msg;respResult.data = data;return respResult;}/*** 处理请求异常时方法** @param code 状态码* @param msg  异常信息* @return RespResult data*/public static RespResult resultFail(int code, String msg) {RespResult respResult = new RespResult();respResult.data = new HashMap<>();respResult.code = code;respResult.msg = msg;return respResult;}
}

RespCodeEnum

public enum RespCodeEnum {SUCCESS(200, "The request is successful.", "请求成功."),EXP(500, "System error! ", "系统异常！");private Integer code;private String descEn;private String descCn;RespCodeEnum(final int code, final String descEn, final String descCn) {this.code = code;this.descEn = descEn;this.descCn = descCn;}/*** <设置code值>** @return Integer 数据*/public Integer getCode() {return code;}/*** <获取导入校验枚举描述>** @return Integer 数据*/public String getDescEn() {return descEn;}/*** <获取导入校验枚举描述>** @return Integer 数据*/public String getDescCn() {return descCn;}
}

4 测试效果

中文：

英文-默认：