springboot i18n国际化后台多种语言设置的方式
之前有做过手机端后台的国际化，因为手机统一传递了language参数，所以只要设置LocaleChangeInterceptor就行了
/**
* 配置国际化语言
*/
@Configuration
public class LocaleConfig extends WebMvcConfigurerAdapter{
/**
* 默认解析器 其中locale表示默认语言
*/
@Bean
public LocaleResolver localeResolver() {
SessionLocaleResolver localeResolver = new SessionLocaleResolver();
localeResolver.setDefaultLocale(Locale.CHINA);
return localeResolver;
}
//springboot1.5
@Override
public void addInterceptors(InterceptorRegistry registry) {
LocaleChangeInterceptor localeInterceptor = new LocaleChangeInterceptor();
localeInterceptor.setParamName("language");
registry.addInterceptor(localeInterceptor);
}
}对于某些特殊的后台运行代码，比如定时器，我则使用getByLanguage方法
/**
* 国际化工具类
*/
@Component
public class MessageUtils{
private static MessageSource messageSource;
static SysErrorLogDao sysErrorLogDao;
@Resource
public void setSysErrorLogDao(SysErrorLogDao sysErrorLogDao) {
MessageUtils.sysErrorLogDao = sysErrorLogDao;
}
private static Logger logger = LoggerFactory.getLogger(MessageUtils.class);
public MessageUtils(MessageSource messageSource) {
MessageUtils.messageSource = messageSource;
}
/**
* 获取单个国际化翻译值
* @param msgKey
* @param defaultMsg
* @return
*/
public static String get(String msgKey, String defaultMsg) {
try {
return messageSource.getMessage(msgKey, null, LocaleContextHolder.getLocale());
} catch (Exception e) {
logger.error(e.getMessage(), e);
String message = StringUtils.getExceptionStackTraceMessage(e);
if(message != null && message.length() > 1000) {
message = message.substring(0, 999);
}
SysErrorLogModel errorLog = new SysErrorLogModel();
errorLog.setContent(msgKey);
errorLog.setType("messageUtils");
errorLog.setCreateDate(new Date());
errorLog.setClassName(MessageUtils.class.getName());
errorLog.setMessage(message);
sysErrorLogDao.save(errorLog);
return defaultMsg;
}
}
/**
* 获取多个参数取代的国际化翻译值
* @param msgKey
* @param defaultMsg
* @param arg
* @return
*/
public static String get(String msgKey, String defaultMsg, Object... arg) {
try {
msgKey = messageSource.getMessage(msgKey, arg, LocaleContextHolder.getLocale());
return msgKey;
} catch (Exception e) {
logger.error(e.getMessage(), e);
String message = StringUtils.getExceptionStackTraceMessage(e);
if(message != null && message.length() > 1000) {
message = message.substring(0, 999);
}
SysErrorLogModel errorLog = new SysErrorLogModel();
errorLog.setContent(msgKey);
errorLog.setType("messageUtils");
errorLog.setCreateDate(new Date());
errorLog.setClassName(MessageUtils.class.getName());
errorLog.setMessage(message);
sysErrorLogDao.save(errorLog);
return MessageFormat.format(defaultMsg, arg);
}
}
/**
* 指定语言获得单个国际化翻译值
* @param msgKey
* @param defaultMsg
* @param language
* @return
*/
public static String getByLanguage(String msgKey, String defaultMsg, String language) {
try {
Locale locale = new Locale(language);
msgKey = messageSource.getMessage(msgKey, null, locale);
return msgKey;
} catch (Exception e) {
logger.error(e.getMessage(), e);
String message = StringUtils.getExceptionStackTraceMessage(e);
if(message != null && message.length() > 1000) {
message = message.substring(0, 999);
}
SysErrorLogModel errorLog = new SysErrorLogModel();
errorLog.setContent(msgKey);
errorLog.setType("messageUtils");
errorLog.setCreateDate(new Date());
errorLog.setClassName(MessageUtils.class.getName());
errorLog.setMessage(message);
sysErrorLogDao.save(errorLog);
return defaultMsg;
}
}
/**
* 指定语言获取多参数取代的国际化翻译值
* @param msgKey
* @param defaultMsg
* @param language
* @param arg
* @return
*/
public static String getByLanguage(String msgKey, String defaultMsg, String language, Object... arg) {
try {
Locale locale = new Locale(language);
msgKey = messageSource.getMessage(msgKey, arg, locale);
return msgKey;
} catch (Exception e) {
logger.error(e.getMessage(), e);
String message = StringUtils.getExceptionStackTraceMessage(e);
if(message != null && message.length() > 1000) {
message = message.substring(0, 999);
}
SysErrorLogModel errorLog = new SysErrorLogModel();
errorLog.setContent(msgKey);
errorLog.setType("messageUtils");
errorLog.setCreateDate(new Date());
errorLog.setClassName(MessageUtils.class.getName());
errorLog.setMessage(message);
sysErrorLogDao.save(errorLog);
return MessageFormat.format(defaultMsg, arg);
}
}
}但是后面又要做网页的国际化，因为网页没有传递统一的语言参数，如果要一一添加的话太过麻烦，于是就要用到cookie来保存传递语言
这个时候就要实现自己的解析器了
public class MyLocaleResolver implements LocaleResolver {
@Override
public Locale resolveLocale(HttpServletRequest httpServletRequest) {
Locale locale = Locale.getDefault();
{
//通过参数解析locale,language参数优先
String temp = httpServletRequest.getParameter("language");
if (!StringUtils.isEmpty(temp)) {
locale = new Locale(temp);
return locale;
}
}
//得到cookie,解析locale
Cookie[] cookies = httpServletRequest.getCookies();
if(cookies != null) {
for (Cookie cookie : cookies) {
if (cookie.getName().equals("userLanguage")) {
String temp = cookie.getValue();
if (!StringUtils.isEmpty(temp)) {
locale = new Locale(temp);
}
continue;
}
}
}
return locale;
}
@Override
public void setLocale(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Locale locale) {
}
}@Configuration
public class LocaleConfig extends WebMvcConfigurerAdapter{
@Bean
public LocaleResolver localeResolver() {
MyLocaleResolver localeResolver = new MyLocaleResolver();
return localeResolver;
}
}这样就实现了使用cookie来设置语言
不过最后还是有所遗漏，因为我们的分布式项目中用到了很多http的内部调用，用不上cookie，也没有language参数。但是大部分的内部调用都有传递公司id，可以通过公司获得公司对应的语言。可以在拦截器里面直接加入对companyId的解析但是我考虑有没有通用的实现方法，就是在任何地方，甚至的运行到一半中途设置语言的办法。初步想法是拿到线程中的Locale进行设置
然后我看了下源码LocaleContextHolder.getLocale()
发现调用的是一个LocaleContext类的方法。
然后查询哪些地方调用了LocaleResolver.resolveLocale
发现第一个方法里面返回了一个匿名函数LocaleContext，其getLocale就是直接调用localeResolver.resolveLocale方法。于是我合理的猜想框架里不是通过拦截器设置一个locale，而是每次调用LocaleContextHolder.getLocale()都会执行localeResolver.resolveLocale(request)方法，所以我们只要设置request属性就行了
public class MyLocaleResolver implements LocaleResolver {
@Override
public Locale resolveLocale(HttpServletRequest httpServletRequest) {
//得到cookie,解析locale
Locale locale = Locale.getDefault();
{
//通过参数解析locale
String temp = httpServletRequest.getParameter("language");
if (!StringUtils.isEmpty(temp)) {
locale = new Locale(temp);
return locale;
}
}
{
String temp = (String) httpServletRequest.getAttribute("language");
if (!StringUtils.isEmpty(temp)) {
locale = new Locale(temp);
return locale;
}
}
Cookie[] cookies = httpServletRequest.getCookies();
if(cookies != null) {
for (Cookie cookie : cookies) {
if (cookie.getName().equals("userLanguage")) {
String temp = cookie.getValue();
if (!StringUtils.isEmpty(temp)) {
locale = new Locale(temp);
}
continue;
}
}
}
return locale;
}
@Override
public void setLocale(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Locale locale) {
}
} @RequestMapping("/test")
public String test(HttpServletRequest request) {
String result = "";
request.setAttribute("language", "ch");
result += MessageUtils.get("test", "测试");
request.setAttribute("language", "en");
result += MessageUtils.get("test", "测试");
return result;
}messages_ch.properties
test=测试messages_en.properties
test=test
这样我们就实现了在任何地点，甚至中途变换语言了
发现LocaleContextHolder.getLocale()在实体类中也可以调用。因此可以后台保存json格式，在get方法中根据语言返回相应的值。我本来想直接改造原来的字段，但是发现缓存会直接读取get中的值，下次读取就不是json了，所以只好麻烦点增加一个字段了
public String getFullNameByLanguage() {
String language = LocaleContextHolder.getLocale().getLanguage();
Map map;
try {
map = JsonUtil.string2Obj(fullName);
return map.get(language);
} catch (IOException e) {
return fullName;
}
} 当使用@Async异步方法时，LocaleContext就是空的。这时候需要强制设置语言LocaleContextHolder.setLocale(Locale locale),当然一般的方法也可以用这个来设置语言，不过这样的话就不会再调用localeResolver.resolveLocale(request)方法了