vip.efactory.common.i18n.config.I18NLocaleChangeInterceptor Maven / Gradle / Ivy
package vip.efactory.common.i18n.config;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;
import org.springframework.web.servlet.support.RequestContextUtils;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* 默认的LocaleChangeInterceptor只能从请求中获取区域信息，这样是不够的
* 此处继承它，重写相关的方法，实现从header头中和请求中获取区域locale信息
*/
public class I18NLocaleChangeInterceptor extends LocaleChangeInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws ServletException {
// 先从请求头中获取国际化的区域信息
String headerLocale = request.getHeader(getParamName());
String requestLocale = request.getParameter(getParamName());
// 若请求头中没有国际化参数，则从请求中获取，若都没有则为null
String parseLocale = StringUtils.isEmpty(headerLocale) ? (StringUtils.isEmpty(requestLocale) ? null : requestLocale) : headerLocale;
if (parseLocale != null) {
if (checkHttpMethod(request.getMethod())) {
LocaleResolver localeResolver = RequestContextUtils.getLocaleResolver(request);
if (localeResolver == null) {
throw new IllegalStateException(
"No LocaleResolver found: not in a DispatcherServlet request?");
}
try {
localeResolver.setLocale(request, response, parseLocaleValue(parseLocale));
} catch (IllegalArgumentException ex) {
if (isIgnoreInvalidLocale()) {
if (logger.isDebugEnabled()) {
logger.debug("Ignoring invalid locale value [" + parseLocale + "]: " + ex.getMessage());
}
} else {
throw ex;
}
}
}
}
// Proceed in any case.
return true;
}
/**
* 和父类中的方法一样，之所以在此处出现，是因为方法为私有，但是又需要用到.
*/
private boolean checkHttpMethod(String currentMethod) {
String[] configuredMethods = getHttpMethods();
if (ObjectUtils.isEmpty(configuredMethods)) {
return true;
}
for (String configuredMethod : configuredMethods) {
if (configuredMethod.equalsIgnoreCase(currentMethod)) {
return true;
}
}
return false;
}
}