Java Code Examples for org.springframework.web.servlet.LocaleResolver#resolveLocale()

/**
 * 获得国际化信息
 * 
 * @param request
 *            HttpServletRequest
 * @param code
 *            国际化代码
 * @param args
 *            替换参数
 * @return
 * @see org.springframework.context.MessageSource#getMessage(String,
 *      Object[], Locale)
 */
public static String getMessage(HttpServletRequest request, String code,
		Object... args) {
	WebApplicationContext messageSource = RequestContextUtils
			.getWebApplicationContext(request);
	if (messageSource == null) {
		throw new IllegalStateException("WebApplicationContext not found!");
	}
	LocaleResolver localeResolver = RequestContextUtils
			.getLocaleResolver(request);
	Locale locale;
	if (localeResolver != null) {
		locale = localeResolver.resolveLocale(request);
	} else {
		locale = request.getLocale();
	}
	return messageSource.getMessage(code, args, locale);
}
 

/**
 * 获得i18n字符串
 */
public static String getMessage(String code, Object[] args) {
	LocaleResolver localLocaleResolver = (LocaleResolver) SpringContextHolder.getBean(LocaleResolver.class);
	HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
	Locale localLocale = localLocaleResolver.resolveLocale(request);
	return SpringContextHolder.getApplicationContext().getMessage(code, args, localLocale);
}
 

/**
 * 获得i18n字符串
 */
public static String getMessage(String code, Object[] args) {
	LocaleResolver localLocaleResolver = (LocaleResolver) SpringContextHolder.getBean(LocaleResolver.class);
	HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();  
	Locale localLocale = localLocaleResolver.resolveLocale(request);
	return SpringContextHolder.getApplicationContext().getMessage(code, args, localLocale);
}
 

/**
 * This method resolves the language through the request.
 *
 * @param request
 * @return
 */
private ResourceBundle getResourceBundle(ServletRequest request) {
    ResourceBundle resourceBundle = ResourceBundle.getBundle(I18N_FILE_KEY);;
    if (request instanceof HttpServletRequest) {
        LocaleResolver localeResolver = RequestContextUtils.getLocaleResolver((HttpServletRequest) request);

        if (localeResolver != null) {
            // get current locale
            Locale locale = localeResolver.resolveLocale((HttpServletRequest) request);
            resourceBundle = ResourceBundle.getBundle(I18N_FILE_KEY, locale);
        }
    }
    return resourceBundle;
}
 

/**
 * 通过HttpServletRequest创建WebErrors
 * 
 * @param request
 *            从request中获得MessageSource和Locale，如果存在的话。
 */
public WebErrors(HttpServletRequest request) {
	WebApplicationContext webApplicationContext = RequestContextUtils
			.getWebApplicationContext(request);
	if (webApplicationContext != null) {
		LocaleResolver localeResolver = RequestContextUtils
				.getLocaleResolver(request);
		Locale locale;
		if (localeResolver != null) {
			locale = localeResolver.resolveLocale(request);
			this.messageSource = webApplicationContext;
			this.locale = locale;
		}
	}
}
 

@Override
public Optional<Locale> resolveLocale(final HttpServletRequest request) {
    final LocaleResolver localeResolver = (LocaleResolver) request.getAttribute(DispatcherServlet.LOCALE_RESOLVER_ATTRIBUTE);
    if (localeResolver != null) {
        final Locale locale = localeResolver.resolveLocale(request);
        if (locale != null) {
            return Optional.of(locale);
        }
    }

    return Optional.fromNullable(request.getLocale());
}
 

/**
 * Create a new RequestContext for the given request, using the given model attributes for Errors retrieval.
 * <p>This works with all View implementations. It will typically be used by View implementations.
 * <p>If a ServletContext is specified, the RequestContext will also work with a root
 * WebApplicationContext (outside a DispatcherServlet).
 * @param request current HTTP request
 * @param response current HTTP response
 * @param servletContext the servlet context of the web application (can be {@code null}; necessary for
 * fallback to root WebApplicationContext)
 * @param model the model attributes for the current view (can be {@code null}, using the request attributes
 * for Errors retrieval)
 * @see org.springframework.web.context.WebApplicationContext
 * @see org.springframework.web.servlet.DispatcherServlet
 */
public RequestContext(HttpServletRequest request, @Nullable HttpServletResponse response,
		@Nullable ServletContext servletContext, @Nullable Map<String, Object> model) {

	this.request = request;
	this.response = response;
	this.model = model;

	// Fetch WebApplicationContext, either from DispatcherServlet or the root context.
	// ServletContext needs to be specified to be able to fall back to the root context!
	WebApplicationContext wac = (WebApplicationContext) request.getAttribute(WEB_APPLICATION_CONTEXT_ATTRIBUTE);
	if (wac == null) {
		wac = RequestContextUtils.findWebApplicationContext(request, servletContext);
		if (wac == null) {
			throw new IllegalStateException("No WebApplicationContext found: not in a DispatcherServlet " +
					"request and no ContextLoaderListener registered?");
		}
	}
	this.webApplicationContext = wac;

	Locale locale = null;
	TimeZone timeZone = null;

	// Determine locale to use for this RequestContext.
	LocaleResolver localeResolver = RequestContextUtils.getLocaleResolver(request);
	if (localeResolver instanceof LocaleContextResolver) {
		LocaleContext localeContext = ((LocaleContextResolver) localeResolver).resolveLocaleContext(request);
		locale = localeContext.getLocale();
		if (localeContext instanceof TimeZoneAwareLocaleContext) {
			timeZone = ((TimeZoneAwareLocaleContext) localeContext).getTimeZone();
		}
	}
	else if (localeResolver != null) {
		// Try LocaleResolver (we're within a DispatcherServlet request).
		locale = localeResolver.resolveLocale(request);
	}

	this.locale = locale;
	this.timeZone = timeZone;

	// Determine default HTML escape setting from the "defaultHtmlEscape"
	// context-param in web.xml, if any.
	this.defaultHtmlEscape = WebUtils.getDefaultHtmlEscape(this.webApplicationContext.getServletContext());

	// Determine response-encoded HTML escape setting from the "responseEncodedHtmlEscape"
	// context-param in web.xml, if any.
	this.responseEncodedHtmlEscape =
			WebUtils.getResponseEncodedHtmlEscape(this.webApplicationContext.getServletContext());

	this.urlPathHelper = new UrlPathHelper();

	if (this.webApplicationContext.containsBean(RequestContextUtils.REQUEST_DATA_VALUE_PROCESSOR_BEAN_NAME)) {
		this.requestDataValueProcessor = this.webApplicationContext.getBean(
				RequestContextUtils.REQUEST_DATA_VALUE_PROCESSOR_BEAN_NAME, RequestDataValueProcessor.class);
	}
}
 

public static String getMessage(String code, Object... args) {
    LocaleResolver localeResolver = getBean(LocaleResolver.class);
    Locale locale = localeResolver.resolveLocale(getCurrentReq());
    return applicationContext.getMessage(code, args, locale);
}
 

/**
 * Create a new RequestContext for the given request, using the given model attributes for Errors retrieval.
 * <p>This works with all View implementations. It will typically be used by View implementations.
 * <p>If a ServletContext is specified, the RequestContext will also work with a root
 * WebApplicationContext (outside a DispatcherServlet).
 * @param request current HTTP request
 * @param response current HTTP response
 * @param servletContext the servlet context of the web application (can be {@code null}; necessary for
 * fallback to root WebApplicationContext)
 * @param model the model attributes for the current view (can be {@code null}, using the request attributes
 * for Errors retrieval)
 * @see org.springframework.web.context.WebApplicationContext
 * @see org.springframework.web.servlet.DispatcherServlet
 */
public RequestContext(HttpServletRequest request, @Nullable HttpServletResponse response,
		@Nullable ServletContext servletContext, @Nullable Map<String, Object> model) {

	this.request = request;
	this.response = response;
	this.model = model;

	// Fetch WebApplicationContext, either from DispatcherServlet or the root context.
	// ServletContext needs to be specified to be able to fall back to the root context!
	WebApplicationContext wac = (WebApplicationContext) request.getAttribute(WEB_APPLICATION_CONTEXT_ATTRIBUTE);
	if (wac == null) {
		wac = RequestContextUtils.findWebApplicationContext(request, servletContext);
		if (wac == null) {
			throw new IllegalStateException("No WebApplicationContext found: not in a DispatcherServlet " +
					"request and no ContextLoaderListener registered?");
		}
	}
	this.webApplicationContext = wac;

	Locale locale = null;
	TimeZone timeZone = null;

	// Determine locale to use for this RequestContext.
	LocaleResolver localeResolver = RequestContextUtils.getLocaleResolver(request);
	if (localeResolver instanceof LocaleContextResolver) {
		LocaleContext localeContext = ((LocaleContextResolver) localeResolver).resolveLocaleContext(request);
		locale = localeContext.getLocale();
		if (localeContext instanceof TimeZoneAwareLocaleContext) {
			timeZone = ((TimeZoneAwareLocaleContext) localeContext).getTimeZone();
		}
	}
	else if (localeResolver != null) {
		// Try LocaleResolver (we're within a DispatcherServlet request).
		locale = localeResolver.resolveLocale(request);
	}

	this.locale = locale;
	this.timeZone = timeZone;

	// Determine default HTML escape setting from the "defaultHtmlEscape"
	// context-param in web.xml, if any.
	this.defaultHtmlEscape = WebUtils.getDefaultHtmlEscape(this.webApplicationContext.getServletContext());

	// Determine response-encoded HTML escape setting from the "responseEncodedHtmlEscape"
	// context-param in web.xml, if any.
	this.responseEncodedHtmlEscape =
			WebUtils.getResponseEncodedHtmlEscape(this.webApplicationContext.getServletContext());

	this.urlPathHelper = new UrlPathHelper();

	if (this.webApplicationContext.containsBean(RequestContextUtils.REQUEST_DATA_VALUE_PROCESSOR_BEAN_NAME)) {
		this.requestDataValueProcessor = this.webApplicationContext.getBean(
				RequestContextUtils.REQUEST_DATA_VALUE_PROCESSOR_BEAN_NAME, RequestDataValueProcessor.class);
	}
}
 

/**
 * Initialize this context with the given request, using the given model attributes for Errors retrieval.
 * <p>Delegates to {@code getFallbackLocale} and {@code getFallbackTheme} for determining the fallback
 * locale and theme, respectively, if no LocaleResolver and/or ThemeResolver can be found in the request.
 * @param request current HTTP request
 * @param servletContext the servlet context of the web application (can be {@code null}; necessary for
 * fallback to root WebApplicationContext)
 * @param model the model attributes for the current view (can be {@code null}, using the request attributes
 * for Errors retrieval)
 * @see #getFallbackLocale
 * @see #getFallbackTheme
 * @see org.springframework.web.servlet.DispatcherServlet#LOCALE_RESOLVER_ATTRIBUTE
 * @see org.springframework.web.servlet.DispatcherServlet#THEME_RESOLVER_ATTRIBUTE
 */
protected void initContext(HttpServletRequest request, HttpServletResponse response, ServletContext servletContext,
		Map<String, Object> model) {

	this.request = request;
	this.response = response;
	this.model = model;

	// Fetch WebApplicationContext, either from DispatcherServlet or the root context.
	// ServletContext needs to be specified to be able to fall back to the root context!
	this.webApplicationContext = (WebApplicationContext) request.getAttribute(WEB_APPLICATION_CONTEXT_ATTRIBUTE);
	if (this.webApplicationContext == null) {
		this.webApplicationContext = RequestContextUtils.findWebApplicationContext(request, servletContext);
		if (this.webApplicationContext == null) {
			throw new IllegalStateException("No WebApplicationContext found: not in a DispatcherServlet " +
					"request and no ContextLoaderListener registered?");
		}
	}

	// Determine locale to use for this RequestContext.
	LocaleResolver localeResolver = RequestContextUtils.getLocaleResolver(request);
	if (localeResolver instanceof LocaleContextResolver) {
		LocaleContext localeContext = ((LocaleContextResolver) localeResolver).resolveLocaleContext(request);
		this.locale = localeContext.getLocale();
		if (localeContext instanceof TimeZoneAwareLocaleContext) {
			this.timeZone = ((TimeZoneAwareLocaleContext) localeContext).getTimeZone();
		}
	}
	else if (localeResolver != null) {
		// Try LocaleResolver (we're within a DispatcherServlet request).
		this.locale = localeResolver.resolveLocale(request);
	}

	// Try JSTL fallbacks if necessary.
	if (this.locale == null) {
		this.locale = getFallbackLocale();
	}
	if (this.timeZone == null) {
		this.timeZone = getFallbackTimeZone();
	}

	// Determine default HTML escape setting from the "defaultHtmlEscape"
	// context-param in web.xml, if any.
	this.defaultHtmlEscape = WebUtils.getDefaultHtmlEscape(this.webApplicationContext.getServletContext());

	// Determine response-encoded HTML escape setting from the "responseEncodedHtmlEscape"
	// context-param in web.xml, if any.
	this.responseEncodedHtmlEscape = WebUtils.getResponseEncodedHtmlEscape(this.webApplicationContext.getServletContext());

	this.urlPathHelper = new UrlPathHelper();

	if (this.webApplicationContext.containsBean(RequestContextUtils.REQUEST_DATA_VALUE_PROCESSOR_BEAN_NAME)) {
		this.requestDataValueProcessor = this.webApplicationContext.getBean(
				RequestContextUtils.REQUEST_DATA_VALUE_PROCESSOR_BEAN_NAME, RequestDataValueProcessor.class);
	}
}
 

/**
 * Initialize this context with the given request, using the given model attributes for Errors retrieval.
 * <p>Delegates to {@code getFallbackLocale} and {@code getFallbackTheme} for determining the fallback
 * locale and theme, respectively, if no LocaleResolver and/or ThemeResolver can be found in the request.
 * @param request current HTTP request
 * @param servletContext the servlet context of the web application (can be {@code null}; necessary for
 * fallback to root WebApplicationContext)
 * @param model the model attributes for the current view (can be {@code null}, using the request attributes
 * for Errors retrieval)
 * @see #getFallbackLocale
 * @see #getFallbackTheme
 * @see org.springframework.web.servlet.DispatcherServlet#LOCALE_RESOLVER_ATTRIBUTE
 * @see org.springframework.web.servlet.DispatcherServlet#THEME_RESOLVER_ATTRIBUTE
 */
protected void initContext(HttpServletRequest request, HttpServletResponse response, ServletContext servletContext,
		Map<String, Object> model) {

	this.request = request;
	this.response = response;
	this.model = model;

	// Fetch WebApplicationContext, either from DispatcherServlet or the root context.
	// ServletContext needs to be specified to be able to fall back to the root context!
	this.webApplicationContext = (WebApplicationContext) request.getAttribute(WEB_APPLICATION_CONTEXT_ATTRIBUTE);
	if (this.webApplicationContext == null) {
		this.webApplicationContext = RequestContextUtils.findWebApplicationContext(request, servletContext);
		if (this.webApplicationContext == null) {
			throw new IllegalStateException("No WebApplicationContext found: not in a DispatcherServlet " +
					"request and no ContextLoaderListener registered?");
		}
	}

	// Determine locale to use for this RequestContext.
	LocaleResolver localeResolver = RequestContextUtils.getLocaleResolver(request);
	if (localeResolver instanceof LocaleContextResolver) {
		LocaleContext localeContext = ((LocaleContextResolver) localeResolver).resolveLocaleContext(request);
		this.locale = localeContext.getLocale();
		if (localeContext instanceof TimeZoneAwareLocaleContext) {
			this.timeZone = ((TimeZoneAwareLocaleContext) localeContext).getTimeZone();
		}
	}
	else if (localeResolver != null) {
		// Try LocaleResolver (we're within a DispatcherServlet request).
		this.locale = localeResolver.resolveLocale(request);
	}

	// Try JSTL fallbacks if necessary.
	if (this.locale == null) {
		this.locale = getFallbackLocale();
	}
	if (this.timeZone == null) {
		this.timeZone = getFallbackTimeZone();
	}

	// Determine default HTML escape setting from the "defaultHtmlEscape"
	// context-param in web.xml, if any.
	this.defaultHtmlEscape = WebUtils.getDefaultHtmlEscape(this.webApplicationContext.getServletContext());

	// Determine response-encoded HTML escape setting from the "responseEncodedHtmlEscape"
	// context-param in web.xml, if any.
	this.responseEncodedHtmlEscape = WebUtils.getResponseEncodedHtmlEscape(this.webApplicationContext.getServletContext());

	this.urlPathHelper = new UrlPathHelper();

	if (this.webApplicationContext.containsBean(RequestContextUtils.REQUEST_DATA_VALUE_PROCESSOR_BEAN_NAME)) {
		this.requestDataValueProcessor = this.webApplicationContext.getBean(
				RequestContextUtils.REQUEST_DATA_VALUE_PROCESSOR_BEAN_NAME, RequestDataValueProcessor.class);
	}
}
 

/**
 * Retrieve the current locale from the given request, using the
 * LocaleResolver bound to the request by the DispatcherServlet
 * (if available), falling back to the request's accept-header Locale.
 * <p>This method serves as a straightforward alternative to the standard
 * Servlet {@link javax.servlet.http.HttpServletRequest#getLocale()} method,
 * falling back to the latter if no more specific locale has been found.
 * <p>Consider using {@link org.springframework.context.i18n.LocaleContextHolder#getLocale()}
 * which will normally be populated with the same Locale.
 * @param request current HTTP request
 * @return the current locale for the given request, either from the
 * LocaleResolver or from the plain request itself
 * @see #getLocaleResolver
 * @see org.springframework.context.i18n.LocaleContextHolder#getLocale()
 */
public static Locale getLocale(HttpServletRequest request) {
	LocaleResolver localeResolver = getLocaleResolver(request);
	return (localeResolver != null ? localeResolver.resolveLocale(request) : request.getLocale());
}
 

/**
 * Retrieve the current locale from the given request, using the
 * LocaleResolver bound to the request by the DispatcherServlet
 * (if available), falling back to the request's accept-header Locale.
 * <p>This method serves as a straightforward alternative to the standard
 * Servlet {@link javax.servlet.http.HttpServletRequest#getLocale()} method,
 * falling back to the latter if no more specific locale has been found.
 * <p>Consider using {@link org.springframework.context.i18n.LocaleContextHolder#getLocale()}
 * which will normally be populated with the same Locale.
 * @param request current HTTP request
 * @return the current locale for the given request, either from the
 * LocaleResolver or from the plain request itself
 * @see #getLocaleResolver
 * @see org.springframework.context.i18n.LocaleContextHolder#getLocale()
 */
public static Locale getLocale(HttpServletRequest request) {
	LocaleResolver localeResolver = getLocaleResolver(request);
	return (localeResolver != null ? localeResolver.resolveLocale(request) : request.getLocale());
}
 

/**
 * Retrieve the current locale from the given request, using the
 * LocaleResolver bound to the request by the DispatcherServlet
 * (if available), falling back to the request's accept-header Locale.
 * <p>This method serves as a straightforward alternative to the standard
 * Servlet {@link javax.servlet.http.HttpServletRequest#getLocale()} method,
 * falling back to the latter if no more specific locale has been found.
 * <p>Consider using {@link org.springframework.context.i18n.LocaleContextHolder#getLocale()}
 * which will normally be populated with the same Locale.
 * @param request current HTTP request
 * @return the current locale for the given request, either from the
 * LocaleResolver or from the plain request itself
 * @see #getLocaleResolver
 * @see org.springframework.context.i18n.LocaleContextHolder#getLocale()
 */
public static Locale getLocale(HttpServletRequest request) {
	LocaleResolver localeResolver = getLocaleResolver(request);
	return (localeResolver != null ? localeResolver.resolveLocale(request) : request.getLocale());
}
 

/**
 * Retrieve the current locale from the given request, using the
 * LocaleResolver bound to the request by the DispatcherServlet
 * (if available), falling back to the request's accept-header Locale.
 * <p>This method serves as a straightforward alternative to the standard
 * Servlet {@link javax.servlet.http.HttpServletRequest#getLocale()} method,
 * falling back to the latter if no more specific locale has been found.
 * <p>Consider using {@link org.springframework.context.i18n.LocaleContextHolder#getLocale()}
 * which will normally be populated with the same Locale.
 * @param request current HTTP request
 * @return the current locale for the given request, either from the
 * LocaleResolver or from the plain request itself
 * @see #getLocaleResolver
 * @see org.springframework.context.i18n.LocaleContextHolder#getLocale()
 */
public static Locale getLocale(HttpServletRequest request) {
	LocaleResolver localeResolver = getLocaleResolver(request);
	return (localeResolver != null ? localeResolver.resolveLocale(request) : request.getLocale());
}