将 message.properties 暴露给 javascript？

Question

有没有一种简单的方法可以将所有已翻译的字符串公开给 javascript？我希望能够在我的 JS 文件中使用翻译后的字符串，而无需在 GSP 中手动构建它们。

有没有简单的方法可以做到这一点？

Answer 1

Jawr 插件（用于优化 JS 和 CSS 资源的好插件）可以将部分或全部 i18n 消息包暴露给 Javascript：

http://jawr.java.net/docs/messages_gen.html

Answer 2

将i18n/messages.properties 公开为JSON

I18nController.groovy

​​>

package myproject

import grails.converters.JSON
import grails.plugin.springsecurity.annotation.Secured

@Secured("permitAll")
class I18nController {
  static defaultAction = "index"

  I18nService i18nService

  def index() {
    render i18nService.getAllTranslations(params, request) as JSON
  }
}

I18nService.groovy

​​>

package myproject

import grails.transaction.Transactional
import grails.web.servlet.mvc.GrailsParameterMap
import org.springframework.context.MessageSource

import javax.servlet.http.HttpServletRequest

@Transactional
class I18nService {

  MessageSource messageSource
  LocaleService localeService

  /**
   * http://www.razum.si/blog/grails-javascript-i18n-messages
   * @return
   */
  Properties getAllTranslations(GrailsParameterMap params, HttpServletRequest request) {
    Locale locale = localeService.prepareLocale(params, request)
    Properties keys = messageSource.withTraits(MessagePropertiesTrait).getMessageKeys(locale)

    //def jsKeys = keys.findAll { code, value -> ((String) code).startsWith('js.') }
    //render jsKeys as JSON

    return keys
  }
}

LocaleService.groovy

​​>

package myproject

import grails.transaction.Transactional
import grails.web.servlet.mvc.GrailsParameterMap
import org.springframework.web.servlet.support.RequestContextUtils

import javax.servlet.http.HttpServletRequest

@Transactional
class LocaleService {

  public static final String DEFAULT_LANG = 'es'
  public static final String PARAM_LANG_KEY = 'langKey'
  public static final String COOKIE_LANG_KEY = 'language'

  Locale prepareLocale(GrailsParameterMap params, HttpServletRequest request) {
    Locale locale = null
    int i = 0

    List<String> langStrings = new ArrayList<>()
    langStrings.add(params.get(PARAM_LANG_KEY) as String)
    langStrings.add(request.cookies.find { COOKIE_LANG_KEY == it.name }?.value)

    while ((locale == null) && (i < langStrings.size())) {
      String str = langStrings.get(i)
      if (str) {
        try {
          locale = new Locale(str)
        } catch (Exception ex) {
          ex.printStackTrace()
        }
      }

      i++
    }

    if (locale == null) {
      try {
        // From Request
        locale = RequestContextUtils.getLocale(request)
      } catch (Exception e) {
        // Default
        locale = new Locale(DEFAULT_LANG)
      }
    }

    return locale
  }
}

Helpers.groovy

​​>

在utils/myproject创建这个文件：

package myproject

import groovy.transform.CompileStatic
import groovy.transform.TypeCheckingMode

@CompileStatic(TypeCheckingMode.SKIP)
trait MessagePropertiesTrait {
  Properties getMessageKeys(Locale locale) {
    this.getMergedProperties(locale).properties
  }

  Properties getPluginMessageKeys(Locale locale) {
    this.getMergedPluginProperties(locale).properties
  }
}

UrlMappings.groovy

​​>

添加跟随 URL 映射：

"/i18n/$langKey?(.$format)?"(controller: 'i18n', action: 'index')

用法

网址

http://localhost:8080/i18n # Default language
http://localhost:8080/i18n/.json # Default language

http://localhost:8080/i18n/en.json
http://localhost:8080/i18n/en

http://localhost:8080/i18n/es.json
http://localhost:8080/i18n/es

Cookie

使用语言 (es, en, ...) 设置名为 language 的 Cookie 并调用 http://localhost:8080/i18n 或 http://localhost:8080/i18n/.json