springboot+thymeleaf国际化之LocaleResolver接口的示例
作者:幽魂步
springboot中大部分有默认配置所以开发起项目来非常迅速,仅对需求项做单独配置覆盖即可
spring采用的默认区域解析器是AcceptHeaderLocaleResolver,根据request header中的accept-language值来解析locale,并且是不可变的。
那么想要实现国际化,就要使用SessionLocaleResolver或者CookieLocaleResolver。正如类的名字所示,是按session或cookie中储存的locale值来解析locale。
我就以SessionLocaleResolver举例:
1.建立一个配置类
package com.example.config; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.support.ResourceBundleMessageSource; import org.springframework.web.servlet.LocaleResolver; import org.springframework.web.servlet.i18n.SessionLocaleResolver; /** * Created by wq on 2016/8/15. */ @Configuration public class SpringMVC_config { @Bean(name="localeResolver") public LocaleResolver localeResolverBean() { return new SessionLocaleResolver(); } // @Bean(name="messageSource") // public ResourceBundleMessageSource resourceBundleMessageSource(){ // ResourceBundleMessageSource source=new ResourceBundleMessageSource(); // source.setBasename("messages"); // return source; // } }
注意 name="localeResolver" 是必须的
优先级如下:
session中对应属性(3中有说明)有值则按session来
如果没有但是SessionLocaleResolver设置了默认的locale则按默认值来
// SessionLocaleResolver localeResolver=new SessionLocaleResolver(); // localeResolver.setDefaultLocale(Locale.ENGLISH);
再然后就还是按request header中的accept-language值来
2.建立对应的messages.properties
messages.properties
messages_en.properties
messages_zh_CN.properties
前面注释的代码则可以修改properties的前缀部分,name="messageSource" 同样是必须的
比如 setBasename("msg"); 对应properties则为
msg.properties
msg_en.properties
msg_zh_CN.properties
格式上sys.test=hello、sys.test=你好,应该无需赘述(可能转码会避免一些问题,我这里直接放的中文)
3.controller中切换locale
package com.example.controller; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.LocaleResolver; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import java.util.Locale; import static org.springframework.web.servlet.i18n.SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME; /** * Created by Administrator on 2016/6/11. */ @Controller public class DemoController { @Autowired LocaleResolver localeResolver; @RequestMapping("test") public String test(HttpServletRequest request, HttpServletResponse response) { HttpSession session=request.getSession(); localeResolver.setLocale(request,response,Locale.ENGLISH); System.out.println(session.getAttribute(LOCALE_SESSION_ATTRIBUTE_NAME)); return "messages"; } }
这里org.springframework.web.servlet.i18n.SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME这个字符串常量则是session中默认属性名
可以看一下SessionLocaleResolver的部分源码
public class SessionLocaleResolver extends AbstractLocaleContextResolver { public static final String LOCALE_SESSION_ATTRIBUTE_NAME = SessionLocaleResolver.class.getName() + ".LOCALE"; public static final String TIME_ZONE_SESSION_ATTRIBUTE_NAME = SessionLocaleResolver.class.getName() + ".TIME_ZONE";
locale默认属性名为
org.springframework.web.servlet.i18n.SessionLocaleResolver.LOCALE
setLocale是抽象类AbstractLocaleContextResolver中方法
public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) { this.setLocaleContext(request, response, locale != null?new SimpleLocaleContext(locale):null); }
然后看SessionLocaleResolver中setLocaleContext
public void setLocaleContext(HttpServletRequest request, HttpServletResponse response, LocaleContext localeContext) { Locale locale = null; TimeZone timeZone = null; if(localeContext != null) { locale = localeContext.getLocale(); if(localeContext instanceof TimeZoneAwareLocaleContext) { timeZone = ((TimeZoneAwareLocaleContext)localeContext).getTimeZone(); } } WebUtils.setSessionAttribute(request, LOCALE_SESSION_ATTRIBUTE_NAME, locale); WebUtils.setSessionAttribute(request, TIME_ZONE_SESSION_ATTRIBUTE_NAME, timeZone); }
本质上就是一些非空判断取默认,最终给session中的对应属性赋值
4.thymeleaf页面中调用
<!DOCTYPE html> <html lang="zh_CN" xmlns:th="http://www.thymeleaf.org"> <head> <title>msg</title> </head> <body> <h1 th:text="${#locale}"></h1> <h1 th:text="#{sys.test}"></h1> </body> </html>
则显示en hello
能用注解的,尽量不用xml,看着xml就烦!!!
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。