5.2 Spring MVC的国际化处理 5.2.2 基于Cookie的国际化实现

CookieLocaleResolver不是默认的语言区域解析器,需要显式对其进行配置。使用它,Spring MVC会从Cookie中获取用户所设置的语言区域,来确定使用哪个语言区域.

实例基于Cookie的国际化实现

springmvc-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
		http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.3.xsd">
    <!-- spring可以自动去扫描base-pack下面的包或者子包下面的java文件，
        如果扫描到有Spring的相关注解的类，则把这些类注册为Spring的bean -->
    <context:component-scan base-package="org.fkit"/>
    <!-- 默认配置方案 -->
    <mvc:annotation-driven/>
    <!-- 静态资源处理 -->
    <mvc:default-servlet-handler/>
    <!-- 视图解析器 p:prefix属性表示前缀 p:suffix 表示后缀 -->
    <bean
        id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver"
        p:prefix="/WEB-INF/content/"
        p:suffix=".jsp"/>
    <!-- 国际化 -->
    <bean
        id="messageSource"
        class="org.springframework.context.support.ResourceBundleMessageSource"
        p:basenames="message"
        p:defaultEncoding="utf-8">
    </bean>
    <mvc:interceptors>
        <!-- 国际化操作拦截器 如果采用基于（请求/Session/Cookie）则必需配置 -->
        <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor"/>
    </mvc:interceptors>
    <bean
        id="localeResolver"
        class="org.springframework.web.servlet.i18n.CookieLocaleResolver"/>
</beans>

加载国际化资源文件

指定国际化资源文件的路径,以及文件的编码。

<!-- 国际化 -->
<bean
    id="messageSource"
    class="org.springframework.context.support.ResourceBundleMessageSource"
    p:basenames="message"
    p:defaultEncoding="utf-8">
</bean>

国际化拦截器

使用Cookie来实现国际化,必须设置国际化操作拦截器:

<mvc:interceptors>
    <!-- 国际化操作拦截器 如果采用基于（请求/Session/Cookie）则必需配置 -->
    <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor"/>
</mvc:interceptors>

创建CookieLocaleResolver

注意,此处将默认配置的localeResolver换成了CookieLocaleResolver

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<bean
    id="localeResolver"
    class="org.springframework.web.servlet.i18n.CookieLocaleResolver"/>

UserController.java

@Controller
public class UserController {
    @RequestMapping(value = "/loginForm")
    public String loginForm(String request_locale, Model model, HttpServletRequest request,
                            HttpServletResponse response)
    {
        System.out.println("request_locale = " + request_locale);
        if (request_locale != null)
        {
            if (request_locale.equals("zh_CN"))
            {
                Locale locale = new Locale("zh", "CN");
                (new CookieLocaleResolver()).setLocale(request, response, locale);
            } else if (request_locale.equals("en_US"))
            {
                Locale locale = new Locale("en", "US");
                (new CookieLocaleResolver()).setLocale(request, response, locale);
            } else
            {
                (new CookieLocaleResolver()).setLocale(request, response,
                    LocaleContextHolder.getLocale());
            }
        }
        User user = new User();
        model.addAttribute("user", user);
        // 跳转页面
        return "loginForm";
    }
    @PostMapping(value = "/login")
    public String login(@ModelAttribute User user, Model model, HttpServletRequest request)
    {
        // System.out.println(user);
        if (user.getLoginname() != null && user.getLoginname().equals("xiaoming")
                && user.getPassword() != null && user.getPassword().equals("123456"))
        {
            // 从后台代码获取国际化信息
            RequestContext requestContext = new RequestContext(request);
            String username = requestContext.getMessage("username");
            user.setUsername(username);
            model.addAttribute("user", user);
            return "success";
        }
        return "error";
    }
}

UserController的loginForm方法根据提交的request_locale参数值,创建CookieLocaleResolver对象并调用CookieLocaleResolver对象的setLocale方法将语言环境设置在Cookie中,从而进行语言环境切换.

loginForm.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<%@taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>测试基于ConversionService的国际化</title>
</head>
<body>
    <a href="loginForm?request_locale=zh_CN">中文</a> |
    <a href="loginForm?request_locale=en_US">英文</a>
    <br />
    <h3>
        <!-- 显示国际化title文本 -->
        <spring:message code="title" />
    </h3>
    <form:form modelAttribute="user" method="post" action="login">
        <table>
            <tr>
                <!-- 显示国际化loginname文本 -->
                <td><spring:message code="loginname" /></td>
                <td><form:input path="loginname" /></td>
            </tr>
            <tr>
                <!-- 显示国际化password文本 -->
                <td><spring:message code="password" /></td>
                <td><form:input path="password" /></td>
            </tr>
            <tr>
                <td><input type="submit" value="<spring:message code="submit"/>" /></td>
            </tr>
        </table>
    </form:form>
</body>
</html>

loginForm.jsp中通过<spring:message code="国际化文本" />的形式来填写相应的国际化文本.

success.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>测试基于ConversionService的国际化</title>
</head>
<body>
    <spring:message code="welcome" arguments="${requestScope.user.username}" />
</body>
</html>