globalization

Overview

By default, SpringMVC determines the localization type of the client based on the Accept-Language parameter.
When receiving a request, SpringMVC will look for a localization resolver (LocalResolver) in the context, and use it to obtain the localization type information corresponding to the request.
SpringMVC also allows to assemble an interceptor that dynamically changes the localization type, so that the localization type of a single request can be controlled by specifying a request parameter.
Example 1:

in18_index.jsp

<html>
<head>
    <title>in18_index</title>
</head>
<body>
        <a  href="i18n">i18n page</a>
</body>
</html>

i18n.jsp :

<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>i18n</title>
</head>
<body>
    <fmt:message key="i18n.username"></fmt:message>
    <a href="i18n2">i18n2 page</a>
</body>
</html>

i18n2.jsp：

<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>i18n2</title>
</head>
<body>
    <fmt:message key="i18n.password"></fmt:message>
    <a href="i18n">i18n page</a>
</body>
</html>

springmvc.xml added:

 <!--配置国际化资源文件-->
    <bean  id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
        <property name="basename" value="i18n"></property>
    </bean>

<!--配置直接转发的页面-->
    <!--可以直接转发相应的页面,无需再经过Handler方法-->
    <mvc:view-controller path="i18n" view-name="i18n"></mvc:view-controller>
    <mvc:view-controller path="i18n2" view-name="i18n2"></mvc:view-controller>

resource

i18n.properties

i18n.username=username
i18n.password=password

i18n_zh_CH.properties

i18n.username=用户名
i18n.password=密码

i18n_en_US.properties

i18n.username=Username
i18n.password=Password

How SessionLocaleResolver &LocaleChangeInterceptor works

Working principle diagram

Localization Parser and Localization Interceptor

AcceptHeaderLocaleResolver: Determine the localization type according to the Accept-Language parameter of the HTTP request header. If no localization resolver is explicitly defined, SpringMVC uses the resolver.
CookieLocaleResolver: Determines the localization type based on the specified cookie value
SessionLocaleResolver: Determines the localization type based on specific properties in the Session
LocaleChangeInterceptor: Get
the .

Modify springmvc.xml

<!--配置直接转发的页面-->
    <!--可以直接转发相应的页面,无需再经过Handler方法-->
    <mvc:view-controller path="success" view-name="success"></mvc:view-controller>
    <!--<mvc:view-controller path="i18n" view-name="i18n"></mvc:view-controller>-->
    <mvc:view-controller path="i18n2" view-name="i18n2"></mvc:view-controller>

springmvc.xml adds:

<!--配置:SessionLocaleResolver-->
    <!--此处id必须是localeResolver-->
    <!--否则发生Request processing failed; nested exception is java.lang.UnsupportedOperationException: Cannot change HTTP accept header - use a different locale resolution strategy-->
    <bean id="localeResolver" class="org.springframework.web.servlet.i18n.SessionLocaleResolver"></bean>

    <!--配置LocaleChangeInterceptor-->
    <mvc:interceptors>
        <bean id="localeChangeInterceptor" class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor"></bean>
    </mvc:interceptors>

i18n.jsp adds:

    <a href="i18n?locale=zh_CH">中文</a>
    <a href="i18n?locale=en_US">英文</a>

handler:I18nHandler.java


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.support.ResourceBundleMessageSource;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.Locale;


@Controller
public class I18nHandler {

        @Autowired
        private ResourceBundleMessageSource messageSource ;

        @RequestMapping("/i18n")
        public String testI18n(Locale locale ){
            String val = messageSource.getMessage("i18n.username",null ,locale) ;
            System.out.println(val);
            return "i18n" ;

        }
}

The language display can be switched on the i18n page.

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SpringMVC 19. Internationalization

globalization

Overview

How SessionLocaleResolver &LocaleChangeInterceptor works

Localization Parser and Localization Interceptor

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