八、springMVC之国际化

一、关于国际化使用场景：

1.在页面上能够根据浏览器语言设置的情况对文本（不是内容），时间，数值进行本地化处理，显示对应语言的版本；

2.可以在bean中获取国际化资源文件LOCAL对应的消息，即在bean中获取当前消息，对应的语言版本；

3.可以通过超链接切换locale，而不再依赖浏览器的语言设置情况

二、场景实现

1.目录结构：

2.配置

web.xml:只配置了springDispatcherServlet；

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3     xmlns="http://xmlns.jcp.org/xml/ns/javaee"
 4     xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
 5     id="WebApp_ID" version="3.1">
 6     <servlet>
 7         <servlet-name>springDispatcherServletservlet-name>
 8         <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
 9         
10         
12         <init-param>
13             <param-name>contextConfigLocationparam-name>
14             <param-value>classpath:spring.xmlparam-value>
15         init-param>
16         
17         <load-on-startup>1load-on-startup>
18     servlet>
19 
20     
21     <servlet-mapping>
22         <servlet-name>springDispatcherServletservlet-name>
23         <url-pattern>/url-pattern>
24     servlet-mapping>
25 web-app>

spring.xml基础配置（适用于场景1、2）：

包扫描的配置、视图解析器配置，国际化资源文件配置、<mvc:annotation-driven>mvc:annotation-driven>；

 1 <context:component-scan base-package="handler">context:component-scan>
 2     
 3     <bean
 4         class="org.springframework.web.servlet.view.InternalResourceViewResolver">
 5         <property name="prefix" value="/">property>
 6         <property name="suffix" value=".jsp">property>
 7     bean>
 8     
 9     <bean id="messageSource"
10         class="org.springframework.context.support.ResourceBundleMessageSource">
11         <property name="basename" value="message">property>
12     bean>
13     
14     <mvc:annotation-driven>mvc:annotation-driven>

spring.xml配置（适用于场景3）：

实现通过超链接切换locale，而不再依赖浏览器的语言设置，需要配置

1 
2     <bean id="localeResolver"
3         class="org.springframework.web.servlet.i18n.SessionLocaleResolver">bean>
4      
5     <mvc:interceptors>
6         <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor"/>
7     mvc:interceptors>

完整配置为：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:mvc="http://www.springframework.org/schema/mvc"
 5     xmlns:context="http://www.springframework.org/schema/context"
 6     xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
 7         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 8         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
 9 
10     <context:component-scan base-package="handler">context:component-scan>
11     
12     <bean
13         class="org.springframework.web.servlet.view.InternalResourceViewResolver">
14         <property name="prefix" value="/">property>
15         <property name="suffix" value=".jsp">property>
16     bean>
17     
18     <bean id="messageSource"
19         class="org.springframework.context.support.ResourceBundleMessageSource">
20         <property name="basename" value="message">property>
21     bean>
22     
23     <mvc:annotation-driven>mvc:annotation-driven>
24     
25     
26     <bean id="localeResolver"
27         class="org.springframework.web.servlet.i18n.SessionLocaleResolver">bean>
28      
29     <mvc:interceptors>
30         <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor"/>
31     mvc:interceptors>
32     
33 beans>

3.国际化文件message_en_US.properties&message_zh_CN.properties

1 I18N.TEST_EN_US=TEST_EN_US

I18N.TEST_EN_US = 测试语言

4.EmployeeController.java

 1 package handler;
 2 
 3 import java.util.Locale;
 4 
 5 import org.springframework.beans.factory.annotation.Autowired;
 6 import org.springframework.context.support.ResourceBundleMessageSource;
 7 import org.springframework.stereotype.Controller;
 8 import org.springframework.web.bind.annotation.RequestMapping;
 9 
10 @RequestMapping("/emp")
11 @Controller
12 public class EmployeeController {
13     @Autowired
14     private ResourceBundleMessageSource messageSource;
15 
16     @RequestMapping("/testLang1")
17     public String testLang1() {
18         return "forward:/index.jsp";
19     }
20 
21     @RequestMapping("/testLang")
22     public String testLang(Locale locale) {
23         String val = messageSource.getMessage("I18N.TEST_EN_US", null, locale);
24         System.out.println(val);
25         return "forward:/index.jsp";
26     }
27 
28 }

5.index.jsp

分别使用 fmt 和spring tag;两种标签实现的结果是一致的，可以任意选择一种；

场景1、2测试页面；

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <%@page import="java.util.*"%>
 4 <%@ taglib prefix="s" uri="http://www.springframework.org/tags"%>
 5 <%@taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
 6 DOCTYPE html>
 7 <html>
 8 <head>
 9 <meta charset="UTF-8">
10 <title>Insert title heretitle>
11 head>
12 <body>
13 <p>    
14     <fmt:bundle basename="message">
15         <fmt:message key="I18N.TEST_EN_US">fmt:message>
16     fmt:bundle>
17     p>    
18     
19     <p><s:message code="I18N.TEST_EN_US">s:message>p>
20     
21 body>
22 html>

场景3的测试页面：

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <%@page import="java.util.*"%>
 4 <%@ taglib prefix="s" uri="http://www.springframework.org/tags"%>
 5 <%@taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
 6 DOCTYPE html>
 7 <html>
 8 <head>
 9 <meta charset="UTF-8">
10 <title>Insert title heretitle>
11 head>
12 <body>
13 <p>    
14     <fmt:setLocale value="${param.locale}"/>
15     <fmt:bundle basename="message">
16         <fmt:message key="I18N.TEST_EN_US">fmt:message>
17     fmt:bundle>
18     p>    
19     
20     <p><s:message code="I18N.TEST_EN_US">s:message>p>
21     
22 body>
23 html>