5.6.3 页面国际化

• 先确保项目的file encodings都是utf-8

• 先建立这3个国际化配置文件

• login.properties

login.password=密码
login.tip=请登陆
login.btn=登陆
login.username=用户名
login.rememberme=记住我
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• login_en_US.properties

login.password=password
login.tip=Please sign in
login.btn=sign in
login.username=username
login.rememberme=Rememberme
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• login_zh_CN.properties

login.password=密码
login.tip=请登陆
login.btn=登陆
login.username=用户名
login.rememberme=记住我
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• 在根据MessageSourceAutoConfiguration消息转换类的源码去配置spring.messages属性

@AutoConfiguration
@ConditionalOnMissingBean(name = AbstractApplicationContext.MESSAGE_SOURCE_BEAN_NAME, search = SearchStrategy.CURRENT)
@AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE)
@Conditional(ResourceBundleCondition.class)
@EnableConfigurationProperties
public class MessageSourceAutoConfiguration {

   private static final Resource[] NO_RESOURCES = {};

   @Bean
   @ConfigurationProperties(prefix = "spring.messages")
   public MessageSourceProperties messageSourceProperties() {
      return new MessageSourceProperties();
   }
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spring:
    messages:
      basename: i18n.login   #消息转换配置
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• 之后在用国际化标签#{}修改index.html页面，并修改国际化：链接、参数

   
      
      
      
      
      
      
      
      
      
   

   
      

         
         
Please sign in
         Username
         
         Password
         
         

            
          [[#{login.rememberme}]]
        
         
         sign in
         
© 2017-2018
         中文
         English
      

   


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• 之后阅读WebMvcAutoConfiguration源码分析地区国际化解析器的原理，发现自定义了LocaleResolver就不会走默认自动装配的国际化了

@Override
@Bean
@ConditionalOnMissingBean(name = DispatcherServlet.LOCALE_RESOLVER_BEAN_NAME)
public LocaleResolver localeResolver() {
   if (this.webProperties.getLocaleResolver() == WebProperties.LocaleResolver.FIXED) {
      return new FixedLocaleResolver(this.webProperties.getLocale());
   }
   AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();
   localeResolver.setDefaultLocale(this.webProperties.getLocale());
   return localeResolver;
}
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• 所以要实现自定义地区国际化解析器，实现此接口，重写方法然后注册bean到config中即可生效.如LocaleResolver接口AcceptHeaderLocaleResolver实现类中的resolveLocale实现

public class AcceptHeaderLocaleResolver implements LocaleResolver{
@Override
	public Locale resolveLocale(HttpServletRequest request) {
		Locale defaultLocale = getDefaultLocale();
		if (defaultLocale != null && request.getHeader("Accept-Language") == null) {
			return defaultLocale;
		}
		Locale requestLocale = request.getLocale();
		List supportedLocales = getSupportedLocales();
		if (supportedLocales.isEmpty() || supportedLocales.contains(requestLocale)) {
			return requestLocale;
		}
		Locale supportedLocale = findSupportedLocale(request, supportedLocales);
		if (supportedLocale != null) {
			return supportedLocale;
		}
		return (defaultLocale != null ? defaultLocale : requestLocale);
	}
}
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• 自定义国际化组件

package com.zk.config;

import org.springframework.util.StringUtils;
import org.springframework.web.servlet.LocaleResolver;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Locale;

/**
 * @author CNCLUKZK
 * @create 2022/8/2-1:29
 */
public class MyLocaleResolver implements LocaleResolver {

    //自定义地区国际化解析
    @Override
    public Locale resolveLocale(HttpServletRequest request) {
        //获取请求的语言参数
        String l = request.getParameter("l");
        Locale locale = Locale.getDefault(); //如果没有就使用默认的国际化
        //若请求携带了国际化参数
        if (StringUtils.hasText(l)) {
            //国家、地区
            locale = new Locale(l.split("_")[0], l.split("_")[1]);
        }
        return locale;
    }

    @Override
    public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {

    }
}
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• 记得将自己写的组件配置到spring容器`@Bean，注意请求地址，注意@Bean的方法名
• SpringMVC中约定自定义LocaleResolver Bean的名称必须是localeResolver

 /**
      * @Bean相当于beans中的单个的bean标签，注册到容器中
      * 方法名字相当于bean标签的id
      * 方法返回值相当于bean标签的Class属性
      * 返回要注入的bean对象
     * */
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package com.zk.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
/**
 * @author CNCLUKZK
 * @create 2022/7/31-20:19
 */
//扩展springmvc
//如果。你想diy一些定制化的功能，只要写这个组件，然后将它交给springboot,springboot就会帮我们自动装魔！
//应为类型要求为WebMvcConfigurer,所以我们实现其接口
//可以使用自定义类扩展springmvc的功能
@Configuration
public class MyMvcConfiguration implements WebMvcConfigurer {

    //视图跳转
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        //浏览器发送特殊请求，就会跳转到特定页面
        registry.addViewController("/").setViewName("index");
        registry.addViewController("/index").setViewName("index");
        registry.addViewController("/index.html").setViewName("index");
    }

    //注册自定义的国际化解析bean
    @Bean
    public LocaleResolver localeResolver(){
        return new MyLocaleResolver();
    }
}
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• 然后访问http://127.0.0.1:8081/zk/index.html?l=zh_CN进行测试，中英文效果：
  
  

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