本周介绍SpringBoot项目的国际化是如何处理的,阅读本章前请阅读【SpringBoot】SpringBoot与Thymeleaf模版(六)的相关内容
国际化原理
1、在Spring中有国际化Locale(区域信息对象);LocaleResolver(获取区域信息对象,区域信息解析器),2个重要的对象,通过区域信息解析器就能自动给页面绑定不同的数据内容。
2、查看SpringBoot项目中,WebMvcAutoConfiguration类中有注入区域信息解析器AcceptHeaderLocaleResolver
1 // 注入区域信息解析器 2 @Bean 3 @ConditionalOnMissingBean 4 @ConditionalOnProperty(prefix = "spring.mvc", name = "locale") 5 public LocaleResolver localeResolver() { 6 if (this.mvcProperties.getLocaleResolver() == WebMvcProperties.LocaleResolver.FIXED) { 7 return new FixedLocaleResolver(this.mvcProperties.getLocale()); 8 } 9 // 默认注入AcceptHeaderLocaleResolver区域信息解析器 10 AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver(); 11 localeResolver.setDefaultLocale(this.mvcProperties.getLocale()); 12 return localeResolver; 13 }
3、查看AcceptHeaderLocaleResolver.java源码,它返回的区域信息对象,是从请求头获取 语言信息
1 @Override 2 public Locale resolveLocale(HttpServletRequest request) { 3 Locale defaultLocale = getDefaultLocale(); 4 if (defaultLocale != null && request.getHeader("Accept-Language") == null) { 5 return defaultLocale; 6 } 7 // 从请求中获取 语言类型 8 Locale requestLocale = request.getLocale(); 9 List<Locale> supportedLocales = getSupportedLocales(); 10 if (supportedLocales.isEmpty() || supportedLocales.contains(requestLocale)) { 11 return requestLocale; 12 } 13 Locale supportedLocale = findSupportedLocale(request, supportedLocales); 14 if (supportedLocale != null) { 15 return supportedLocale; 16 } 17 return (defaultLocale != null ? defaultLocale : requestLocale); 18 }
4、F12查看浏览器请求,发现所有请求都会带上语言信息
国际化开发
1、新建一个SpringBoot的web项目。pom.xml文件如下:
1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 5 <modelVersion>4.0.0</modelVersion> 6 7 <groupId>com.test</groupId> 8 <artifactId>test-springboot-i18n</artifactId> 9 <version>1.0-SNAPSHOT</version> 10 11 <parent> 12 <groupId>org.springframework.boot</groupId> 13 <artifactId>spring-boot-starter-parent</artifactId> 14 <version>2.1.8.RELEASE</version> 15 </parent> 16 17 <properties> 18 19 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 20 <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> 21 <java.version>1.8</java.version> 22 </properties> 23 24 <dependencies> 25 <dependency> 26 <groupId>org.springframework.boot</groupId> 27 <artifactId>spring-boot-starter-web</artifactId> 28 </dependency> 29 30 <dependency> 31 <groupId>org.springframework.boot</groupId> 32 <artifactId>spring-boot-starter-thymeleaf</artifactId> 33 </dependency> 34 35 <dependency> 36 <groupId>org.springframework.boot</groupId> 37 <artifactId>spring-boot-starter-test</artifactId> 38 <scope>test</scope> 39 </dependency> 40 41 </dependencies> 42 43 44 <!-- SpringBoot打包插件,可以将代码打包成一个可执行的jar包 --> 45 <build> 46 <plugins> 47 <plugin> 48 <groupId>org.springframework.boot</groupId> 49 <artifactId>spring-boot-maven-plugin</artifactId> 50 </plugin> 51 </plugins> 52 </build> 53 </project>