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Springmvc国际化自动配置代码实现

2020-04-11 07:05 519 查看

在 springmvc 中通过 LocalResover 获取区域信息对象 Local（对语言信息、国家代码等的封装），进行国际化配置，在 springboot 为我们提供了默认的区域信息解析器

@Configuration(
proxyBeanMethods = false
)
@ConditionalOnWebApplication(
type = Type.SERVLET
)
@ConditionalOnClass({Servlet.class, DispatcherServlet.class, WebMvcConfigurer.class})
@ConditionalOnMissingBean({WebMvcConfigurationSupport.class})
@AutoConfigureOrder(-2147483638)
@AutoConfigureAfter({DispatcherServletAutoConfiguration.class, TaskExecutionAutoConfiguration.class, ValidationAutoConfiguration.class})
public class WebMvcAutoConfiguration {
public static final String DEFAULT_PREFIX = "";
public static final String DEFAULT_SUFFIX = "";
private static final String[] SERVLET_LOCATIONS = new String[]{"/"};

@Bean
@ConditionalOnMissingBean  //容器中没有 LocaleResolver 时
@ConditionalOnProperty(
prefix = "spring.mvc",
name = {"locale"}
)
public LocaleResolver localeResolver() {　　　　　　　　//如果属性中指定用固定的就用固定的 FixedLocaleResolver 区域化信息解析器
if (this.mvcProperties.getLocaleResolver() == org.springframework.boot.autoconfigure.web.servlet.WebMvcProperties.LocaleResolver.FIXED) {
return new FixedLocaleResolver(this.mvcProperties.getLocale());
} else {　　　　　　　　　　//否则使用 AcceptHeaderLocaleResolver 区域化信息解析器
AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();
localeResolver.setDefaultLocale(this.mvcProperties.getLocale());
return localeResolver;
}
}

AcceptHeaderLocaleResolver 在 request 请求头中获取到区域信息

public class AcceptHeaderLocaleResolver implements LocaleResolver {
private final List<Locale> supportedLocales = new ArrayList(4);

public Locale resolveLocale(HttpServletRequest request) {
Locale defaultLocale = this.getDefaultLocale();
if (defaultLocale != null && request.getHeader("Accept-Language") == null) {
return defaultLocale;
} else {
Locale requestLocale = request.getLocale();
List<Locale> supportedLocales = this.getSupportedLocales();
if (!supportedLocales.isEmpty() && !supportedLocales.contains(requestLocale)) {
Locale supportedLocale = this.findSupportedLocale(request, supportedLocales);
if (supportedLocale != null) {
return supportedLocale;
} else {
return defaultLocale != null ? defaultLocale : requestLocale;
}
} else {
return requestLocale;
}
}
}

默认就是更具请求头带来的区域信息获取 Local 进行国际化

我们可以通过定义自己的区域化解析器生成区域化信息

public class MyLocaleResolver implements LocaleResolver {
@Override
public Locale resolveLocale(HttpServletRequest request) {
String l = request.getParameter("l");
Locale locale = Locale.getDefault();
if(!StringUtils.isEmpty(l)){
String[] split = l.split("_");
locale = new Locale(split[0],split[1]);
}
return locale;
}
@Override
public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {
}
}

@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {
@Bean
public LocaleResolver localeResolver(){
return new MyLocaleResolver();
}
}

量变引起质变，这就是我所理解的因果。

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标签： Spring mvc 国际化配置

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