9、SpringBoot-CRUD国际化

1）、编写国际化配置文件；

2）、使用ResourceBundleMessageSource管理国际化资源文件

3）、在页面使用fmt:message取出国际化内容

步骤：

1）、编写国际化配置文件，抽取页面需要显示的国际化

文件内容：

2）、使用thymeleaf的语法去引用（jsp是fmt）

<form class="form-signin" action="dashboard.html">

   <img class="mb-4" src="asserts/img/bootstrap-solid.svg" alt="" width="" height="">

   <h1 class="h3 mb-3 font-weight-normal" th:text="#{index_top}">Please sign in</h1>

   <label class="sr-only">Username</label>

   <input type="text" class="form-control" th:placeholder="#{index_Username}" placeholder="Username" required="" autofocus="">

   <label class="sr-only">Password</label>

   <input type="password" class="form-control" th:placeholder="#{index_password}" placeholder="Password" required="">

   <div class="checkbox mb-3">

      <label>

        <input type="checkbox" value="remember-me"> [[#{index_rember}]]

      </label>

   </div>

   <button class="btn btn-lg btn-primary btn-block" type="submit">Sign in</button>

   <p class="mt-5 mb-3 text-muted">© -</p>

   <a class="btn btn-sm" th:href="@{/index.html(l='zh_CN')}">中文</a>

   <a class="btn btn-sm" th:href="@{/index.html(l='en_US')}">English</a>

</form>

效果是根据浏览器的语言设置进行国际化的显示

3）运行查看

系统为英文

系统语言选择中文：

SpringBoot自动配置好了管理国际化资源文件的组件

@Configuration

@ConditionalOnMissingBean(

    value = {MessageSource.class},

    search = SearchStrategy.CURRENT

)

@AutoConfigureOrder(-)

@Conditional({MessageSourceAutoConfiguration.ResourceBundleCondition.class})

@EnableConfigurationProperties

public class MessageSourceAutoConfiguration {

    private static final Resource[] NO_RESOURCES = new Resource[];

    public MessageSourceAutoConfiguration() {

    }

    @Bean

    @ConfigurationProperties(

        prefix = "spring.messages"

    )

    public MessageSourceProperties messageSourceProperties() {

        return new MessageSourceProperties();

    }

    @Bean

    public MessageSource messageSource(MessageSourceProperties properties) {

        //管理国际化的

        ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();

        if (StringUtils.hasText(properties.getBasename())) {

            ////设置国际化资源文件的基础名（去掉语言国家代码的）

            messageSource.setBasenames(StringUtils.commaDelimitedListToStringArray(StringUtils.trimAllWhitespace(properties.getBasename())));

        }

        if (properties.getEncoding() != null) {

            messageSource.setDefaultEncoding(properties.getEncoding().name());

        }

        messageSource.setFallbackToSystemLocale(properties.isFallbackToSystemLocale());

        Duration cacheDuration = properties.getCacheDuration();

        if (cacheDuration != null) {

            messageSource.setCacheMillis(cacheDuration.toMillis());

        }

        messageSource.setAlwaysUseMessageFormat(properties.isAlwaysUseMessageFormat());

        messageSource.setUseCodeAsDefaultMessage(properties.isUseCodeAsDefaultMessage());

        return messageSource;

    }

    protected static class ResourceBundleCondition extends SpringBootCondition {

        private static ConcurrentReferenceHashMap<String, ConditionOutcome> cache = new ConcurrentReferenceHashMap();

        protected ResourceBundleCondition() {

        }

        public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {

            ////我们的配置文件可以直接放在类路径下叫messages.properties

            String basename = context.getEnvironment().getProperty("spring.messages.basename", "messages");

            ConditionOutcome outcome = (ConditionOutcome)cache.get(basename);

            if (outcome == null) {

                outcome = this.getMatchOutcomeForBasename(context, basename);

                cache.put(basename, outcome);

            }

            return outcome;

        }

        private ConditionOutcome getMatchOutcomeForBasename(ConditionContext context, String basename) {

            Builder message = ConditionMessage.forCondition("ResourceBundle", new Object[]);

            String[] var4 = StringUtils.commaDelimitedListToStringArray(StringUtils.trimAllWhitespace(basename));

            int var5 = var4.length;

            for(int var6 = ; var6 < var5; ++var6) {

                String name = var4[var6];

                Resource[] var8 = this.getResources(context.getClassLoader(), name);

                int var9 = var8.length;

                for(int var10 = ; var10 < var9; ++var10) {

                    Resource resource = var8[var10];

                    if (resource.exists()) {

                        return ConditionOutcome.match(message.found("bundle").items(new Object[]{resource}));

                    }

                }

            }

            return ConditionOutcome.noMatch(message.didNotFind("bundle with basename " + basename).atAll());

        }

        private Resource[] getResources(ClassLoader classLoader, String name) {

            String target = name.replace('.', '/');

            try {

                return (new PathMatchingResourcePatternResolver(classLoader)).getResources("classpath*:" + target + ".properties");

            } catch (Exception var5) {

                return MessageSourceAutoConfiguration.NO_RESOURCES;

            }

        }

    }

}

容器中没有就使用默认的

@Bean

@ConditionalOnMissingBean

@ConditionalOnProperty(

    prefix = "spring.mvc",

    name = {"locale"}

)

public LocaleResolver localeResolver() {

    if (this.mvcProperties.getLocaleResolver() == org.springframework.boot.autoconfigure.web.servlet.WebMvcProperties.LocaleResolver.FIXED) {

        return new FixedLocaleResolver(this.mvcProperties.getLocale());

    } else {

        AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();

        localeResolver.setDefaultLocale(this.mvcProperties.getLocale());

        return localeResolver;

    }

}

原理：

国际化的Local（区域信息对象）；LocalResolver（获取区域信息对象）

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[],split[]);

        }

        return locale;

    }

    @Override

    public void setLocale(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Locale locale) {

        resolveLocale(httpServletRequest);

    }

}

加入容器

@Bean(name="localeResolver")

public LocaleResolver MyLocaleResolver(){

    return  new MyLocaleResolver();

}

值得一说的是

@Bean()

public LocaleResolver localeResolver(){

    return  new MyLocaleResolver();

}

LocaleResolver 如果后面不跟localeResolver的话就需在@Bean指定name

点击即可进行切换

巴特西

9、SpringBoot-CRUD国际化

SpringBoot自动配置好了管理国际化资源文件的组件

最新文章

热门文章