基于Spring MVC LocaleChangeInterceptor的注释不起作用

问题描述

import java.util.Locale;

import org.springframework.context.MessageSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ReloadableResourceBundleMessageSource;
import org.springframework.web.servlet.HandlerMapping;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.i18n.CookieLocaleResolver;
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;
import org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping;

@Configuration
public class Config {
    @Bean
    public LocaleResolver localeResolver() {
        final CookieLocaleResolver ret = new CookieLocaleResolver();
        ret.setDefaultLocale(new Locale("en_US"));
        return ret;
    }

    @Bean
    public MessageSource messageSource() {
        final ReloadableResourceBundleMessageSource ret = new ReloadableResourceBundleMessageSource();
        ret.setBasename("classpath:lang");
        ret.setDefaultEncoding("UTF-8");
        return ret;
    }

    @Bean
    public HandlerMapping handlerMapping() {
        final LocaleChangeInterceptor interceptor = new LocaleChangeInterceptor();
        interceptor.setParamName("language");

        final DefaultAnnotationHandlerMapping ret = new DefaultAnnotationHandlerMapping();
        ret.setInterceptors(new Object[] { interceptor });
        return ret;
    }
}

以上是我的注释配置.我基本上已经翻译了此教程的XML.

The above is my annotation configuration. I've basically translated this tutorial's XML.

奇怪的是，当我转到...?language=fr时，它不起作用.

Strangely it doesn't work when I go to ...?language=fr.

但是，以下操作确实有效(在app-servlet.xml中)(请注意，这里使用的是locale):

However, the following does work (in app-servlet.xml) (notice here it's using locale):

<mvc:interceptors>
    <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
        <property name="paramName" value="locale" />
    </bean>
</mvc:interceptors>

要注意的另一重要事项是，当我在上述方法上设置断点时，这三种方法全部都断了，这意味着某人"正在读取值.

Another important thing to note is that when I put breakpoints on the above methods, all of the three of them, every breakpoint does break, which implies that "someone" is reading the values.

那么，为什么我的基于注释的拦截器不起作用?

So, why wouldn't my annotation based interceptor doesn't work?

推荐答案

通过WebMvcConfigurerAdapter扩展配置类可能会有所帮助.添加拦截器条目替代

Extending config class by WebMvcConfigurerAdapter may help.to add interceptor entry override

public void addInterceptors(InterceptorRegistry registry) {
   registry.addInterceptor(localeChangeInterceptor());
}

方法.还为LocaleChangeInterceptor

@Bean
public LocaleChangeInterceptor localeChangeInterceptor(){
    LocaleChangeInterceptor localeChangeInterceptor=new LocaleChangeInterceptor();
    localeChangeInterceptor.setParamName("language");
    return localeChangeInterceptor;
}

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