基于 Spring MVC LocaleChangeInterceptor 注释不起作用

Question

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;
    }
}

以上是我的注解配置。我基本上已经翻译了this教程的XML。

奇怪的是，当我转到...?language=fr时它不起作用。

但是，以下方法确实有效（在app-servlet.xml 中）（注意这里使用的是locale）：

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

另一个需要注意的重要事情是，当我在上述方法上设置断点时，所有这三个方法，每个断点都会中断，这意味着“某人”正在读取这些值。

那么，为什么我的基于注释的拦截器不起作用？

Answer 1

通过WebMvcConfigurerAdapter 扩展配置类可能会有所帮助。 添加拦截器条目覆盖

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

方法。 还为LocaleChangeInterceptor添加bean条目

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

Answer 2

除了swap说的，还需要补充：

@Bean(name = "localeResolver")
public LocaleResolver getLocaleResolver(){
    return new CookieLocaleResolver();
}

bean 名称很重要。这就是 spring 将解析正确的语言环境解析器的方式。

您也可以返回 SessionLocaleResolver。

如果不添加这个会报如下错误：

Cannot change HTTP accept header - use a different locale resolution strategy

Answer 3

发布了 Spring MVC 4.1.4.RELEASE 本地化的完整示例。 也可以使用MKYong的example（可惜它的配置是基于XML的）来解决项目结构的问题。

package com.pizza.config;

import org.springframework.context.MessageSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ReloadableResourceBundleMessageSource;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.i18n.CookieLocaleResolver;
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

@Configuration
@EnableWebMvc
@ComponentScan(value = "com.pizza")
public class WebConfig extends WebMvcConfigurerAdapter {

    /* Resolvers and other MVC needs */

    @Bean
    public InternalResourceViewResolver getInternalResourceViewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();

        resolver.setViewClass(JstlView.class);
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");

        return resolver;
    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
    }


    /* Localization section is started */

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

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

    @Bean(name = "localeResolver")
    public LocaleResolver getLocaleResolver(){
        return new CookieLocaleResolver();
    }

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

}