java MessageSource不重新加载属性文件

Question

有一个MessageSourcebean：

@Bean
public MessageSource messageSource(){
    ReloadableResourceBundleMessageSource messageSource=new ReloadableResourceBundleMessageSource();
    messageSource.setDefaultEncoding("UTF-8");
    messageSource.setBasenames("classpath:/messages/messages");
    return messageSource;
}

我在某个地方读到，如果我使用ReloadableResourceBundleMessageSource，messageSource不应该被缓存，并且每次查看属性文件时，如果它们是特定的字符串。不幸的是，用这种方式创建的bean不起作用。编译后，如果我添加一些属性，Spring Boot将找不到它。 属性文件位于/resources/messages/messages.properties和/resources/messages/messages_en.properties中

Answer 1

试试这个解决方案。 首先：在web配置中配置bean，如下所示

@Bean
public MessageSource messageSource () {
    ReloadableResourceBundleMessageSourceExt messageResource =
            new ReloadableResourceBundleMessageSourceExt();
    messageResource.setAlwaysUseMessageFormat(false);
    messageResource.setBasenames("classpath:messages");
    messageResource.setDefaultEncoding(CHARACTER_ENCODING);
    messageResource.setFallbackToSystemLocale(true);
    messageResource.setUseCodeAsDefaultMessage(false);
    messageResource.setCacheSeconds(1); // by default it set to -1 which means cache 
                                        // forever messageSourse.
                                        // set 0 to check reload messeageSource on 
                                        // every getMessageSource request but reload 
                                        // only those files which last modified 
                                        // timestamp is changed.
                                        // value greater than 1 is treated as the 
                                        // time interval between reload.
    return messageResource;
}

第二：创建一个扩展ReloadableResourceBundleMessageSource的类，以公开其内部类的受保护方法，如下所示

public class ReloadableResourceBundleMessageSourceExt extends ReloadableResourceBundleMessageSource {

public Properties getPropertiesByFileName(String fileName){
    return super.getProperties(fileName).getProperties();
}

}

第三：现在像这样自动连接bean

@Service 
public class MyMessagesBundleService {

final private String fileName = "classpath:messages";

@Autowired
ReloadableResourceBundleMessageSourceExt messageSource;
Properties properties = messageSource.getPropertiesByFileName(this.fileName);
// now change the properties and saved it.
// after saved call clear cache and get again.
messageSource.clearCache();

}