如何在不重新启动Tomcat的情况下重新加载属性文件 [英] How to reload properties file without rebooting Tomcat

问题描述

我使用以下方法从类路径中加载属性文件:

I load a property file from classpath with the method :

    String cheminFichier = new StringBuilder(100).append(classeBP.getPackage().getName().replace(".", "/")).append(File.separator).append(
        REPERTOIRE_MAPPING).append(nomFichier).append(".properties").toString();
    InputStream isMapping = Thread.currentThread().getContextClassLoader().getResourceAsStream(cheminFichier.toString());
    if (isMapping == null)
    {
        throw new ServiceMappingException("Erreur lors du chargement du mapping du service. Le fichier "
            + cheminFichier + " n'existe pas.");
    }
    else
    {
        Properties mapping = new Properties();
        try
        {
            mapping.load(isMapping);
        }
        catch (IOException e)
        ...
    }

好的，可以.但是，如果在Tomcat运行时修改属性文件的内容，则更改将被忽略.它没有像类一样被热重载.

Ok, it's work. But if I modify the content of the property file when Tomcat is running, changes are ignored. It's not hot-reloaded as with classes.

我的上下文是使用 reloadable ="true" 选项配置的，并且Thread.currentThread().getContextClassLoader()返回的类加载器是WEBAPP类加载器(不是系统类加载器或其他类).

My context is configured with reloadable="true" option and the classloader returned by Thread.currentThread().getContextClassLoader() is the WEBAPP classloader (not the system classloader or other).

我读到可以使用ServletContext.getResourceAsStream，但是我无法访问Servlet上下文.

I read it's possible to use ServletContext.getResourceAsStream, but I haven't access to the servlet context.

这是Tomcat 5.5.

It's Tomcat 5.5.

有什么主意吗?如果没有，您是否有一种解决方案，可以强制重新加载特定资源(我的属性文件)?

Any idea ? If not, do you have a solution for forcing to reload a specific resource (my property file) ?

谢谢！

推荐答案

实际上，您的Web应用确实可以在各个点访问ServletContext.例如，您可以使用 ServletRequest.getServletContext()或通过 ServletContextListener 回调获得的 ServletContextEvent 来获取它.

Actually, your webapp does have access to the ServletContext at various points. For example you can get it using ServletRequest.getServletContext(), or from a ServletContextEvent obtained via a ServletContextListener callback.

这是个有点题外话，但是您应该意识到这段代码:

This is a bit off topic, but you should realise that this code:

String cheminFichier = new StringBuilder(100).append(classeBP.getPackage().getName().replace(".", "/")).append(File.separator).append(
    REPERTOIRE_MAPPING).append(nomFichier).append(".properties").toString();

可以/应该写为:

String cheminFichier = classeBP.getPackage().getName().replace(".", "/")) +
    File.separator + REPERTOIRE_MAPPING + nomFichier + ".properties";

在此处明确使用 StringBuilder 时，在此处没有性能优势，因为Java编译器会将连接编译为相同的代码.

There is no performance advantage here in explicitly using a StringBuilder here, because the Java compiler will compile the concatenation to the same code.

如果串联涉及循环，则只需使用 StringBuilder .

You only need to use a StringBuilder if the concatenation involves a loop.

这篇关于如何在不重新启动Tomcat的情况下重新加载属性文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！