Java 在tomcat web应用程序的类路径中动态添加属性文件

我正在尝试向类路径动态添加一个属性文件，如下所示

try {
    File fileToAdd = new File(FILE_PATH);
    URL u = fileToAdd.toURL();
    ClassLoader sysLoader = ClassLoader.getSystemClassLoader();
    if (sysLoader instanceof URLClassLoader) {
    sysLoader = (URLClassLoader) sysLoader;
    Class<URLClassLoader> sysLoaderClass = URLClassLoader.class;

    // use reflection to invoke the private addURL method
    Method method = sysLoaderClass.getDeclaredMethod("addURL",
        new Class[] { URL.class });
    method.setAccessible(true);
    method.invoke(sysLoader, new Object[] { u });
    }
} catch (Exception e) {
    logger.error(e.getMessage());
}

---

我在这个列表中看不到我的文件。我在这里遗漏了什么吗？

也许可以尝试一下这段代码，但要更改java.library.path，或者保持原样，如果您可以改用library路径的话

    /**
     * Allows you to add a path to the library path during runtime
     * @param dllLocation The path you would like to add
     * @return True if the operation completed successfully, false otherwise
     */
    public boolean addDllLocationToPath(final String dllLocation)
    {
        //our return value
        boolean retVal = false;
        try
        {
            System.setProperty("java.library.path", System.getProperty("java.library.path") + ";" + dllLocation);
            //get the sys path field
            Field fieldSysPath = ClassLoader.class.getDeclaredField("sys_paths");
            fieldSysPath.setAccessible(true);
            fieldSysPath.set(null, null);
            retVal = true;
        }
        catch (Exception e)
        {
            System.err.println("Could not modify path");
        }
        return retVal;
    }

---

无法添加属性文件的URL，必须添加属性文件所在目录的URL。如：

method.invoke（sysLoader，fileToAdd.getParent（）.tour（））
然后可以使用
ClassLoader.getResourceAsStream（“my.properties”）
类加载器将在新添加的目录中搜索该文件

从

此类加载器用于从引用JAR文件和目录的URL的搜索路径加载类和资源。任何以“/”结尾的URL都被假定为引用目录。否则，该URL被假定为引用将根据需要打开的JAR文件



    /**
     * Allows you to add a path to the library path during runtime
     * @param dllLocation The path you would like to add
     * @return True if the operation completed successfully, false otherwise
     */
    public boolean addDllLocationToPath(final String dllLocation)
    {
        //our return value
        boolean retVal = false;
        try
        {
            System.setProperty("java.library.path", System.getProperty("java.library.path") + ";" + dllLocation);
            //get the sys path field
            Field fieldSysPath = ClassLoader.class.getDeclaredField("sys_paths");
            fieldSysPath.setAccessible(true);
            fieldSysPath.set(null, null);
            retVal = true;
        }
        catch (Exception e)
        {
            System.err.println("Could not modify path");
        }
        return retVal;
    }