Question

我正在尝试使用Vaadin ClassResource类从将与WAR一起部署的文件加载我的数据库连接属性，但我似乎无法找到该文件。我使用的是Vaadin 6.5.2，Tomcat 7.0.6，我将“app.properties”文件放在与我的应用程序主文件相同的包中。

我的代码在Scala中。这是我尝试的：

val cr = new ClassResource("app.properties",this) // "this" is the application
debug("resource mimeType = {}",cr.getMIMEType)
debug("resource bufferSize = {}", cr.getBufferSize)
debug("resource cacheTime = {}",cr.getCacheTime)
debug("resource fileName = {}", cr.getFilename)
val ds = cr.getStream
if (ds != null) {  
  debug("download stream bufferSize = {}", ds.getBufferSize)
  debug("download stream cacheTime = {}",ds.getCacheTime)

  val is = ds.getStream // get InputStream

  if (is != null) {
    val props = new Properties
    props.load(is)
    val dbHost = props.get("db.host").asInstanceOf[String]
    val dbName = props.get("db.name").asInstanceOf[String]
    val dbPort = props.get("db.port").asInstanceOf[String]
    val dbUser = props.get("db.user").asInstanceOf[String]
    val dbPass = props.get("db.pass").asInstanceOf[String]
    val dbUri = props.get("db.uri").asInstanceOf[String]
  } else {
    debug("Input stream was null")
  }
} else {
  debug("Download stream was null")
}

结果如下：

08:51:59.617 ["http-bio-8084"-exec-11] DEBUG c.sentientswarm.propdesk.AppConfig$ - resource mimeType = application/octet-stream
08:51:59.620 ["http-bio-8084"-exec-11] DEBUG c.sentientswarm.propdesk.AppConfig$ - resource bufferSize = 0
08:51:59.621 ["http-bio-8084"-exec-11] DEBUG c.sentientswarm.propdesk.AppConfig$ - resource cacheTime = 86400000
08:51:59.621 ["http-bio-8084"-exec-11] DEBUG c.sentientswarm.propdesk.AppConfig$ - resource fileName = app.properties
08:51:59.621 ["http-bio-8084"-exec-11] DEBUG c.sentientswarm.propdesk.AppConfig$ - download stream bufferSize = 0
08:51:59.621 ["http-bio-8084"-exec-11] DEBUG c.sentientswarm.propdesk.AppConfig$ - download stream cacheTime = 86400000
08:51:59.621 ["http-bio-8084"-exec-11] DEBUG c.sentientswarm.propdesk.AppConfig$ - Input stream was null

我尝试将配置文件放在各种位置，包括顶部的src，位于保存主题的VAADIN文件夹的顶部，以及它当前的位置（与主应用程序在同一个包中），但结果总是一样的。谁能告诉我我做错了什么???

Answer 1

这就是我们这样做的方式。

        InputStream is=null;
    try
    {
        is=Application.class.getClassLoader().getResourceAsStream("Application.properties");
    }
    catch(Exception x)
    {
        log.error("Error loading 'Application.properties' properties",x);
        return null;
    }

    if (is!=null)
    {
        try
        {
            Properties props=new Properties();
            props.load(is);
            return(props);
        }
        catch (IOException e)
        {
            log.error("Error reading properties 'Application.properties' ",e);
        }
    }

    return(null);

然而，公平地说，我们不会制造战争并保持我们的应用程序未爆炸。请记住，Application.class不是Vaadin应用程序，而是我们自己的Vaadin应用程序包装器。

Answer 2

我将.properties文件复制到应用程序上下文目录中并按以下方式读取

Properties properties = new Properties();
properties.load(new FileInputStream(getContext().getBaseDirectory().getAbsolutePath() + "/application.properties"));

从应用程序类调用上面的代码。

找不到Vaadin ClassResource

2 个答案: