读取 JSF Web 应用程序静态代码中的 .properties 文件

我想从静态块中的属性文件获取数据库连接参数。属性文件位置是WEB-INF/classes/db.properties.

我会更喜欢使用getResourceAsStream()方法。我尝试了很多方法，但都返回了null.

private static Properties prop = new Properties();
static{
    try {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        ServletContext servletContext = (ServletContext) facesContext.getExternalContext().getContext();
        InputStream inputStream = servletContext.getResourceAsStream("/db.properties"); 
        InputStream is = prop.getClass().getResourceAsStream("/db.properties");
        if(inputStream!=null){//it is null
            prop.load(inputStream);
        }
        if(is!=null){//it is null
            prop.load(is);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

这是如何引起的以及如何解决？

正如 Thufir 在评论中所写，有一个关于从 Java 代码中读取属性的很好的教程：http://jaitechwriteups.blogspot.ca/2007/01/how-to-read-properties-file-in-web.html http://jaitechwriteups.blogspot.ca/2007/01/how-to-read-properties-file-in-web.html

/** 
 * Some Method 
 *  
 * @throws IOException 
 *  
 */  
public void doSomeOperation() throws IOException {  
    // Get the inputStream  
    InputStream inputStream = this.getClass().getClassLoader()  
            .getResourceAsStream("myApp.properties");  

    Properties properties = new Properties();  

    System.out.println("InputStream is: " + inputStream);  

    // load the inputStream using the Properties  
    properties.load(inputStream);  
    // get the value of the property  
    String propValue = properties.getProperty("abc");  

    System.out.println("Property value is: " + propValue);  
}