birt读取配置文件.properties

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我贴下我的代码
[javascript] 
importPackage( Packages.java.io,Packages.java.util,Packages.java.net ); 
importPackage( Packages.javax.servlet.http ); 
req = reportContext.getHttpServletRequest( );        
propPath = "/WEB-INF/jdbc.properties";  www.zzzyk.com
url = req.getSession( ).getServletContext( ).getResource( propPath );    // 获得配置文件的相对路径 
if ( url != null )                                                    //  如果文件的相对路径不为空，则读取配置文件 
{ 
    props = new java.util.Properties(); 
    props.load( url.openStream() ); 
extensionProperties.odaURL = new String(props.getProperty("jdbc.url")); 
extensionProperties.odaDriverClass = new String(props.getProperty("jdbc.driverClassName")); 
extensionProperties.odaUser = new String(props.getProperty("jdbc.username")); 
extensionProperties.odaPassword = new String(props.getProperty("jdbc.password")); 
} 

补充：web前端 , JavaScript ,