(单选题,2.0分)从文件db.properties中读取参数名为url的正确代码是( )。

【单选题】
A InputStream in = DALSysuser.class.getClassLoader().getResourceAsStream("db.properties"); Properties prop = new Properties();prop.load(in); url = prop.getProperty("url");
B InputStream in = DALSysuser.getResourceAsStream("db.properties"); Properties prop = new Properties(); prop.load(in); url = prop.getProperty("url");
C InputStream in = DALSysuser.class.getClassLoader().getResourceAsStream("db.properties"); Properties prop = new Properties(); url = prop.getProperty("url");
D InputStream in = DALSysuser.class.getClassLoader().getResourceAsStream("db.properties"); prop.load(in); url = prop.getProperty("url");

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