java读取classpath下的properties文件

@Test
public void readPro(){
//建立properties对象
Properties properties=new Properties();
//通过输入流读取在classpath下的properties文件
InputStream in = properties.getClass().getResourceAsStream("/db.properties");
try {
//将文件的内容加载到properties对象中
properties.load(in);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(properties.getProperty("jdbc.username"));
System.out.println(properties.getProperty("jdbc.url"));
System.out.println(properties.getProperty("jdbc.password"));
System.out.println(properties.getProperty("jdbc.driverClassName"));
}