一、获取类路径(非web项目）
1、 test类与china.mid同一包shi
URL urlForAudio = getClass().getResource("china.mid");--------file:/D:/Program%20Files/eclipseforMVC/workspace/projectCase/bin/com/shi/china.mid
URL urlForAudio = getClass().getResource("");-----------file:/D:/Program%20Files/eclipseforMVC/workspace/projectCase/bin/com/shi/
URL urlForAudio = getClass().getResource("/");-----------file:/D:/Program%20Files/eclipseforMVC/workspace/projectCase/bin/
URL urlForAudio = getClass().getResource("../");---------file:/D:/Program%20Files/eclipseforMVC/workspace/projectCase/bin/com/
URL urlForAudio = getClass().getResource("../../");------file:/D:/Program%20Files/eclipseforMVC/workspace/projectCase/bin/
