动态获取打包Jar后的路径信息

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打包后的java文件已经在jar包里面，如何获取路径信息呢？
 
 
 
String path = null;String jarPath = MyDataSource.class.getProtectionDomain()        .getCodeSource().getLocation().getPath();try {path = URLDecoder.decode(jarPath, "UTF-8").replaceAll("client.jar", "").replaceAll("%20", " ");} catch (UnsupportedEncodingException e) {log.error(e.getMessage());}log.info("path is:"+path);  
 
  client.jar为打包的jar名