java中获取路径的方式

System.out.println("1:" + Thread.currentThread().getContextClassLoader().getResource(""));  
System.out.println("2:" + LibrarySBIGenerelSQLTest.class.getClassLoader().getResource(""));  
System.out.println("3:" + ClassLoader.getSystemResource("")); 
System.out.println("4:" + LibrarySBIGenerelSQLTest.class.getResource(""));//IdcardClient.class文件所在路径  
System.out.println("5:" + LibrarySBIGenerelSQLTest.class.getResource("/")); // Class包所在路径，得到的是URL对象，用url.getPath()获取绝对路径String  
System.out.println("6:" + new File("/").getAbsolutePath());//获取盘符的根路径 
System.out.println("7:" + System.getProperty("user.dir"));//获取项目的根路径,
System.out.println("8:" + System.getProperty("file.encoding"));//获取文件编码