ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("./cn/itcast/a_hello/applicationContext.xml");
ClassPathXmlApplicationContext ac1 = new ClassPathXmlApplicationContext("/cn/itcast/a_hello/applicationContext.xml");
ClassPathXmlApplicationContext ac2 = new ClassPathXmlApplicationContext("cn/itcast/a_hello/applicationContext.xml");
ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("../src/cn/itcast/a_hello/applicationContext.xml");
四种加载方法，求讲解./ ../ / 没有/的有什么区别？ 求大神带！！！