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错误写法：
cxt = new ClassPathXmlApplicationContext();
productService = (ProductService)cxt.getBean("productTypeServiceBean");
正确写法：
cxt = new ClassPathXmlApplicationContext("beans.xml");
productService = (ProductService)cxt.getBean("productTypeServiceBean");
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原文地址：http://www.cnblogs.com/lomomiao/p/4269519.html
