用个例子来演示什么是DI(Dependency injection) 1.下载spring-framework-2.0.7,在Eclipse加入两个lib: spring.jar和commons-logging.jar 代码: 1.GreetingService.java 2.GreetingServiceImpl.java 3.hello.xml 4.HelloApp.java java 代码 /**        * @{#} GreetingService.ja ...