Java spring framework learning. Describe the application of Java spring framework through a simple example

MySpring\.classpath
MySpring\.project
MySpring\bin\applicationContext.xml
MySpring\bin\com\interfacer\beans.xml
MySpring\bin\com\interfacer\ChangeLetter.class
MySpring\bin\com\service\DepartmentService.class
MySpring\bin\com\service\UserService.class
MySpring\bin\com\test\InterfaceTest.class
MySpring\bin\com\test\LowerCase.class
MySpring\bin\com\test\Test.class
MySpring\bin\com\test\UpperCase.class
MySpring\lib\commons-logging-1.2.jar
MySpring\lib\spring.jar
MySpring\src\applicationContext.xml
MySpring\src\com\interfacer\beans.xml
MySpring\src\com\interfacer\ChangeLetter.java
MySpring\src\com\service\DepartmentService.java
MySpring\src\com\service\UserService.java
MySpring\src\com\test\InterfaceTest.java
MySpring\src\com\test\LowerCase.java
MySpring\src\com\test\Test.java
MySpring\src\com\test\UpperCase.java
MySpring\bin\com\interfacer
MySpring\bin\com\service
MySpring\bin\com\test
MySpring\src\com\interfacer
MySpring\src\com\service
MySpring\src\com\test
MySpring\bin\com
MySpring\src\com
MySpring\bin
MySpring\lib
MySpring\src
MySpring

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