标签:Coach container spring 28 public context class
section 4 : package com.luv2code.springdemo; public class BaseballCoach implements Coach { @Override public String getDailyWorkout() { return "spend 30 minutes on batting practice"; } } package com.luv2code.springdemo; public class MyApp { public static void main(String[] args) { // create the object Coach theCoach = new TrackCoach(); // use the object System.out.println(theCoach.getDailyWorkout); } } package com.luv2code.springdemo; public class TrackCoach implements Coach { @Override public String getDailyWorkout() { return "run a hard 5k"; } } // spring container // primary functions: // create and manage objects (Inversion of control) // inject object's dependencies(Dependency injection) // configuring spring container // 1 . xml config file 2, java annotation 3. java source code // spring dev process // 1 . configure spring beans //2 . create a spring container // 3 retrieve bean from spring container // step 1 : configure spring beans // file : applicationContext.xml <beans ..> <bean id = "myCoach" class = "com.luv2code.springdemo.BaseballCoach"> </bean> </beans> // id is like an alias , class path : fully qualified class name of implementation class // step 2 : create a spring container // spring container is generally known as ApplicationContext // Specialized implementations : // ClassPathXmlApplicationContext // AnnotationConfigApplicationContext ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml"); // step 3: retrieve beans from container Coach theCoach = context.getBean("myCoach", Coach.class); // Coach.class is the interface of BaseballCoach // spring bean is like java objects package com.luv2code.springdemo; public class HelloSpringApp { public static void main (String[] args) { //load the spring config file ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml"); // retrieve bean from spring container Coach theCoach = context.getBean("myCoach", Coach.class); // call methods on the bean System.out.println(theCoach.getDailyWorkout()); // close the context context.close(); } }
标签:Coach,container,spring,28,public,context,class 来源: https://www.cnblogs.com/tobeabetterpig/p/11497847.html
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