实现“设置注入”Spring示例 ——难点：实现逻辑有点绕

1、创建一个Maven JAVA项目: exp6_setjection；

2、在pom.xml中配置

      junit
      junit
      4.11
      test
    
    
	    org.springframework
	    spring-core
	    5.0.9.RELEASE
	
	
	    org.springframework
	    spring-context
	    5.0.9.RELEASE
	
  

3、实现Brand.java、Ford.java、Golf.java（参考示例文件）

Golf：

package org.exp6_setjection;

public class Golf implements Brand {

	public String brand() {
		// TODO Auto-generated method stub
		return ("高尔夫");
	}

}

 Ford：

package org.exp6_setjection;

public class Ford implements Brand {

	public String brand() {
		// TODO Auto-generated method stub
		return ("福特");
	}
}

Brand： 

package org.exp6_setjection;

public interface Brand {
	public String brand();
}

4、实现Car.java；

ps：注意这里的getBrand方法里，不能直接用生成的函数代码，要用brand类调用brand（）方法

package org.exp6_setjection;
import org.exp6_setjection.Brand;
public class Car {
	private Brand brand;

//	代码实现：添加getBrand()方法和setBrand()方法
	public String getBrand() {
		return brand.brand();
	}
	public void setBrand(Brand brand) {
		this.brand = brand;
	}
}

5、实现CarApp.java

package org.exp6_setjection;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
public class CarApp {
	public static void main( String[] args )
    {
		ApplicationContext ctx = new FileSystemXmlApplicationContext("src/applicationContext.xml");
		//代码实现：添加业务逻辑代码
	    Car car = null;  
	    car = (Car) ctx.getBean("carGolf");    
	    System.out.println(car.getBrand());
	    car = (Car) ctx.getBean("carFord");    
	    System.out.println(car.getBrand());
    }
}

6、在src目录下配置applicationContext.xml；

这里的bean要写包的全称：

否则报错

7、运行程序CarApp。