Java多态机制在实际中的应用

PaymentTypeService.java

/**
 * 支付方式接口
 * @date: 2018年4月23日 下午2:20:09
 */
public interface PaymentTypeService {

	public String type();
	
	public void methodA();
	
	public void methodB();
}

APaymentTypeServiceImpl.java

import org.springframework.stereotype.Service;

/**
 * 支付方式A实现类
 * @date: 2018年4月23日 下午2:20:27
 */
@Service
public class APaymentTypeServiceImpl implements PaymentTypeService {

	private final String type = "A";
	
	@Override
	public void methodA() {
		// TODO Auto-generated method stub
		System.out.println("PaymentType A invoke methodA");
	}

	@Override
	public void methodB() {
		// TODO Auto-generated method stub
		System.out.println("PaymentType A invoke methodB");
	}

	@Override
	public String type() {
		return type;
	}

}

BPaymentTypeServiceImpl.java

/**
 * 支付方式B实现类
 * @date: 2018年4月23日 下午2:20:27
 */
@Service
public class BPaymentTypeServiceImpl implements PaymentTypeService {

	private final String type = "B";
	
	@Override
	public void methodA() {
		// TODO Auto-generated method stub
		System.out.println("PaymentType B invoke methodA");
	}

	@Override
	public void methodB() {
		// TODO Auto-generated method stub
		System.out.println("PaymentType B invoke methodB");
	}

	@Override
	public String type() {
		return type;
	}

}

DemoController.java

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class DemoController {
	
	private Map<String, PaymentTypeService> paymentTypeServices;
	
	/**
	 * 构造函数初始化不同支付方式类型和实现类引用map
	 * @param services
	 */
	public DemoController(@Autowired List<PaymentTypeService> services){
		paymentTypeServices = services.stream().collect(Collectors.toMap(PaymentTypeService::type, i->i));
	}

	/**
	 * 请求某个支付方式
	 * @date: 2018年4月23日 下午2:21:28 
	 * @param type
	 */
	@GetMapping("/test/{type}")
	public void test(@PathVariable("type") String type){
		// 获取该支付方式实现类
		PaymentTypeService service = paymentTypeServices.get(type);
		service.methodA();
		service.methodB();
	}
}