Java SpringBoot 获取接口实现类汇总

ServiceLoader<MyInterface> loader = ServiceLoader.load(接口名.class);

public enum XxxTypeEnum {
    XXX_1("code1", "xxx1业务"),
    XXX_2("code2", "xxx2业务"),
    ;
    private String code;
    private String desc;
    XxxTypeEnum(String code, String desc) {
        this.code = code;
        this.desc = desc;
    }
    public String getCode() {
        return code;
    }
    public void setCode(String code) {
        this.code = code;
    }
    public String getDesc() {
        return desc;
    }
    public void setDesc(String desc) {
        this.desc = desc;
    }

}

public interface IXxxService {

    /**
     *是否支持
     * @param xxxTypeEnum
     * @return
     */
    boolean isSupport(XxxTypeEnum xxxTypeEnum);

    /**
     * 拼接字符串业务方法
     *
     * @param a
     * @param b
     * @return
     */
    String spliceStr(String a, String b);
}

@Service
public class Xxx001ServiceImpl implements IXxxService {
    @Override
    public boolean isSupport(XxxTypeEnum xxxTypeEnum) {
        return XxxTypeEnum.XXX_1.equals(xxxTypeEnum);
    }
    @Override
    public String spliceStr(String a, String b) {
        return a + "--Xxx001ServiceImpl--" + "b";
    }
}

@Service
public class Xxx002ServiceImpl implements IXxxService {
    @Override
    public boolean isSupport(XxxTypeEnum xxxTypeEnum) {
        return XxxTypeEnum.XXX_2.equals(xxxTypeEnum);
    }
    @Override
    public String spliceStr(String a, String b) {
        return a + "--Xxx002ServiceImpl--" + "b";
    }

}

@Component
public class XxxServiceLocator implements ApplicationContextAware {
	/**
	 * 存储 IXxxService接口的所有实现类
	 */
	private Map<String, IXxxService> xxxServiceMap;
	private List<IXxxService> xxxServiceList;
	@Override
	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		// 通过上下文，根据接口类型返回相应的所有实现类bean
		xxxServiceMap = applicationContext.getBeansOfType(IXxxService.class);
		xxxServiceList = new ArrayList<>(xxxServiceMap.values());
	}
	/**
	 * 获取所有实现类
	 *
	 * @return
	 */
	public Map<String, IXxxService> getAllMap() {
		return xxxServiceMap;
	}

	/**
	 * 通过名称获取某个实现类
	 *
	 * @param beanName
	 *            bean名字
	 * @return
	 */
	private IXxxService getByName(String beanName) {
		return xxxServiceMap.get(beanName);
	}

	/**
	 * 获取所有实现类
	 *
	 * @return
	 */
	public List<IXxxService> getAllList() {
		return xxxServiceList;
	}

	/**
	 * 根据枚举获取某个实现类
	 *
	 * @param xxxTypeEnum
	 * @return
	 */
	public IXxxService get(XxxTypeEnum xxxTypeEnum) {
		IXxxService xxxService = xxxServiceList.stream().filter(s -> s.isSupport(xxxTypeEnum))
				.collect(Collectors.toList()).get(0);
		return xxxService;
	}

}

@RestController
@RequestMapping(value = "/xxx")
public class XxxController {
    /**
     * 方式1：直接使用spring依赖注入注解
     */
    @Autowired
    private Map<String, IXxxService> xxxServiceMap;

    /**
     * 方式2：直接使用spring的依赖注入注解
     */
    @Autowired
    private List<IXxxService> xxxServiceList;

    /**
     * 方式3：借助spring的ApplicationContextAware
     */
    @Autowired
    private XxxServiceLocator xxxServiceLocator;

    /**
     * 获取到所有实现类使用
     *
     */
    @RequestMapping(value = "/getAll", method = RequestMethod.GET)
    public void getAll() {
        String a = "asasa";
        String b = "bnbnb";
        Map<String, IXxxService> allMap = xxxServiceLocator.getAllMap();
        List<IXxxService> allList = xxxServiceLocator.getAllList();

        System.out.println("allMap              --->" + allMap);
        System.out.println("xxxServiceMap       --->" + xxxServiceMap);
        System.out.println("allList             --->" + allList);
        System.out.println("xxxServiceList      --->" + xxxServiceList);
        for (IXxxService iXxxService : xxxServiceList) {
            System.out.println("xxxServiceList执行结果  ---> " + iXxxService.spliceStr(a, b));
        }
        IXxxService iXxxService = xxxServiceLocator.get(XxxTypeEnum.XXX_1);
        System.out.println("XxxEnum.XXX_1执行结果  ---> " + iXxxService.spliceStr(a, b));
        iXxxService = xxxServiceLocator.get(XxxTypeEnum.XXX_2);
        System.out.println("XxxEnum.XXX_2执行结果  ---> " + iXxxService.spliceStr(a, b));

    }
}