Spring中的@Service("dataDictionaryService")注解

Posted 2021-03-17 vole

1、接口

public interface DataDictionaryService {
    /**
     * 获取兑换率
     * @param coinType 原币种
     * @param billCoin 折币种
     * @param date 取离该时间最近的兑换率
     * @return
     */
    public BigDecimal getExch(String coinType, String billCoin, Date date);

}

 

 如图，有两个实现类。

2、实现类

@Service("dataDictionaryService")
public class DataDictionaryCache implements DataDictionaryService{
    @Autowired
    private DataDictionaryServiceImpl dataDictionaryService;

    private Map<ExchConditions,Exch> exchMap = new ConcurrentHashMap<>();

    @Autowired
    private CacheManager cacheManager;

    //private Map<PrpDcurrency,prpDcurrency> prpDcurrencyMap=new ConcurrentHashMap<>();

    @Override
    public BigDecimal getExch(String coinType, String billCoin, Date date) {
        ExchConditions exchConditions = new ExchConditions(coinType,billCoin,date);
        if(!exchMap.containsKey(exchConditions)
                || exchMap.get(exchConditions).isTimeout()){
            BigDecimal exch = dataDictionaryService.getExch(coinType,billCoin,date);
            exchMap.put(exchConditions,new Exch(exch));
        }
        return exchMap.get(exchConditions).getExchrate();
    }
}

@Component
public class DataDictionaryServiceImpl implements DataDictionaryService {

    @Autowired
    private DictAPIService dictService;

    @Autowired
    private RelationBreakMapper relationBreakMapper;

    @Autowired
    private OutstandingBreakMapper outstandingBreakMapper;
    @Autowired
    private AssessBreakMapper assessBreakMapper;

    /**
     * 获取兑换率
     * @param coinType 原币种
     * @param billCoin 折币种
     * @param date 取离该时间最近的兑换率
     * @return
     */
    @Override
    public BigDecimal getExch(String coinType, String billCoin, Date date) {
        PrpDexch exch = null;
        try {
            exch = dictService.getPrpDexch("dms", date, coinType, billCoin);
        } catch (Exception e) {

            return BigDecimal.ZERO;
        }
        return exch == null ? BigDecimal.ZERO : exch.getExchRate().divide(new BigDecimal(exch.getBase()));
    }

3、调用

@Controller
@RequestMapping(value ="/dataDict")
public class DataDictController {

    @Autowired
    private DataDictionaryService dataDictionaryService;

说明：当一个接口有两个实现类时，需要在一个实现类的注解后加上@Service("dataDictionaryService")引号中的说明，在Controller调用时，属性名称必须与引号中的名称一致，不然无法识别创建哪个实现类的Bean。

其实会出现编译报错如下：

 

 

不能自动装配。“DataDictionaryService”类型的bean不止一个。

bean:

dataDictionaryCache (dataDictionaryCache .java)

dataDictionaryServiceImpl (dataDictionaryServiceImpl .java)