about 4 years ago
有時候不小心疏忽了就會無法注入，所以紀錄一下
大部分的時候設計都會像是工廠模式，但是使用的方式不同要小心注入的對象而有差異
如果是像下面用抽象類別來注入
/**
*
* @author samzhu
*
* @param <T> 實體物件
* @param <ID> ID類型 ex:String,Long,Integer
*/
public abstract class BaseService<T,ID extends Serializable> {
public abstract int save(T record);
public abstract int update(T record);
public abstract int updateOrReplace(T record);
public abstract T get(ID id);
}
那只需要標記@Service，直接引用即可自動注入
@Service
public class TokenmanaService extends BaseService<Tokenmana,String>{
@Autowired
private TokenmanaMapper tokenmanaMapper;
@Override
public int save(Tokenmana record) {
return tokenmanaMapper.insert(record);
}
@Override
public int update(Tokenmana record) {
record.setTimeupdate(new Date(System.currentTimeMillis()));
return tokenmanaMapper.updateByPrimaryKey(record);
}
@Override
public int updateOrReplace(Tokenmana record) {
return tokenmanaMapper.updateByPrimaryKey(record);
}
@Override
public Tokenmana get(String tokenid) {
Tokenmana tokenmana = tokenmanaMapper.selectByPrimaryKey(tokenid);
return tokenmana;
}
@Autowired
private TokenmanaService tokenmanaService;
如果是用介面來定義工廠
public interface BaseServiceInterface<T,ID extends Serializable> {
public int save(T record);
public int update(T record);
public int updateOrReplace(T record);
public T get(ID id);
}
那必須給元件名稱
@Component("tokenmanaServiceImpl")
public class TokenmanaServiceImpl implements BaseServiceInterface<Tokenmana,String>{
@Autowired
private TokenmanaMapper tokenmanaMapper;
@Override
public int save(Tokenmana record) {
return tokenmanaMapper.insert(record);
}
@Override
public int update(Tokenmana record) {
// TODO Auto-generated method stub
return 0;
}
@Override
public int updateOrReplace(Tokenmana record) {
// TODO Auto-generated method stub
return 0;
}
@Override
public Tokenmana get(String id) {
// TODO Auto-generated method stub
return null;
}
}
好方便注入時讓框架知道是哪個元件，因為是要注入到interface，這個要注意
@Autowired @Qualifier("tokenmanaServiceImpl")
private BaseServiceInterface tokenmanaService;
