基于spring注解，泛型的使用

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/** * Service基类，所有Service均继承该类 * */public abstract class BaseService<T> {    /* 所有子类直接通过该SQLSession操作数据库 */    @Resource(name = "sqlSession")    protected SqlSession sqlSession;    protected Class<T> clazz;    protected  String DOMAIN_NAME;    /* 用于记录日志 */    protected Logger logger=null ;    @SuppressWarnings("unchecked")    @PostConstruct    public void postConstruct(){         try {            Type type= this.getClass().getGenericSuperclass();            ParameterizedType parameterizedType=(ParameterizedType) type;            clazz= (Class<T>) parameterizedType.getActualTypeArguments()[0];            DOMAIN_NAME =clazz.getName();        } catch (Exception e) {            e.printStackTrace();            clazz=null;        }        logger = LoggerFactory.getLogger(this.getClass());    }    // base根据主键ID查询方法    @Transactional(readOnly = true)    public T getByID(Long id)throws Exception {        try {            return sqlSession.selectOne(DOMAIN_NAME + ".selectByPrimaryKey", id);        } catch (Exception e) {            logger.error("根据{}获取{}发生错误：{}", id, DOMAIN_NAME,e.getMessage(), e);            throw e;        }    }    // base新增方法    @Transactional    public void saveBase(T entity) throws Exception{        try {            sqlSession.insert(DOMAIN_NAME+".insertSelective",entity);        } catch (Exception e) {            e.printStackTrace();            throw e;        }    }    // base修改方法    @Transactional    public int updateBase(T entity) throws Exception{        try{            return sqlSession.update(DOMAIN_NAME+".updateByPrimaryKeySelective",entity);        }catch(Exception e){            logger.error(DOMAIN_NAME+"修改时发生错误：{}", e.getMessage(), e);            throw e;        }    }    // base删除方法    @Transactional    public void deleteBase(Long id) throws Exception {        try {            sqlSession.delete(DOMAIN_NAME + ".deleteByPrimaryKey", id);        } catch (Exception e) {            logger.error(DOMAIN_NAME+"删除时发生错误：{}", e.getMessage(), e);            throw e;        }    }}
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