@Autowired与@Component（包括衍生类@Controller @Service @Repository ）
使用细节
@Autowired的定义的变量名，要与@Component 中的value（默认可以不写）值一致
正确例子：编译运行通过
public class AccountServiceTest {@Autowiredprivate AccountService myAccountService;（注意这儿变量名）}@Service("myAccountService")（注意这儿的字符串）public class AccountServiceImpl implements AccountService {@Autowiredprivate AccountDao accountDao;}
错误例子：编译报错，错误原因：NoClassDefFoundError
@Service("accountService")（看这的字符串）public class AccountServiceImpl implements AccountService {@Autowiredprivate AccountDao accountDao;}public class AccountServiceTest {@Autowiredprivate AccountService myAccountService;（注意这儿的变量名）}
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