spring注解注入泛型子类

spring注解注入泛型子类

关于spring如何注入泛型实现类

以下是项目的工程图




dao和service都使用了泛型设计

泛型dao接口

Java code

1	public interface BaseDao<T, PK extends Serializable>{

泛型dao实现类

Java code

1	public class BaseDaoImpl<T, PK extends Serializable>implements BaseDao<T, PK> {

学员接口

Java code

1	public interface StudentDao extends BaseDao<Student, Integer> {

学员实现类

Java code

1 2	@Repository public class StudentDaoImpl extends BaseDaoImpl<Student, Integer> implements StudentDao {

使用junit进行测试的时候会报下面的异常。

Caused by: org.springframework.beans.factory. NoUniqueBeanDefinitionException: No qualifying bean of type [cn.ssh.annotation.dao.BaseDao] is defined: expected single matching bean but found 4: baseDaoImpl,studentDaoImpl,teacherDaoImpl,studentServiceImpl

1	ApplicationContext context = new ClassPathXmlApplicationContext( "applicationContext.xml" );

2	StudentDao studentDaoImpl = (StudentDaoImpl) context.getBean( "studentDaoImpl" )

解决方案一:为BaseDaoImpl指定名称,后面调用时根据该名称即可.

1	@Repository ( "baseDao" )

2	public class BaseDaoImpl<T, PK extends Serializable> implements BaseDao<T, PK> {

解决方案二:将BaseDaoImpl声明为抽象类,不交由spring ioc管理,子类交由spring管理即可.

1	public abstract class BaseDaoImpl<T, PK extends Serializable> implements BaseDao<T, PK> {