使用Spring注释注入父类依赖项的正确方法 [英] Proper way to inject parent class dependencies with Spring annotations

问题描述

我有以下代码-

Dao.java

@Component
public class Dao extends NamedParameterJdbcDaoSupport {

}

dbContext.xml

 <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
            destroy-method="close">
            <property name="driverClassName" value="${db.driver}" />
            <property name="url" value="${db.jdbc.url}" />
            <property name="username" value="${db.user}" />
            <property name="password" value="${db.password}" />
        </bean>

applicationContext.xml

<context:component-scan base-package="com.kshitiz" />

问题是NamedParameterJdbcDaoSupport需要数据源才能工作. 由于这是超级类的属性，而不是我自己的类的属性，所以我想使它起作用的唯一方法是-

The problem is that NamedParameterJdbcDaoSupport needs data source in order to work. Since this is a property of the super class and not my own class the only way I could think of to make it work is -

@Component
public class Dao extends NamedParameterJdbcDaoSupport {
    @Autowired
    public void setDataSource(DataSource dataSource) {
        super.setDataSource(dataSource);
    }
}

这很丑.我可以指定我要自动装配bean的所有属性吗?像-

This is pretty ugly. Can I specify that I want to autowire all the properties of my bean? Something like -

@Component(default-autowire="byType")
public class Dao extends NamedParameterJdbcDaoSupport {

}

春天有可能吗?另外，注入超类依赖项的最优雅的方法是什么?

Is this possible in Spring? Alternatively what is the most elegant way to inject super class dependencies?

修改: 我已经知道可以使用当前使用的XML来完成此操作.我想知道仅使用注释就可以做到的最好的事情.

I already know this can be done using XML which I am presently using. I'd like to know the best that can be done using annotations only.

推荐答案

不一定是您要寻找的答案，但是我会使用中介超类来做到这一点.

Not necessarily the answer you were looking for, but I would do this with an intermediary super class.

public abstract class AbstractDao extends NamedParameterJdbcDaoSupport {
    @Autowired
    public void setDataSource(DataSource dataSource) {
        super.setDataSource(dataSource);
    }
}

@Component
public class Dao extends AbstractDao {
}

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