spring使用注解通过子类注入父类的私有变量

方法一

通过 super.setBaseDao方法设置父类私有变量

父类

public class BaseServiceImpl {
private BaseDao baseDao;

public BaseDao getBaseDao() {
return baseDao;
}

public void setBaseDao(BaseDao baseDao) {
this.baseDao = baseDao;
}

public void test(){
System.out.println("TsetService...... ");
baseDao.test();
}
}

子类

@Service("testServiceImpl")
public class TestServiceImpl extends BaseServiceImpl{

@Resource(name="testDao")
public void initBaseDao(TestDao testDao) {
super.setBaseDao(testDao);
}

}

方法二

@PostConstruct是Java EE 5引入的注解，Spring允许开发者在受管Bean中使用它。当DI容器实例化当前受管Bean时，@PostConstruct注解的方法会被自动触发，从而完成一些初始化工作

父类同上

子类

@Service("testServiceImpl")
public class TestServiceImpl extends BaseServiceImpl{

private TestDao testDao;

public TestDao getTestDao() {
return testDao;
}

@Resource(name="testDao")
public void setTestDao(TestDao testDao) {
this.testDao = testDao;
}

@PostConstruct
public void initBaseDao(TestDao testDao) {
super.setBaseDao(testDao);
}

}

方法三

父类被注入对象非私有，子类重写setter方法注入到父类变量

父类

public class BaseServiceImpl {
protected BaseDao baseDao;

public BaseDao getBaseDao() {
return baseDao;
}

public void setBaseDao(BaseDao baseDao) {
this.baseDao = baseDao;
}

public void test(){
System.out.println("TsetService...... ");
baseDao.test();
}
}

子类

@Service("testServiceImpl")
public class TestServiceImpl extends BaseServiceImpl{

@Resource(name="testDao")
public void setBaseDao(BaseDao baseDao) {
this.baseDao = baseDao;
}

}