Spring依赖注入方式

Spring注入方式有三种：

1.接口注入(不常用)

2.构造器注入

3.setter注入

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构造方法注入：

public class UserService {
?????????????????????public UserService(UserDAO userDAO) {
?????????????????? ?super();
??????????????????? this.userDAO = userDAO;
?????????? }
}

<bean id="userDao" ref="u" />
?</bean>

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1.使用构造器方式注入

private PersonDaoBean personDaoBean;

private String name;

private int id;

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public PersonServiceBeanImpl(PersonDaoBean personDaoBean, String name,

int id) {

this.personDaoBean = personDaoBean;

this.name = name;

this.id = id;

}

<bean id="personService" type="com.zhen.dao.PersonDaoBean" ref="personDaoBean"/>

<constructor-arg index="1">

<value>chenzhen</value>

</constructor-arg>

<constructor-arg index="2" value="110"/>

</bean>