Spring–注入类型–setter

攻城狮卿硕技术 2022年11月7日

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setter注入:

package com.bjsxt.service;
import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;public class UserService {
private UserDAO userDAO;
public void add(User user) {
userDAO.save(user);
}
public UserDAO getUserDAO() {
return userDAO;
}
public void setUserDAO(UserDAO userDAO) {
this.userDAO = userDAO;
}
}

bean.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
  <bean id="u" class="com.bjsxt.dao.impl.UserDAOImpl">
  </bean>
  <bean id="userService" class="com.bjsxt.service.UserService">
  <property name="userDAO" ref="u" />
  </bean>
</beans>

构造方法注入:

修改UserService.java, 加入构造函数:

package com.bjsxt.service;
import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;public class UserService {private UserDAO userDAO;
public void add(User user) {
userDAO.save(user);
}
public UserDAO getUserDAO() {
return userDAO;
}
public void setUserDAO(UserDAO userDAO) {
this.userDAO = userDAO;
}public UserService(UserDAO userDAO) {
super();
this.userDAO = userDAO;
}
}

bean.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">  <bean id="u" class="com.bjsxt.dao.impl.UserDAOImpl">
  </bean>  <bean id="userService" class="com.bjsxt.service.UserService">
　　　　<constructor-arg>
　　　　　　<ref bean="u"/>
       </constructor-arg>
  </bean>
</beans>