Ioc配置——构造方法注入

import com.hw.dao.UserDao;
import com.hw.service.UserService;

public class UserServiceImpl implements UserService {
    /*
    使用构造方法注入的方式：添加constructor
     */
    private UserDao userDao;
    private int num;
    private String name;

    public UserServiceImpl(UserDao userDao, int num, String name) {
        this.userDao = userDao;
        this.num = num;
        this.name = name;
    }

    @Override
    public void save() {
        System.out.println("userServiceImpl save runing..." + num + " " + name);
        userDao.save();
    }
}

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd">
    <!-- 配置spring控制的资源 -->
    <!-- 2、将需要注入的资源声明为bean -->
    <bean id="userDao" class="com.hw.dao.impl.UserDaoImpl"/>

    <bean id="userService" class="com.hw.service.impl.UserServiceImpl">
        <constructor-arg name="userDao" ref="userDao" />
        <constructor-arg name="num" value="123" />
        <constructor-arg name="name" value="zs" />
    </bean>
</beans>