Spring接口编程_设值注入和构造注入

说明：

UserManagerImp是设值注入，UserManagerImp2是构造注入

接口不注入，也就是在Spring配置文件中没有接口的<bean>，但是定义的时候是用接口

private IUserDao userDao;

IUserManager userManager2=(IUserManager) factory.getBean("userManager2");

类都注入，①UserManagerImp和UserManagerImp2属于实现类

　　　　　②UserDaoImp是Dao类也要注入

　　　　　前者①中有属性userDao,userDao可以通过设值和构造俩中方法注入

　　　　　后者②中没有属性，所以只写了<bean>

1.文件

<?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-3.0.xsd">

    <bean name="userManager" class="com.wangcf.manager.UserManagerImp">

        <!--设值注入   -->

        <property name="userDao" ref="userDao"></property>

    </bean>

    <bean name="userManager2" class="com.wangcf.manager.UserManagerImp2">

        <!-- 构造注入 -->

        <constructor-arg ref="userDao"/>

    </bean>

    <bean name="userDao" class="com.wangcf.Dao.UserDaoImp"></bean>

</beans>

2.Dao

package com.wangcf.Dao;

public interface IUserDao {

    public void addUser();

}

package com.wangcf.Dao;

public class UserDaoImp implements IUserDao{

    public void addUser(){

        System.out.println("UserDaoImp addUser...");

    }

}

3.manager

package com.wangcf.manager;

public interface IUserManager {

    public void addUser();

}

package com.wangcf.manager;

import com.wangcf.Dao.IUserDao;

public class UserManagerImp implements IUserManager{

    private IUserDao userDao;

    //设值注入

    public void setUserDao(IUserDao userDao) {

        this.userDao = userDao;

    }

    public void addUser(){

        System.out.println("UserManagerImp  addUser...");

        this.userDao.addUser();

    }

}

package com.wangcf.manager;

import com.wangcf.Dao.IUserDao;

public class UserManagerImp2 implements IUserManager{

    private IUserDao userDao;

    //构造注入

    public UserManagerImp2(IUserDao userDao) {

        // TODO Auto-generated constructor stub

        this.userDao=userDao;

    }

    @Override

    public void addUser() {

        // TODO Auto-generated method stub

        System.out.println("UserManagerImp2 addUser...");

        this.userDao.addUser();

    }

}

4.test

package com.wangcf.test;

import org.springframework.beans.factory.BeanFactory;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.wangcf.manager.IUserManager;

import junit.framework.TestCase;

public class UserManagerTest extends TestCase{

    public void testAddUser(){

        BeanFactory factory=new ClassPathXmlApplicationContext("applicationContext.xml");

        IUserManager userManager=(IUserManager) factory.getBean("userManager");

        userManager.addUser();

        System.out.println("=============");

        IUserManager userManager2=(IUserManager) factory.getBean("userManager2");

        userManager2.addUser();

    }

}

5.输出