1.創建UserDao接口以及UserDaoImpl實現類（接口代碼省略）

public class UserDaoImpl implements UserDao {private String username;private int age;public void setUsername(String username) {this.username = username;}public void setAge(int age) {this.age = age;}@Overridepublic void save1() {System.out.println(username+"======="+age);System.out.println("save running...");} }

2.創建UserService接口以及UserServiceImpl實現類（接口代碼省略）

public class UserServiceImpl implements UserService {private UserDao userDao;public UserServiceImpl() {}public UserServiceImpl(UserDao userDao) {this.userDao = userDao;}@Overridepublic void sava() {userDao.save1();} }

3.spring配置文件applicationContext.xml的操作

<?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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd"><bean id="userDao" class="com.hao.dao.impl.UserDaoImpl"><property name="username" value="張三"/><property name="age" value="30"/></bean><bean id="userService" class="com.hao.service.impl.UserServiceImpl"><constructor-arg name="userDao" ref="userDao"></constructor-arg></bean> </beans>

4.測試

public class UserController {public static void main(String[] args) {ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");UserService service = (UserService) context.getBean("userService");service.sava();} }

結果： 張三=======30
save running…

總結

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