public class UserDao{
 public void inserUser(User user){
  //具体逻辑省略
 }
}

public Interface UserService{
 void inserUser(User user);
}

public class UserServiceImpl implements UserService{
 private UserDao userDao;
 public void setUserDao(UserDao userDao){
  this.userDao = userDao;
 }
 public void insertUser(User user){
  userDao.insert(user);
 }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:context="http://www.springframework.org/schema/context"
 xsi:schemaLocation="http://www.springframework.org/schema/beans 
 http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
 http://www.springframework.org/schema/context
 http://www.springframework.org/schema/context/spring-context-2.5.xsd ">
 <!--省略一些无关的配置书写-->
 <bean id="userDao" class="UserDao"></bean>
 <bean id="userService" class="UserServiceImpl">
 <property name="userDao" ref="userDao">
 </bean>
 </beans>

public class User{
 //为了简便，就写两个属性
 private String name;
 private Integer age;
 //关于name,age的getter/setter方法省略
 public User(String name,int age){
  this.name = name;
  this.age = age;
 }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:context="http://www.springframework.org/schema/context"
 xsi:schemaLocation="http://www.springframework.org/schema/beans 
 http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
 http://www.springframework.org/schema/context
 http://www.springframework.org/schema/context/spring-context-2.5.xsd ">
 <!--省略一些无关的配置书写-->
 <bean id="user" class="User">
  <!--构造函数参数的下标从0开始(避免出现多个构造函数具有相同的参数个数)-->
  <constructor-arg type="java.lang.String" index="0" value="zhangsan"/>
  <constructor-arg type="java.lang.Integer" index="1" value="20>
 </bean>
 </beans>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:context="http://www.springframework.org/schema/context"
 xsi:schemaLocation="http://www.springframework.org/schema/beans 
 http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
 http://www.springframework.org/schema/context
 http://www.springframework.org/schema/context/spring-context-2.5.xsd ">
 <!--省略一些无关的配置书写-->
 <bean id="userDao" class="UserDao"></bean>
 <bean id="userService class="UserServiceImpl">
  <!--构造函数参数的下标从0开始(避免出现多个构造函数具有相同的参数个数)-->
  <constructor-arg index="0" ref="userDao">
 </bean>
 </beans>

@Component
public class UserDao{
 public void inserUser(User user){
  //具体逻辑省略
 }
}

public Interface UserService{
 void inserUser(User user);
}

//引入相应的Spring包
@Service
public class UserServiceImpl implements UserService{
 @Autowire
 private UserDao userDao;
 public void insertUser(User user){
  userDao.insert(user);
 }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:context="http://www.springframework.org/schema/context"
 xsi:schemaLocation="http://www.springframework.org/schema/beans 
 http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
 http://www.springframework.org/schema/context
 http://www.springframework.org/schema/context/spring-context-2.5.xsd ">
 <!--省略一些无关的配置书写-->
 <!--*代表对所有的包进行扫描，在实际开发中可以根据涉及到注解组件的包进行扫描-->
 <context:component-scan base-package="*">
<!-- 开启组件扫描 -->
</context:component-scan>
<context:annotation-config>
<!--开启注解处理器-->
</context:annotation-config>

 <bean id="userDao" class="UserDao"></bean>
 <bean id="userService" class="UserServiceImpl"/>
 </beans>