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private UserDao userDao;

public void (UserDao userDao) {
   this.userDao = userDao;
}

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<bean id="userDaoImpl" class="com.hs.dao.impl.UserDaoImpl"/>

<bean id="userServiceImpl" class="com.hs.service.impl.UserServiceImpl">
   <property name="userDao">
      <ref bean="userDaoImpl"/>
   </property>
</bean>

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private UserService userService;

public void setUserService(UserService userService) {
   this.userService = userService;
}

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10大专栏  Spring学习笔记（七）模拟实际开发过程的调用过程XML版-Setter方式注入/span>
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<bean id="userServiceImpl" class="com.hs.service.impl.UserServiceImpl">
   <property name="userDao">
      <ref bean="userDaoImpl"/>
   </property>
</bean>
<!--先UserController = new UserController()
   再userService = new userServiceImpl();
-->
<bean id="userController" class="com.hs.web.UserController" p:userService-ref="userServiceImpl">
   <!--<property name="userService" ref="userServiceImpl"/>-->
</bean>

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package com.hs.test;

import com.hs.web.UserController;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MethodTest {

   public void test01() {
      ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
      UserController controller = applicationContext.getBean("userController", UserController.class);
      controller.add();
   }
}