Sping--自动装配(byname, bytype)

UserDAOImpl.java:

package com.bjsxt.dao.impl;

import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;

public class UserDAOImpl implements UserDAO {

	private int daoId;

	public int getDaoId() {
		return daoId;
	}

	public void setDaoId(int daoId) {
		this.daoId = daoId;
	}

	public void save(User user) {
		//Hibernate
		//JDBC
		//XML
		//NetWork
		System.out.println("user saved!");
	}

	@Override
	public String toString() {
		return "daoId=" + daoId;
	}

}

UserService.java:

package com.bjsxt.service;
import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;

public class UserService {
	private UserDAO userDAO;
	public void add(User user) {
		userDAO.save(user);
	}
	public UserDAO getUserDAO() {
		return userDAO;
	}
	public void setUserDAO(UserDAO userDAO) {
		this.userDAO = userDAO;
	}
}

UserServiceTest.java:

package com.bjsxt.service;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bjsxt.model.User;

//Dependency Injection
//Inverse of Control
public class UserServiceTest {
	@Test
	public void testAdd() throws Exception {
		ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
		UserService service = (UserService)ctx.getBean("userService");
		System.out.println(service.getUserDAO());
	}
}

bean.xml:

<?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-2.5.xsd"
          >

  <bean name="userDAO" class="com.bjsxt.dao.impl.UserDAOImpl">
  	<property name="daoId" value="1"></property>
  </bean>

  <bean name="userDAO2" class="com.bjsxt.dao.impl.UserDAOImpl">
  	<property name="daoId" value="2"></property>
  </bean>

  <bean id="userService" class="com.bjsxt.service.UserService" scope="prototype" autowire="byName">
  </bean>

</beans>

结果: 　daoId=1

bean.xml改成如下:

<?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-2.5.xsd"
          >
  <bean name="userDAO2" class="com.bjsxt.dao.impl.UserDAOImpl">
  	<property name="daoId" value="2"></property>
  </bean>
  <bean id="userService" class="com.bjsxt.service.UserService" scope="prototype" autowire="byType">
  </bean>
</beans>

结果: daoId=2