Spring注入类型

第一中属性注入也就是setter注入（为属性提供相应的set和get方法）

package com.lbx.service.impl;

import com.lbx.dao.UserDao;
import com.lbx.po.User;
import com.lbx.service.UserService;

public class UserServiceImpl implements UserService {
	private UserDao userDao;

	private String name;
	private String age;
	
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getAge() {
		return age;
	}

	public void setAge(String age) {
		this.age = age;
	}
	
	@Override
	public void add(User user) {
		userDao.add(user);
	}
	
	public UserDao getUserDao() {
		return userDao;
	}
	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}

}

 

beans.xml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"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

<bean id="userDao" class="com.lbx.dao.impl.UserDaoImpl"></bean>
<!-- <bean id="userDao2" class="com.lbx.dao.impl.UserDaoImpl2"></bean> -->
<bean id="userService" class="com.lbx.service.impl.UserServiceImpl">
	<property name="userDao" ref="userDao"></property> <!--   这是一种Set注入,也就是调用相应的set方法,还有构造方法注入 -->
	<property name="name"><value>libinxuan</value> </property>
	<property name="age"><value>22</value> </property>
	<!--  
		也可以这样写
	<property name="userDao">
		<ref bean="userDao"></ref>
	</property>
	-->
	<!--<constructor-arg>			 这是一种构造方法注入,参数不好处理,可以是参数类型处理和index来处理		
		<ref bean="userDao"></ref>
	</constructor-arg> -->	
	
</bean>

</beans>

 

 

第二种就是构造函数注入（提供相应的构造方法）多个参数可按类型和索引来区分，有时候还得同时用类型和索引来区分

package com.lbx.service.impl;


import com.lbx.dao.UserDao;
import com.lbx.po.User;
import com.lbx.service.UserService;

public class UserServiceImpl implements UserService {
	private UserDao userDao;
	
	public UserServiceImpl(UserDao userDao) {
		super();
		this.userDao = userDao;
	}

	@Override
	public void add(User user) {
		userDao.add(user);
	}
	
	public UserDao getUserDao() {
		return userDao;
	}
	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}

}

 

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"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

<bean id="userDao" class="com.lbx.dao.impl.UserDaoImpl"></bean>
<!-- <bean id="userDao2" class="com.lbx.dao.impl.UserDaoImpl2"></bean> -->
<bean id="userService" class="com.lbx.service.impl.UserServiceImpl">
	<!--<property name="userDao" ref="userDao"></property>    这是一种Set注入,也就是调用相应的set方法,还有构造方法注入 -->
	<!--  
		也可以这样写
	<property name="userDao">
		<ref bean="userDao"></ref>
	</property>
	-->
	<constructor-arg>			<!-- 这是一种构造方法注入,参数不好处理,可以是参数类型处理和index来处理 -->			
		<ref bean="userDao"></ref>
	</constructor-arg>
	
</bean>

</beans>

 

 

第三种就是接口注入（一般只用属性注入也是就是使用setter注入）