Spring-依赖注入之构造器方式注入

构造器注入-带有参数的构造函数注入

项目结构如下：



1、新建第一个bean文件

PersonServiceBean.java：

/*
*@Author swxctx
*@time 2016年9月27日
*/
package com.sw.servicebean;

public class PersonServiceBean {
private String name;

public String getName() {
return name;
}

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

2、新建第二个bean

UserServiceBean.java：

/*
*@Author swxctx
*@time 2016年9月27日
*/
package com.sw.servicebean;

import com.sw.service.UserService;

public class UserServiceBean implements UserService {
/* (non-Javadoc)
* @see com.sw.servicebean.UserService#save(com.sw.servicebean.PersonServiceBean)
*/
@Override
public void save(PersonServiceBean person){
System.out.println(person.getName());
}
}

3、定义接口（在2之前）

UserService.java：

/*
*@Author swxctx
*@time 2016年9月27日
*/
package com.sw.service;

import com.sw.servicebean.PersonServiceBean;

public interface UserService {

void save(PersonServiceBean person);

}

4、实现注入：、

FirstBean.java：

/*
*@Author swxctx
*@time 2016年9月27日
*/
package com.sw.servicebean;

public class FirstBean {
private PersonServiceBean personServiceBean;
private UserServiceBean userServiceBean;

public FirstBean(PersonServiceBean personServiceBean,UserServiceBean userServiceBean){
this.personServiceBean = personServiceBean;
this.userServiceBean = userServiceBean;
System.out.println("调用PersonServiceBean与UserServiceBean");
}

public void save(){
personServiceBean.setName("xc");
userServiceBean.save(personServiceBean);
}
}

5、配置文件

beans.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"> 
<!-- 配置bean -->
<bean id="personServiceBean" class="com.sw.servicebean.PersonServiceBean"></bean>
<bean id="userServiceBean" class="com.sw.servicebean.UserServiceBean"></bean>
<!-- 注入到 firstbean -->
<bean id="firstBean" class="com.sw.servicebean.FirstBean">
<!-- 创建构造器注入 -->
<constructor-arg ref="personServiceBean"></constructor-arg>
<constructor-arg ref="userServiceBean"></constructor-arg>
</bean>

</beans>