spring setter流入

setter注入，是通过在通过构造器、静态工厂或实例工厂实例好Bean后，通过调用Bean类的setter方法进行注入依赖。

spring中 bean配置文件中：

<!-- 通过setter方式进行依赖注入 -->
<bean id="setterBean" class="com.spring.service.impl.HelloApiImpl2">
<property name="message" value="Hello World!"/>
<property name="index" value="1"/>
</bean>

 传统setter方法：

HelloApi helloApi=new HelloApiImpl2()  
helloApi.setMessage("hello world");
helloApi.setIndex(1);

 setter注入方式： 

setter注入方式只有一种根据setter名字进行注入：

<property name="message" value="Hello World!"/>

 name是setter注入名字，value是注入的常量值。

1.创建HelloApi接口类：

package com.spring.service;
public interface HelloApi {
    public void sayHello();
}

 2.创建实现HelloApi接口HelloApiImpl2类：

package com.spring.service.impl;
import com.spring.service.HelloApi;
public class HelloApiImpl2 implements HelloApi {
    private String message;
    private int index;  
	public String getMessage() {
		return message;
	}
	public void setMessage(String message) {
		this.message = message;
	}
	public int getIndex() {
		return index;
	}
	public void setIndex(int index) {
		this.index = index;
	}
	@Override
	public void sayHello() {
		System.out.println(index+":"+message);
	}

}

 3.创建Bean 配置spring-setterDependencyInject.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"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 通过setter方式进行依赖注入 -->
<bean id="setterBean" class="com.spring.service.impl.HelloApiImpl2">
<property name="message" value="Hello World!"/>
<property name="index" value="1"/>
</bean>
</beans>

 4.创建SetterDependencyInjectTest测试类：

package com.spring.test;
import org.junit.Test;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.spring.service.HelloApi;
public class SetterDependencyInjectTest {
@Test
public void setterDI(){
	BeanFactory beanFactory=new ClassPathXmlApplicationContext("spring-setterDependencyInject.xml");
 HelloApi bean=beanFactory.getBean("setterBean",HelloApi.class);
 bean.sayHello();
}
}

 5.测试结果：

1:Hello World!