spring的注入

构造注入

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


public class DoMain2 {
private User user;
private String name;
public DoMain2(User user, String name) {
this.user = user;
this.name = name;
}
public static void main(String[] args) {
ApplicationContext ac=new ClassPathXmlApplicationContext("spring-conf2.xml");
DoMain2 dm=ac.getBean("doMain",DoMain2.class);
dm.show();
}
public void show() {
System.out.println("user==>"+user+"--->>"+name);
}
}

xml

<bean id="user" class="cn.pay.test1.User">
<property name="id" value="2"/>
<property name="username" value="bbbb"/>
<property name="password" value="bbbb"/>
<property name="taken" value="2"/>
</bean>
<bean id="doMain" class="cn.pay.test1.DoMain2">
<constructor-arg name="user" index="0" type="cn.pay.test1.User" ref="user"/>
<constructor-arg name="name" index="1" type="String" value="String"/>
</bean>

set注入

private User user;
public void setUser(User user) {
this.user = user;
}
public static void main(String[] args) {
AbstractApplicationContext ac=new ClassPathXmlApplicationContext("spring-conf.xml");
DoMain dm = ac.getBean("doMain",DoMain.class);
dm.show();
ac.close();
}
public void show() {
System.out.println("user==>"+user);
}
public void init() {
//init-method="init"
/*
* 单例模式的时候会在容器启动的时候执行此方法
* 原型模式的时候会在创建对象的时候执行此方法
*/
System.out.println("初始化");
}
public void destroy() {
//destroy-method="destroy"
System.out.println("销毁前调用此方法");
}

xml

<bean id="user" class="cn.pay.test1.User">
<property name="id" value="1"/>
<property name="username" value="aaaa"/>
<property name="password" value="aaaa"/>
<property name="taken" value="1"/>
</bean>
<bean id="doMain" class="cn.pay.test1.DoMain" 
init-method="init" destroy-method="destroy" scope="singleton"
lazy-init="true">
<property name="user" ref="user"/>
</bean>