spring ioc创建对象学习笔记

public class User {
    private String name;
    private String pwd;

    public User(){
        System.out.println("无参构造方法执行");
    }
    public User(String name){
        System.out.println("有参构造方法执行");
        this.name=name;
    }

    public User(String name,String pwd){
        System.out.println("有参构造方法执行");
        this.name=name;
        this.pwd=pwd;
    }

    public void show(){
        System.out.println("用户:"+name);
        if(pwd!=null){
            System.out.println("密码:"+pwd);
        }
    }

    public void setName(String name) {
        System.out.println("set方法被执行");
        this.name=name;
    }
}

<?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">

    <bean name="hello" class="helloSpring.Hello">
        <property name="name" value="张三"></property>
    </bean>


    <bean id="mysqlDao" class="helloSpring.UserDaoMySqlImpl"></bean>
    <bean id="oracleDao" class="helloSpring.UserDaoOracleImpl"></bean>
    <bean id="service" class="helloSpring.UserServiceImpl">
        <property name="userDao" ref="mysqlDao"></property>
    </bean>


    <bean name="user" class="helloSpring.User">
        <property name="name" value="李四"></property>
    </bean>
    <bean name="user1" class="helloSpring.User">
        <constructor-arg index="0" value="王五"></constructor-arg>         <!--index为构造方法参数的下标-->
    </bean>
    <bean name="user2" class="helloSpring.User">
        <constructor-arg index="0" value="赵六"></constructor-arg>
        <constructor-arg index="1" value="233333"></constructor-arg>
    </bean>
    <bean name="user3" class="helloSpring.User">
        <constructor-arg type="java.lang.String" value="孙七"></constructor-arg>
        <constructor-arg index="1" value="244444"></constructor-arg>
    </bean>


    <bean id="user4" class="helloSpring.UserStaticFactory" factory-method="newInstance">    <!--静态工厂-->
        <constructor-arg index="0" value="钱八"></constructor-arg>
    </bean>
    <bean id="userDynamicFactory" class="helloSpring.UserDynamicFactory"></bean>            <!--动态工厂-->
    <bean id ="user5" factory-bean="userDynamicFactory" factory-method="newInstance">
        <constructor-arg index="0" value="周九"></constructor-arg>
    </bean>

</beans>

public class UserStaticFactory {
    public static User newInstance(String s) {
        return new User(s);
    }
}

public class UserDynamicFactory {
    public User newInstance(String name){
        return new User(name);
    }
}

package test;

import helloSpring.Hello;
import helloSpring.User;
import helloSpring.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {
    public static void main(String[] args){
        //解析beans.xml文件，生成管理相应的bean
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
//        Hello hello = (Hello)context.getBean("hello");
//        hello.show();

        User user=(User)context.getBean("user");
        user.show();
        User user1=(User)context.getBean("user1");
        user1.show();
        User user2=(User)context.getBean("user2");
        user2.show();
        User user3=(User)context.getBean("user3");
        user3.show();
        User user4=(User)context.getBean("user4");
        user4.show();
        User user5=(User)context.getBean("user5");
        user5.show();
    }
}

<bean name="user" class="helloSpring.User" scope="singleton">

User user=(User)context.getBean("user");
User userx=(User)context.getBean("user");
System.out.println(user+" "+userx);