Spring管理对象的DI注入

• 管理对象属性的注入： 基本类型 int float boolean ... String
• 赋值同时做一些运算
  1.算数： +、-、*、/、%等 ^在spring中是幂运算
  2.比较 > 、>=、 < 、<=、 !=、 == ； gt、 ge、 lt、 le、 ne、 eq
  3.赋值的时候可能遇到对象的形式

  {beanId} or #{beanName}

  可以操作对象 操作对象的属性 和对象的方法
• 配置文件如下：

<?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:c="http://www.springframework.org/schema/c"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean name="logo" class="domain.Logo" c:name="huawei" c:color="银色">

    </bean>
    <bean id="computer" class="domain.Computer">
<!--        <constructor-arg name="name" value="#{'mi'}"></constructor-arg>-->
        <constructor-arg name="price" value="#{20000.22}"></constructor-arg>
        <constructor-arg name="siez" value='#{((2 * 4) ^ 2 -1 * 4 + 4 * 2)/2}'></constructor-arg>
<!--        <constructor-arg name="status" value="#{true}"></constructor-arg>-->
<!--        <constructor-arg name="status" value="#{(10 lt 20)}"></constructor-arg>  < -->
<!--        <constructor-arg name="status" value="#{(10 gt 20)}"></constructor-arg>  > -->
<!--        <constructor-arg name="status" value="#{(10 ge 20)}"></constructor-arg>  >= -->
<!--        <constructor-arg name="status" value="#{(10 le 20)}"></constructor-arg>  <= -->
<!--        <constructor-arg name="status" value="#{(10 eq 20)}"></constructor-arg>  ==-->
<!--        <constructor-arg name="status" value="#{30 ne 20}"></constructor-arg>    !=-->
<!--        <constructor-arg name="status" value="#{not (1>2)}"></constructor-arg>-->
        <constructor-arg name="status" value="#{true and (12>2)}"></constructor-arg>
        <constructor-arg name="logo" value="#{logo}"></constructor-arg>
        <constructor-arg name="name" value="#{logo.test()}"></constructor-arg>
        
    </bean>
</beans>

代码如下：
Computer 类

public class Computer {
    private String name;
    private Float price;
    private int siez;
    private boolean status;
    private Logo logo;

    public Computer(String name, Float price, int siez, boolean status, Logo logo) {
        this.name = name;
        this.price = price;
        this.siez = siez;
        this.status = status;
        this.logo = logo;
    }

    public Computer(){}


    @Override
    public String toString() {
        return "Computer{" +
                "name='" + name + '\'' +
                ", price=" + price +
                ", siez=" + siez +
                ", status=" + status +
                ", logo=" + logo +
                '}';
    }
}

Logo类

public class Logo {
    private String name;
    private String color;

    public Logo(String name, String color) {
        this.name = name;
        this.color = color;
    }

    @Override
    public String toString() {
        return "Logo{" +
                "name='" + name + '\'' +
                ", color='" + color + '\'' +
                '}';
    }

    public String test(){
        System.out.println("test");
        return "test";
    }
}