Spring中的SPEL

src\dayday\Person.java

package dayday;

/**
 * Created by I am master on 2016/11/28.
 */
public class Person {
    private String name;
    private int age;
    private String city;
    private Car car;
    public void setName(String name){
        this.name=name;
    }
    public void setAge(int age){
        this.age=age;
    }
    public void setCity(String city){
        this.city=city;
    }
    public void setCar(Car car){
        this.car=car;
    }
   public void toprint(){
       System.out.println("["+"name="+name+" age="+age+" car="+car+" city="+city+"]");
   }
}

src\dayday\City.java

package dayday;

/**
 * Created by I am master on 2016/11/28.
 */
public class City {
    private String livecity;
    private String street;
    public void setLivecity(String livecity) {
        this.livecity=livecity;
    }
    public void setStreet(String street){
        this.street=street;
    }
    public String getLivecity(){
        return livecity;
    }
    public String getStreet(){
        return street;
    }
    public void printinfo(){
        System.out.println("["+"city="+livecity+" street="+street +"]");
    }
}

src\dayday\Car.java

package dayday;

/**
 * Created by I am master on 2016/11/28.
 */
public class Car {
    private String name;
    private double tyrepremeter;
    public void setName(String name){
        this.name=name;
    }
    public String getName(){
        return name;
    }
    public void setTyrepremeter(double tyrepremeter){
        this.tyrepremeter=tyrepremeter;
    }
    public double getTyrepremeter(){
        return tyrepremeter;
    }
    public String toString(){
        return "["+"carname="+name+"]";
    }

}

src\dayday\Main.java

package dayday;

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

/**
 * Created by I am master on 2016/11/28.
 */
public class Main {
    public static void main(String[] args){
       ApplicationContext ctx=new ClassPathXmlApplicationContext("beans.xml");
       Person person=ctx.getBean("person",Person.class);
       person.toprint();

    }
}

src\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" xmlns:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
       <bean id="car" class="dayday.Car">
           <!--使用spel为属性附一个字面值-->
           <property name="name" value="#{'Audi'}"></property>
           <!--使用spel引用类的静态属性-->
           <property name="tyrepremeter" value="#{T(java.lang.Math).PI*80}"></property>
       </bean>
       <bean name="city" class="dayday.City">
           <property name="livecity" value="#{'shaoxing'}"></property>
           <property name="street" value="#{'xinchang'}"></property>
       </bean>
       <bean id="person" class="dayday.Person">
           <property name="name" value="dayday"></property>
           <!--使用spel引用其他的bean-->
           <property name="car" value="#{car}"></property>
           <!--使用spel引用其他的bean的其他属性-->
           <property name="city" value="#{city.livecity}"></property>
           <property name="age" value="#{17}"></property>
       </bean>
</beans>

运行结果
[name=dayday age=17 car=[carname=Audi] city=shaoxing]

SPEL的作用：
1：引用其他bean和ref作用差不多
2：引用其他bean的属性/方法
3：调用静态方法和静态属性
4：字面值