Spring表达式语言SpEL用法详解

package com.gong.spring.beans.spel;
public class Car {
 public Car() {
 }
 public Car(String name) {
  this.name = name;
 }
 private String name;
 //轮胎周长
 private double tyrePerimeter;
 private double price;}

package com.gong.spring.beans.spel;

public class Address {
 private String city;
 private String street;
}

package com.gong.spring.beans.spel;

public class Student {
 
 private String name;
 private int age;
 private double score;
 private String city;
 private String info;
 private Car car;
 private Address address;
}

<?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="com.gong.spring.beans.spel.Car" p:name="baoma"　　 p:tyrePerimeter="#{T(java.lang.Math).PI*80}"></bean>
 <bean id="address" class="com.gong.spring.beans.spel.Address" 
 p:city="武汉" p:street="#{'络南街道'}"></bean>

 <bean id="student" class="com.gong.spring.beans.spel.Student" p:name="tom"
 p:age="#{12}" p:score="#{99.00}"> 
  <!-- 使用spel引用其它的bean -->
  <property name="car" value="#{car}"></property>
  <!-- 使用spel引用其它bean的属性 -->
  <property name="city" value="#{address.city}"></property>
  <!-- 使用spel运算符 ，进行动态赋值-->
  <property name="info" value="#{car.price >300000 ? '有钱' : '没钱'}"></property>
 </bean>

</beans>

package com.gong.spring.beans.spel;

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

public class Main {
 public static void main(String[] args) {
  //1.创建spring的IOC容器对象
  ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-spel.xml");
  //2.从容器中获取Bean实例
  Student student = (Student) ctx.getBean("student");
  System.out.println(student.toString());
 }
}