spring 使用spel

1.car类

package com.hxzy;

public class Car {

private String brand;

private String address;

private int speed;

private double perimeter;

public void setBrand(String brand) {

this.brand = brand;

}

public void setAddress(String address) {

this.address = address;

}

public void setSpeed(int speed) {

this.speed = speed;

}

public void setPerimeter(double perimeter) {

this.perimeter = perimeter;

}

public double getPerimeter() {

return perimeter;

}

public Car() {

}

public Car(String brand, String address, int speed) {

super();

this.brand = brand;

this.address = address;

this.speed = speed;

}

@Override

public String toString() {

return "Car [brand=" + brand + ", address=" + address + ", speed="

+ speed + ", perimeter=" + perimeter + "]";

}

}

2.person类

package com.hxzy;

public class Person {

private String name;

private Car car;

private String city;

//根据car的xx确定info

private String info;

public void setName(String name) {

this.name = name;

}

public void setCar(Car car) {

this.car = car;

}

public void setCity(String city) {

this.city = city;

}

public void setInfo(String info) {

this.info = info;

}

public Person(String name, Car car, String city, String info) {

super();

this.name = name;

this.car = car;

this.city = city;

this.info = info;

}

public Person() {

}

@Override

public String toString() {

return "Person [name=" + name + ", car=" + car + ", city=" + city

+ ", info=" + info + "]";

}

}

3.address类

package com.hxzy;

public class Address {

private String city;

private String street;

public String getCity() {

return city;

}

public void setCity(String city) {

this.city = city;

}

public String getStreet() {

return street;

}

public void setStreet(String street) {

this.street = street;

}

@Override

public String toString() {

return "Address [city=" + city + ", street=" + street + "]";

}

public Address(String city, String street) {

super();

this.city = city;

this.street = street;

}

public Address() {

super();

}

}

4.bean配置类

<?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 id="car" class="com.hxzy.Car">

<!-- 使用spel赋值字符串 -->

<property name="brand" value="#{'雪佛兰'}"></property>

<property name="address" value="上汽"></property>

<property name="speed" value="#{'210'}"></property>

<!-- 使用spel引用类的静态属性 -->

<property name="perimeter" value="#{T(java.lang.Math).PI * 80}"></property>

</bean>

<bean id="address" class="com.hxzy.Address">

<property name="city" value="#{'郑州'}"></property>

<property name="street" value="#{'南阳路'}"></property>

</bean>

<bean id="person" class="com.hxzy.Person">

<property name="name" value="快乐的人"></property>

<property name="car" value="#{car}"></property>

<!-- 使用spel引用其他bean的属性 #{car.address}用法错误，不知为何报错？ -->

<!--property name="city" value="#{car.address}"></property-->

<property name="city" value="#{address.city}"></property>

<!-- property name="city" value="合肥"></property-->

<!-- spel使用运算符 -->

<!--使用如下方式时提示错误Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 4): Field or property 'speed' cannot be found on object of type 'com.hxzy.Car' ，不知为何？-->

<!-- property name="info" value="#{car.speed > 200 ? '好车' : '普通车'}"></property-->

<!--使用如下方式时正确-->

<property name="info" value="#{address.street.equals('南阳路') ? '合资车' : '垃圾车'}"></property>

<!--property name="info" value="好车"></property-->

</bean>

</beans>

5.测试类

AbstractApplicationContext ctx = new ClassPathXmlApplicationContext("spel.xml");

Car car = (Car) ctx.getBean("car");

System.out.println(car);

Address address = (Address) ctx.getBean("address");

System.out.println(address);

Person man = (Person) ctx.getBean("person");

System.out.println(man);

ctx.close();