Spring_SqEL的介绍

下面就以一个例子去说明Spring_SqEL

beans-spel.xml的代码：

<?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:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"><bean id="address" class="Address"><property name="city" value="beijing"></property><property name="street" value="zhonghuajie"></property></bean><bean id="car" class="Car"><property name="brand" value="baoma" ></property><property name="price" value="100000.00"></property><property name="tyrePerimeter" value="#{T(java.lang.Math).PI * 80}"></property></bean><bean id="person" class="Person"><property name="name" value="#{'chen'}"></property><property name="aqe" value="#{23}"></property><property name="car" value="#{car}"></property><property name="info"  value="#{car.price > 99999.00 ? '金领':'白领'}"></property><property name="address" value="#{address.city}"></property></bean>
</beans>

Car类的代码：

public class Car {public String brand;public double price;public double tyrePerimeter;public String getBrand() {return brand;}public void setBrand(String brand) {this.brand = brand;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public double getTyrePerimeter() {return tyrePerimeter;}public void setTyrePerimeter(double tyrePerimeter) {this.tyrePerimeter = tyrePerimeter;}@Overridepublic String toString() {return "Car{" +"brand='" + brand + '\'' +", price=" + price +", tyrePerimeter=" + tyrePerimeter +'}';}
}

Address类的代码：

public class Address {public String city;public 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;}@Overridepublic String toString() {return "Address{" +"address='" + city + '\'' +", street='" + street + '\'' +'}';}
}

Person类的代码：

public class Person {public String name;public int aqe;public String address;public String info;public Car car;public String getInfo() {return info;}public void setInfo(String info) {this.info = info;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAqe() {return aqe;}public void setAqe(int aqe) {this.aqe = aqe;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}public Car getCar() {return car;}public void setCar(Car car) {this.car = car;}@Overridepublic String toString() {return "Person{" +"name='" + name + '\'' +", aqe=" + aqe +", address=" + address +", info='" + info + '\'' +", car=" + car +'}';}
}

Main类的代码：

import java.sql.SQLException;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class Main {public static void main(String[] args) throws SQLException {ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-spel.xml");Person person = (Person) ctx.getBean("person");System.out.println(person);/*Person per = (Person) ctx.getBean ("per");System.out.println (per);*/}}

输出的结果：

Person{name='chen', aqe=23, address=beijing, info='金领', car=Car{brand='baoma', price=100000.0, tyrePerimeter=251.32741228718345}}

视频对xml的解析：如图:

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