Spring学习笔记03-SpEL、Factory

一、Spring中的SpEL（表达式语言）

package spel;

public class Car {
    private String name;
    private double price;
    private double tp;//轮胎周长
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public double getPrice() {
        return price;
    }
    public void setPrice(double price) {
        this.price = price;
    }
    public double getTp() {
        return tp;
    }
    public void setTp(double tp) {
        this.tp = tp;
    }
    @Override
    public String toString() {
        return "Car [name=" + name + ", price=" + price + ", tp=" + tp + "]";
    }
    

}
Car.java
package spel;

public class Address {
    private String city;
    private String home;
    public String getCity() {
        return city;
    }
    public void setCity(String city) {
        this.city = city;
    }
    public String getHome() {
        return home;
    }
    public void setHome(String home) {
        this.home = home;
    }
    @Override
    public String toString() {
        return "Address [city=" + city + ", home=" + home + "]";
    }
    
    
    

}
Address.java
package spel;

public class Person {
    private String name;
    private Car cars;
    private String city;
    private String info;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Car getCars() {
        return cars;
    }
    public void setCars(Car cars) {
        this.cars = cars;
    }
    public String getCity() {
        return city;
    }
    public void setCity(String city) {
        this.city = city;
    }
    public String getInfo() {
        return info;
    }
    public void setInfo(String info) {
        this.info = info;
    }
    @Override
    public String toString() {
        return "Person [name=" + name + ", cars=" + cars + ", city=" + city + ", info=" + info + "]";
    }

    

}
Person.java
<?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">
    <!-- 使用spring赋值 -->
    <bean id="address" class="spel.Address">
        <property name="city" value="#{'beijing'}"></property>
        <property name="home" value="#{'mmm'}"></property>
    </bean>
    <bean id="car" class="spel.Car">
        <property name="name" value="audi"></property>
        <property name="price" value="122"></property>
        <property name="tp" value="#{T(Math).PI*80}"></property>
    </bean>
    <bean id="person" class="spel.Person">
        <!-- 使用spel引用bean -->
        <property name="name" value="小白"></property>
        <property name="cars" value="#{car}"></property>
        <property name="city" value="#{address.city}"></property>
        <property name="info" value="#{car.price>30 ? '金'  :'白'}"></property>
    </bean>
</beans>
spel.xml
package spel;

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


public class Main {

    public static void main(String[] args) {
        ApplicationContext c=new ClassPathXmlApplicationContext("spel.xml");
        Address ad=(Address) c.getBean("address");
        System.out.println(ad);
        Car car=(Car) c.getBean("car");
        System.out.println(car);
        Person pe=(Person) c.getBean("person");
        System.out.println(pe);

    }

}
Main .java

二、通过工厂方法配置bean

package factory;

public class Car {
    private String name;
    private int price;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getPrice() {
        return price;
    }
    public void setPrice(int price) {
        this.price = price;
    }
    @Override
    public String toString() {
        return "Car [name=" + name + ", price=" + price + "]";
    }
    public Car(String name, int price) {
        super();
        this.name = name;
        this.price = price;
    }
    

}
Car.java
package factory;

import java.util.HashMap;
import java.util.Map;
//实例工厂的方法
public class Factory {

    private static Map<String, Car> cars = null;

    public Factory() {
        cars = new HashMap<String, Car>();
        cars.put("baoma", new Car("baoma", 300));
        cars.put("xxx", new Car("xxx", 200));
    }

    public Car getCar(String name) {
        
        return cars.get(name);
    }

}
Factory .java
package factory;

import java.util.HashMap;
import java.util.Map;

public class StaticFactory {
    
    private static Map<String,Car>cars=new HashMap<String,Car>();
    
    static {
        cars.put("baoma", new Car("baoma",300));
        cars.put("xxx", new Car("xxx",200));
    }
    public static Car getCar(String name){
        return cars.get(name);
    }

}
StaticFactory.java
<?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">
    <!-- 通过静态工厂方法配置bean -->
    <bean id="car" class="factory.StaticFactory"
        factory-method="getCar">
        <constructor-arg value="baoma"></constructor-arg>
    </bean>
    <!-- 配置工厂的实例 -->
    <bean id="car1" class="factory.Factory"></bean>
    <!-- 通过实例工厂配置bean -->
    <bean id="car2" factory-bean="car1" factory-method="getCar">
        <constructor-arg value="xxx"></constructor-arg>
    </bean>
</beans>
factory.xml
package factory;

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

public class Main {

    public static void main(String[] args) {

        ApplicationContext c=new ClassPathXmlApplicationContext("factory.xml");
        Car car=(Car) c.getBean("car");
        System.out.println(car);
        Car car2=(Car) c.getBean("car2");
        System.out.println(car2);
    }

}
Main.java

三、通过factorybean配置bean

package factorybean;

public class Car {
    private String name;
    private int price;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getPrice() {
        return price;
    }
    public void setPrice(int price) {
        this.price = price;
    }
    @Override
    public String toString() {
        return "Car [name=" + name + ", price=" + price + "]";
    }
    public Car(String name, int price) {
        super();
        this.name = name;
        this.price = price;
    }
    

}
Car .java
package factorybean;

import org.springframework.beans.factory.FactoryBean;

import factorybean.Car;

public class CarFactoryBean implements FactoryBean<Car> {
    private String name;
    public void setName(String name) {
        this.name=name;
    }

    //返回bean对象
    @Override
    public Car getObject() throws Exception {
        // TODO 自动生成的方法存根
        return new Car(name,55);
    }
    //返回bean类型
    @Override
    public Class<?> getObjectType() {
        // TODO 自动生成的方法存根
        return Car.class;
    }
    @Override
    public boolean isSingleton() {
        return true;
    }
}
CarFactoryBean .java
<?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="factorybean.CarFactoryBean">
<property name="name" value="baoma"></property>
</bean>
</beans>
cfactorybean.xml
package factorybean;

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

public class Main {

    public static void main(String[] args) {

        ApplicationContext c=new ClassPathXmlApplicationContext("cfactorybean.xml");
        Car car=(Car) c.getBean("car");
        System.out.println(car);
    }

}
Main .java

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原文地址：https://www.cnblogs.com/MoooJL/p/12662822.html