Spring的实例工厂方法和静态工厂方法都可以用来实例化bean，本文我们就来看看相关实例。
静态工厂方法：直接调用静态方法可以返回Bean的实例
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
package com.zhu.string.factory; import java.util.HashMap; import java.util.Map; public class StaticCarFactory { /** * 静态工厂方法：直接调用静态方法可以返回Bean的实例 * */ private static Map<String ,Car > cars=new HashMap<String , Car>(); static{ cars.put("audi", new Car(3000, "aodi")); cars.put("fodo", new Car(3000, "aodi")); } //静态工厂方法 public static Car getCar(String name){ return cars.get(name); } } |
实例工厂方法。即调用工厂本身，再调用工厂的实例方法来返回bean实例
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
package com.zhu.string.factory; import java.util.HashMap; import java.util.Map; public class InstanceCarFactory { /** * 实例工厂方法。即调用工厂本身，再调用工厂的实例方法来返回bean实例 */ private Map<String ,Car> cars=null; public InstanceCarFactory() { // TODO Auto-generated constructor stub cars=new HashMap<String, Car>(); cars.put("audi", new Car(1000,"audi")); cars.put("dffdas", new Car(2000,"audi")); } public Car getCar(String brand){ return cars.get(brand); } } |
beans-factory.xml
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
<span style="font-size:14px;"><?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"> <!-- 通过静态方法来配置bean,注意不是配置静态工厂方法实例，而是配置bean实例 --> <!-- class属性：指向静态方法的全类名 factory-method：指向静态方法的名字 constructor-arg:如果工厂方法需要传入参数，则使用constructor-arg来配 置参数 --> <bean id="car1" factory-method="getCar" class="com.zhu.string.factory.StaticCarFactory"> <constructor-arg value="audi"></constructor-arg> </bean> <!-- 配置工厂的实例 --> <bean id="carFactory" class="com.zhu.string.factory.InstanceCarFactory"> </bean> <bean id="car2" factory-bean="carFactory" factory-method="getCar"> <constructor-arg value="audi"></constructor-arg> </bean> </beans></span> |
Car.java实体类
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
package com.zhu.string.factory;public class Car { private double price; private String brand; public double getPrice() { return price; } public void setPrice(double price) { this.price = price; } public String getBrand() { return brand; } public void setBrand(String brand) { this.brand = brand; } @Override public String toString() { return "Car [brand=" + brand + ", price=" + price + "]"; } public Car(){ System.out.println("cars....constructor"); } public Car(double price, String brand) { super(); this.price = price; this.brand = brand; }} |
Main.java
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
package com.zhu.string.factory;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Main { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub ApplicationContext cx=new ClassPathXmlApplicationContext("beans- factory.xml"); Car car1=(Car) cx.getBean("car1"); System.out.println(car1); Car car2=(Car) cx.getBean("car2"); System.out.println(car2); }} |
运行结果：
Car [brand=aodi, price=3000.0]
Car [brand=audi, price=1000.0]
总结
以上就是本文关于Spring的实例工厂方法和静态工厂方法实例代码的全部内容，希望对大家有所帮助。感兴趣的朋友可以继续参阅本站其他相关专题，如有不足之处，欢迎留言指出。感谢朋友们对本站的支持！
原文链接：http://blog.csdn.net/zhupengqq/article/details/51799320
