factory-method

太过爱你忘了你带给我的痛 2023-07-18 04:46 49阅读 0赞

目录

1、概述

2、示例

创建User类

创建 factory-method 类

spring配置

spring引导类

运行结果

1、概述

factory-method：通过工厂类创建Spring bean。两种方式：一种静态方法，一种动态方法。

2、示例

创建User类

  1. package thinking.in.spring.boot.samples.spring5.bean;
  3. public class User {
  4.     private int id;
  5.     private String name;
  7.     public int getId() {
  8.         return id;
  9.     }
  11.     public void setId(int id) {
  12.         this.id = id;
  13.     }
  15.     public String getName() {
  16.         return name;
  17.     }
  19.     public void setName(String name) {
  20.         this.name = name;
  21.     }
  23.     @Override
  24.     public String toString() {
  25.         return "User{" +
  26.                 "id=" + id +
  27.                 ", name='" + name + '\'' +
  28.                 '}';
  29.     }
  30. }

创建 factory-method 类

  1. package thinking.in.spring.boot.samples.spring5.factorybean;
  3. import thinking.in.spring.boot.samples.spring5.bean.User;
  5. /**
  6.  * 演示 factory-method
  7.  */
  8. public class UserFactory {
  11.     public static User getStaticUser() throws Exception {
  12.         User user = new User();
  13.         user.setId(100);
  14.         user.setName("静态工厂方法创建User");
  15.         return user;
  16.     }
  18.     public User getDynamicUser() throws Exception {
  19.         User user = new User();
  20.         user.setId(200);
  21.         user.setName("动态工厂方法创建User");
  22.         return user;
  23.     }
  25. }

spring配置

  1. <!-- 静态 factory-method 示例 -->
  2.     <bean id="staticFactoryMethod" class="thinking.in.spring.boot.samples.spring5.factorybean.UserFactory"
  3.         factory-method="getStaticUser" />
  5.     <!-- 动态 factory-method 示例 -->
  6.     <bean id="userFactory" class="thinking.in.spring.boot.samples.spring5.factorybean.UserFactory" />
  7.     <bean id="dynamicFactoryMethod" factory-bean="userFactory"
  8.         factory-method="getDynamicUser" />

spring引导类

  1. package thinking.in.spring.boot.samples.spring5.bootstrap;
  3. import org.springframework.beans.factory.support.DefaultListableBeanFactory;
  4. import org.springframework.beans.factory.xml.XmlBeanFactory;
  5. import org.springframework.core.io.ClassPathResource;
  6. import thinking.in.spring.boot.samples.spring5.customlabel.CustomLabel;
  7. import thinking.in.spring.boot.samples.spring5.bean.User;
  8. import thinking.in.spring.boot.samples.spring5.factorybean.UserFactoryBean;
  10. public class XmlBeanFactoryBootstrap {
  12.     public static void main(String[] args) {
  13.         DefaultListableBeanFactory defaultListableBeanFactory = new XmlBeanFactory(new ClassPathResource("application-context.xml"));
  16.         /**
  17.          * factory-method
  18.          */
  19.         User staticUser = (User) defaultListableBeanFactory.getBean("staticFactoryMethod");
  20.         System.out.println("factory-method 实例化的User对象：" + staticUser);
  21.         User dynamicUser = (User) defaultListableBeanFactory.getBean("dynamicFactoryMethod");
  22.         System.out.println("factory-method 实例化的User对象：" + dynamicUser);
  24.     }
  25. }

运行结果

  1. factory-method 实例化的User对象：User{id=100, name='静态工厂方法创建User'}
  2. factory-method 实例化的User对象：User{id=200, name='动态工厂方法创建User'}

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