本文主要是介绍Spring FactoryBean，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
Spring FactoryBean 是创建 复杂的bean，一般的bean 直接用xml配置即可，如果一个bean的创建过程中涉及到很多其他的bean 和复杂的逻辑，用xml配置比较困难，这时可以考虑用FactoryBean
例子如下：
1：创建一个Car类（是为了简便）一般不能直接给出Car类，如果是这样直接注入就可以或者Car对象了，这里只是为了简便。
package com.myapp.core.factorybean;public class Car {private String make;private int year;public String getMake() {return make;}public void setMake(String make) {this.make = make;}public int getYear() {return year;}public void setYear(int year) {this.year = year;}}
2：一个FactoryBean的实现拥有创建car
package com.myapp.core.factorybean;import org.springframework.beans.factory.FactoryBean;public class MyCarFactoryBean implements FactoryBean<Car>{private String make;private int year;public void setMake(String make) {this.make = make;}public void setYear(int year) {this.year = year;}@Overridepublic Car getObject() throws Exception {// TODO Auto-generated method stub//Here is a complex car object created// wouldn't be a very useful FactoryBean// if we could simply instantiate the object!Car car = new Car();if(year != 0){car.setYear(this.year);}if("make".equals(make)){car.setMake("we are making bla bla bla");}else{car.setMake(this.make);}return car;}@Overridepublic Class<?> getObjectType() {// TODO Auto-generated method stubreturn Car.class;}@Overridepublic boolean isSingleton() {// TODO Auto-generated method stubreturn false;}}
以上中创建car太简单了，如果太简单就没有必要用FactoryBean创建了，可以写的复杂些。
3：Person 引用一个car
package com.myapp.core.factorybean;public class Person {private Car car;public Car getCar() {return car;}public void setCar(Car car) {this.car = car;}public String toString(){return car.getMake()+"::::"+car.getYear();}
}
4：配置引用xml格式：
<bean id="car" class="com.myapp.core.factorybean.MyCarFactoryBean"><property name="make" value="makeing car"/><property name="year" value="123"/></bean><bean id="person" class="com.myapp.core.factorybean.Person"><property name="car" ref="car"/></bean>5：编写测试类测试：
package com.myapp.core.factorybean;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class MainTest {public static void main(String[] args) {ApplicationContext context = new ClassPathXmlApplicationContext("resource/others.xml");Person person = (Person)context.getBean("person");// Car car = (Car)context.getBean("car");// System.out.println(car);System.out.println(person);
}
}
测试结果 makeing car::::123
利用FactoryBean创建car成功
只是为了说明思想。因为这个接口太重要了。在Spring中有很多类实现了改接口over
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