package calleePackage;

/**
 * 這個是被非單例模式的bean
 */
public class Callee {

    private String calleeName;

    public String getCalleeName() {
        return calleeName;
    }

    public void setCalleeName(String calleeName) {
        this.calleeName = calleeName;
    }




}
 

package callerPackage;

import calleePackage.Callee;

/**
 * 這個是單例模式的bean
 */

public class Caller {

    private Callee callee;

    public Callee getCallee() {
        return callee;
    }

    public void setCallee(Callee callee) {
        this.callee = callee;
    }

    public String whoIsMyCallee(){
        return "my callee is " + getCallee().toString();
    }
}
 

<?xml version="1.0" encoding="GBK"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans-4.0.xsd">

    <!--就是通過lookup-method標籤來讓spring知道哪個方法需要新的非單例模式的bean啦~~-->
    <bean id="caller" class="callerPackage.Caller">
        <lookup-method name="getCallee" bean="callee"/>
    </bean>

<!--spring在預設情況下是將bean設定為單例模式的bean的。要顯式指定scope="prototype"
才會得到非單例模式的bean-->
    <bean id="callee" class="calleePackage.Callee" scope="prototype">
        <property name="calleeName" value="lala"/>
    </bean>

</beans>
 

package testPackage;

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

public class SpringTest {
    public static void main(String []args){
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
        Caller caller1 = applicationContext.getBean("caller", Caller.class);
        Caller caller2 = applicationContext.getBean("caller", Caller.class);
        System.out.println(caller1 == caller2);
//        caller1和caller2是相等的。

        System.out.println(caller1.whoIsMyCallee());
        System.out.println(caller2.whoIsMyCallee());

        System.out.println(caller1.getCallee() == caller2.getCallee());
//        caller1的callee和caller2的callee是不等的
    }
}
//執行程式可以看到輸出
//        true
//        my callee is [email protected]
//        my callee is [email protected]
//        false

這是我看李剛編著的《輕量級javaEE企業應用實戰（第五版）-Struts2+Spring5+Hibernate5/JAP2》後總結出來的。