Spring 循环依赖之单例模式

package com.xunhuan;
public class DemoA {
    private DemoB b;
    public DemoB getB() {
        return b;
    }
    public void setB(DemoB b) {
        this.b = b;
    }
    public DemoA(){
        System.out.println(" ---DemoA created success ");
    }
}

package com.xunhuan;
public class DemoB {
    private DemoA a;
    public DemoA getA(){
        return a;
    }
    public void setA(DemoA a) {
        this.a = a;
    }
    public DemoB(){
        System.out.println(" ----DemoB created success");
    }
}

<?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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-3.0.xsd">
    <bean name="a" class="com.xunhuan.DemoA" scope="singleton">
        <property name="b" ref="b" />
    </bean>
    <bean name="b" class="com.xunhuan.DemoB" scope="singleton">
        <property name="a" ref="a" />
    </bean>
</beans>

package com.xunhuan;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class CilentSpringContainer {
    public static void main(String[] args) {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
        DemoA a = applicationContext.getBean("a", DemoA.class);
        DemoB b = applicationContext.getBean("b", DemoB.class);
    }
}

<?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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-3.0.xsd">
    <bean name="a" class="com.xunhuan.DemoA" scope="singleton">
        <property name="b" ref="b" />
    </bean>
    <bean name="b" class="com.xunhuan.DemoB" scope="singleton">
        <property name="a" ref="a" />
    </bean>
</beans>

<?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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-3.0.xsd">
    <bean name="a" class="com.xunhuan.DemoA" scope="prototype">
        <property name="b" ref="b" />
    </bean>
    <bean name="b" class="com.xunhuan.DemoB" scope="prototype">
        <property name="a" ref="a" />
    </bean>
</beans>