Spring通过@Lazy解决构造方法形式的循环依赖问题
作者：amadeus_liu2
这篇文章主要给大家介绍了Spring如何通过@Lazy解决构造方法形式的循环依赖问题,文中有详细的代码示例,对大家的学习活工作有一定的帮助,具有一定的参考价值,需要的朋友可以参考下
一、定义2个循环依赖的类
package cn.edu.tju.domain2;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Component;
@Component
public class A {
private final B b;
public B getB() {
return b;
}
@Lazy
public A(B b){
this.b = b;
//System.out.println(b);
}
}package cn.edu.tju.domain2;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Component;
@Component
public class B {
private final A a;
public A getA() {
return a;
}
@Lazy
public B(A a){
this.a =a;
//System.out.println(a);
}
}二、定义配置文件（spring09.xml)：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="cn.edu.tju.domain2"/>
</beans>三、定义测试类：
package cn.edu.tju;
import cn.edu.tju.domain.Husband;
import cn.edu.tju.domain2.A;
import cn.edu.tju.domain2.B;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidPooledConnection;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.ConfigurationClassPostProcessor;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.sql.SQLException;
public class Test09 {
public static void main(String[] args) throws Exception {
ConfigurableApplicationContext ctx = new ClassPathXmlApplicationContext("spring09.xml");
A a = ctx.getBean("a", A.class);
B b = ctx.getBean("b", B.class);
System.out.println(a.getClass().getName());
System.out.println(a.getB().getA() == a);
System.out.println(a.getB().getClass().getName());
System.out.println(b.getA().getClass().getName());
}
}四、执行结果：
以上就是Spring通过@Lazy解决构造方法形式的循环依赖问题的详细内容，更多关于Spring @Lazy解决循环依赖的资料请关注脚本之家其它相关文章！