DependsOn注解

DependsOn注解可以让我们在某个bean依赖另外一个bean的时候先加载另外一个bean，如下在控制台可以看到b类先被注入

package com.testGetBean;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.DependsOn;
import org.springframework.stereotype.Component;
@Component
@DependsOn("b")
public class A {
    private Logger logger = LoggerFactory.getLogger(getClass());
    public A() {
        System.out.println("A");
        logger.info("我是A我被实例化啦");
    }
    public void display() {
        System.out.println("A    dispaly");
    }
}

package com.testGetBean;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
@Component
public class B {
    private Logger logger = LoggerFactory.getLogger(getClass());
    public B() {
        System.out.println("B");
        logger.info("我是B我被实例化啦");
    }
    public void display() {
        System.out.println("b    dispaly");
    }
}