當A和B的service互相呼叫的時候，容易引發迴圈依賴。這時候需要不使用注入。

package com.uplus.wei;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringContextUtils implements ApplicationContextAware {
    public static ApplicationContext applicationContext = null;

    @Override
    public void setApplicationContext(
            ApplicationContext applicationContext) throws BeansException {
        if (SpringContextUtils.applicationContext == null) {
            SpringContextUtils.applicationContext = applicationContext;
        }
    }

    // 獲取applicationContext
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    public static <T> T getBean(
            Class<T> clazz) {
        return getApplicationContext().getBean(clazz);
    }

    public static Object getBean(
            String name) {
        return getApplicationContext().getBean(name);
    }

    public static <T> T getBean(
            String name,
            Class<T> requiredType) {
        return getApplicationContext().getBean(name, requiredType);
    }

    public static boolean containsBean(
            String name) {
        return getApplicationContext().containsBean(name);
    }

    public static boolean isSingleton(
            String name) {
        return getApplicationContext().isSingleton(name);
    }

    public static Class<? extends Object> getType(
            String name) {
        return getApplicationContext().getType(name);
    }
}
 

可以通過這個類來獲取其中一個service的類

WxMpUser weixinuser = SpringContextUtils.getBean(WxMpService.class).getUserService().userInfo(openId);

 異常資訊

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'wechatMpConfiguration':