SpringContextHolder直接从spring容器中获取bean_springcontextholder 指定名称从容器中获取对象-优快云博客

本文链接：https://blog.youkuaiyun.com/jasnet_u/article/details/119214625

本文介绍了如何通过SpringContextHolder类便捷地从Spring容器中获取bean，提供静态方法获取指定名称或类型的bean实例，适用于Spring框架下的快速bean访问示例。

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SpringContextHolder直接从spring容器中获取bean

创建类 SpringContextHolder

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
 
@Component
public class SpringContextHelper implements ApplicationContextAware {
    private static ApplicationContext applicationContext;
 
    @Override
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        SpringContextHelper.applicationContext = applicationContext;
    }
 
    public static ApplicationContext getApplicationContext(){
        return applicationContext;
    }
 
    public static Object getBean(String name){
        return applicationContext.getBean(name);
    }
    /**
     * 从spring 上下文中获取bean
     * @param name
     * @param requiredClass
     * @return
     */
    public static <t> T getBean(String name, Class<t>  requiredClass){
        return applicationContext.getBean(name, requiredClass);
    }
    public  static <t> T getBean(Class<t> requiredType){
        return applicationContext.getBean(requiredType);
    }
 
}

使用示例 :

MyService myService= SpringContextHolder.getBean(MyService.class);
String s=myService.hello("张三");
System.out.println(s);

MyService 是托管自spring容器中的bean 。在任意对象的方法代码中都可以使用SpringContextHolder类的静态方法获取spring容器中的bean .