Spring Boot获取上下文环境方法

最新推荐文章于 2025-04-02 23:23:15 发布

JuneHwa

最新推荐文章于 2025-04-02 23:23:15 发布

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文章标签： Spring Boot

本文介绍了两种在Spring框架中获取ApplicationContext上下文的方法。第一种是通过实现ApplicationContextAware接口并在@Component注解的辅助下进行；第二种是通过静态SpringContextUtil工具类来实现。这两种方法都提供了获取Bean实例的功能。

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方法一：

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

@Component
public class ApplicationContextHolder implements ApplicationContextAware{
    // 上下文对象实例
    private static ApplicationContext applicationContext;

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

    public static ApplicationContext getApplicationContext(){
        return applicationContext;
    }

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

    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name){
        return (T)applicationContext.getBean(name);
    }

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

方法二：

import org.springframework.context.ApplicationContext;

public class SpringContextUtil {
    private static ApplicationContext applicationContext;

    public static ApplicationContext getApplicationContext(){
        return applicationContext;
    }

    public static void setApplicationContext(ApplicationContext applicationContext){
        SpringContextUtil.applicationContext = applicationContext;
    }

    public static <T> T getBean(String name){
        return (T)applicationContext.getBean(name);
    }

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

入口main函数：

public static void main(String[] args) {
        ApplicationContext context = SpringApplication.run(Application.class, args);
        SpringContextUtil.setApplicationContext(context);
    }