优雅获取ApplicationContext上下文对象，ApplicationContextUtil上下文获取工具类

最新推荐文章于 2023-02-02 16:26:31 发布

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最新推荐文章于 2023-02-02 16:26:31 发布

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分类专栏： Spring 文章标签： java编程 spring框架学习 spring应用上下文 java获取容器中bean对象通过类名获取对象

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1 篇文章

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本文主要介绍在Java编程中，借助Spring框架获取容器中Bean对象的方法。具体包括实现ApplicationContextAware接口来获取上下文对象，以及利用SpringBoot启动类的setApplicationContext方法获取上下文对象，还提及了应用上下文帮助类。

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文章目录

一、实现接口实现ApplicationContextAware接口获取上下文对象
二、SpringBoot启动类setApplicationContext获取上下文对象

提示：以下是本篇文章正文内容，下面案例可供参考

一、实现接口实现ApplicationContextAware接口获取上下文对象

package com.example.demo.config;

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

@Component
public class ApplicationContextUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

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

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

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

二、SpringBoot启动类setApplicationContext获取上下文对象

①SpringBoot启动类

package com.example.demo;

import com.example.demo.config.ApplicationContextUtil2;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@SpringBootApplication
@EnableTransactionManagement
@MapperScan("com.example.demo.mapper")
public class DemoApplication {

	public static void main(String[] args) {
		ApplicationContext applicationContext = SpringApplication.run(DemoApplication.class, args);
		//设置上下文工具类中对象
		ApplicationContextUtil2.setApplicationContext(applicationContext);
	}

}

②ApplicationContext应用上下文帮助类

package com.example.demo.config;

import org.springframework.context.ApplicationContext;

public class ApplicationContextUtil2 {

    private static ApplicationContext applicationContext;

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

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

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