springboot应用获取spring上下文的4种方式

浅浅的花香味﹌ 2023-02-17 02:42 2阅读 0赞

实际开发中我们经常需要通过spring上下文获取一些配置信息，本文阐述springboot应用获取spring上下文的几种方式。

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### 文章目录 ###

*   *  方式一：实现ApplicationContextAware接口
     *  方式二：非static方法版
     *  方式三：在springboot引导类里设置
     *  方式四：直接注入ApplicationContext

## 方式一：实现ApplicationContextAware接口 ##

import org.springframework.beans.BeansException;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
    import org.springframework.stereotype.Component;
    
    /**
     * 实现ApplicationContextAware接口设置applicationContext
     * 提供static方法供调用者使用，不要求使用者受spring容器管理
     */
    @Component
    public class SpringContextUtil1 implements ApplicationContextAware {
    
        public static ApplicationContext applicationContext;
    
        @Override
        public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
            SpringContextUtil1.applicationContext = applicationContext;
        }
    
        public static ApplicationContext getApplicationContext() {
            return SpringContextUtil1.applicationContext;
        }
    
        public static Object getBean(String name) {
            return getApplicationContext().getBean(name);
        }
    
        public static <T> T getBean(Class<T> clazz) {
            return getApplicationContext().getBean(clazz);
        }
    
        public static <T> T getBean(String name, Class<T> clazz) {
            return getApplicationContext().getBean(name, clazz);
        }
    }

## 方式二：非static方法版 ##

import org.springframework.beans.BeansException;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
    import org.springframework.stereotype.Component;
    
    /**
     * 实现ApplicationContextAware接口设置applicationContext
     * 如果使用者也是被spring管理的bean则可以使用注入的方式使用,而非调用static方法
     */
    @Component
    public class SpringContextUtil2 implements ApplicationContextAware {
    
        public ApplicationContext applicationContext;
    
        @Override
        public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
            this.applicationContext = applicationContext;
        }
    
        public ApplicationContext getApplicationContext() {
            return this.applicationContext;
        }
    
        public Object getBean(String name) {
            return applicationContext.getBean(name);
        }
    
        public <T> T getBean(Class<T> clazz) {
            return applicationContext.getBean(clazz);
        }
    
        public <T> T getBean(String name, Class<T> clazz) {
            return getApplicationContext().getBean(name, clazz);
        }
    }
    
    
    @Component
    public class ContextUser{
    
        /**
         * 使用者直接注入
         */
        @Autowired
        public SpringContextUtil2 springContextUtil2;
     
    }

## 方式三：在springboot引导类里设置 ##

import org.springframework.context.ApplicationContext;
    
    /**
     * 在springboot引导类里设置applicationContext
     * 工具类无需实现ApplicationContextAware接口
     */
    
    public class SpringContextUtil3 {
    
        public static ApplicationContext applicationContext;
    
        public static ApplicationContext getApplicationContext() {
            return SpringContextUtil3.applicationContext;
        }
    
        public static void setApplicationContext(ApplicationContext applicationContext) {
            SpringContextUtil3.applicationContext = applicationContext;
        }
    
        public static Object getBean(String name) {
            return getApplicationContext().getBean(name);
        }
    
        public static Object getBean(Class<?> requiredType) {
            return getApplicationContext().getBean(requiredType);
        }
    
        public static <T> T getBean(String name, Class<T> clazz) {
            return getApplicationContext().getBean(name, clazz);
        }
    }
    
    
    //在springboot引导类里设置applicationContext
    @SpringBootApplication
    public class MainApplication {
    
        public static void main(String[] args) {
            ConfigurableApplicationContext context = SpringApplication.run(MainApplication.class, args);
            SpringContextUtil3.setApplicationContext(context);
        }
    }

## 方式四：直接注入ApplicationContext ##

@Component
    public class ContextUser{
    
        /**
         * 在需要使用上下文的地方直接注入(前提：使用者受spring容器管理)
         */
       @Autowired
       public ApplicationContext applicationContext;
     
    }

怎么样，第四种方式是不是很easy？！

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[https_blog.csdn.net_hellozpc_article_details_109413465]: https://blog.csdn.net/hellozpc/article/details/109413465
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[https_blog.csdn.net_hellozpc_article_details_108248227]: https://blog.csdn.net/hellozpc/article/details/108248227
[https_blog.csdn.net_hellozpc_article_details_107582771]: https://blog.csdn.net/hellozpc/article/details/107582771
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