Spring Boot獲取上下文環境方法

原創

2020-02-20 20:36

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{
    // 上下文對象實例
    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函數：

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