一个项目中一般会出现多个环境的配置文件

在代码里我们可以通过下面的方法获取当前的环境。

1. 使用 @Value 注解直接获取

@Value("${spring.profiles.active}")
private String env;

2. 使用 @Configuration 注解

package com.example.demo.config;

import lombok.AllArgsConstructor;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Configuration;

@Configuration
@AllArgsConstructor
public class ProfileConfig {

    private final ApplicationContext applicationContext;

    /**
     * 获取当前环境
     */
    public String getActiveProfile() {
        return applicationContext.getEnvironment().getActiveProfiles()[0];
    }
}

3. 实现 ApplicationContextAware 接口

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 SpringUtils implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

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

    /**
     * 获取applicationContext
     */
    public static ApplicationContext getApplicationContext() {
        //判断是否为null
        if (applicationContext == null) {
            throw new IllegalStateException("applicationContext 未注入");
        }
        return 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);
    }

    /**
     * 获取当前环境
     */
    public static String getActiveProfile() {
        return getApplicationContext().getEnvironment().getActiveProfiles()[0];
    }
}