springboot加载配置文件profiles

刺骨的言语ヽ痛彻心扉 2022-11-11 05:56 330阅读 0赞

### 一、springboot动态加载服务器上的配置文件 ###

springboot利用EnvironmentPostProcessor接口来动态加载配置文件

具体实现步骤

服务器目录下有个配置文件，如下图，我们要实现动态加载到springboot中，并取得里面的配置springboot.name=springboot

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA_size_16_color_FFFFFF_t_70][]

实现接口EnvironmentPostProcessor

package com.lsl.controller;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.env.EnvironmentPostProcessor;
    import org.springframework.core.env.ConfigurableEnvironment;
    import org.springframework.core.env.PropertiesPropertySource;
    import org.springframework.stereotype.Component;
    
    import java.io.FileInputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.Properties;
    
    @Component
    public class MyEnvironmentPostProcessor implements EnvironmentPostProcessor {
        @Override
        public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
            try{
                InputStream input = new FileInputStream("D:/temp/springboot.properties");
                Properties source = new Properties();
                source.load(input);
                PropertiesPropertySource propertySource = new PropertiesPropertySource("my",source);
                environment.getPropertySources().addLast(propertySource);
            }catch (IOException e){
                e.printStackTrace();
            }
        }
    }

在启动类里读取该配置内容，当然也可以在其他地方读取，参考上篇blog[https://blog.csdn.net/dhklsl/article/details/114985492][https_blog.csdn.net_dhklsl_article_details_114985492]

输出结果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA_size_16_color_FFFFFF_t_70 1][]

### 二、springboot激活指定的配置文件profile ###

我们知道，在实际的项目开发中，一般会有多套配置文件，比如开发环境一套，测试环境一套，生产环境一套。如果激活指定的profile呢？

假如现在有3个配置文件，

一个是默认的配置文件application.properties，里面配置的是公共信息，也就是在任何环境都一样的配置信息

>                 
> 
>     ds.name=lsl
>     ds.password=123456

第二个是开发环境配置文件application-dev.properties，里面配置的是开发环境的数据库连接

>            
> 
>     jdbc.url=mysql:/jdbc://127.0.0.1/db_test

第三个是测试环境的配置文件application-test.properties，配置的是测试环境的数据库连接

>             
> 
>     jdbc.url=mysql:/jdbc://127.0.0.1/db_dev

现在怎么指定激活开发环境的application-dev.properties配置文件呢?

**第一种方式：通过命令参数激活**

--spring.profiles.active=dev

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA_size_16_color_FFFFFF_t_70 2][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA_size_16_color_FFFFFF_t_70 3][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA_size_16_color_FFFFFF_t_70 4][]

**命令参数方式激活多个配置文件 --spring.profiles.active=dev,test**

**第二种方式：通过程序激活**

我们通过程序激活test配置文件，

package com.lsl;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.context.ConfigurableApplicationContext;
    
    @SpringBootApplication
    public class SpringbootProviderApplication {
    
        public static void main(String[] args) {
    
    //        ConfigurableApplicationContext content = SpringApplication.run(SpringbootProviderApplication.class, args);
            SpringApplication app =  new SpringApplication(SpringbootProviderApplication.class);
            app.setAdditionalProfiles("test");
            ConfigurableApplicationContext content = app.run(args);
            System.out.println("springname=" + content.getEnvironment().getProperty("springboot.name"));
            System.out.println("ds.name="  + content.getEnvironment().getProperty("ds.name"));
            System.out.println("ds.password="  + content.getEnvironment().getProperty("ds.password"));
            System.out.println("jdbc.url="  + content.getEnvironment().getProperty("jdbc.url"));
        }
    
    }

输出结果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA_size_16_color_FFFFFF_t_70 5][]

**编程的方式激活多个配置文件app.setAdditionalProfiles("test","dev");**

还有一种特殊用法，是当某个profile激活时把某个bean交给spring托管。

新建一个配置类，利用@Profile注解，当dev激活时，把creatRable2交给spring托管，当test激活时把creatRable3交给spring托管

package com.lsl;
    
    import org.springframework.boot.SpringBootConfiguration;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Profile;
    
    @SpringBootConfiguration
    public class MyConfig {
    
        @Bean
        public Runnable createRable1(){
            System.out.println("=======default======");
            return ()->{};
        }
    
        @Bean
        @Profile("dev")
        public Runnable createRable2(){
            System.out.println("=======dev======");
            return ()->{};
        }
    
        @Bean
        @Profile("test")
        public Runnable createRable3(){
            System.out.println("=======test======");
            return ()->{};
        }
    }

结果输出：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA_size_16_color_FFFFFF_t_70 6][]

对了，默认的配置文件是默认激活状态的。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA_size_16_color_FFFFFF_t_70]: /images/20221022/cda41153e04e4ad39ce0ff9498b4fce6.png
[https_blog.csdn.net_dhklsl_article_details_114985492]: https://blog.csdn.net/dhklsl/article/details/114985492
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20210319182743704.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20210322144004281.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20210322144134776.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20210322144302323.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20210322144722971.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA_size_16_color_FFFFFF_t_70 6]: https://img-blog.csdnimg.cn/20210322151059873.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Roa2xzbA==,size_16,color_FFFFFF,t_70