# SpringBoot常用配置-Profile
## SpringBoot常用配置-Profile
## 分析
对于Profile先做一个简单的介绍:\
单讲profile就是一组配置，不同profile提供不同组合的配置，程序运行时可以选择使用哪些profile来适应环境。
也就是Profile为在不同环境下使用不同的配置提供了支持(开发环境下的配置和生产环境下的配置肯定是不同的，例如:数据库的配置)
Spring 为我们提供了大量的激活 profile 的方法，可以通过代码来激活，也可以通过系统环境变量、JVM参数、servlet上下文参数来定义 spring.profiles.active 参数激活 profile,下面说下3种方法:\
1、通过设定Environment的ActiveProfiles来设定当前context需要使用的配置环境。在开发中使用@profile注解类或者方法，达到在不同情况下选择实例化不同的Bean。\
2、通过设定jvm的spring.profile.active参数来设置配置环境。\
3、Web项目设置在Service的context parameter中。
## 示例
### 示例Bean
```
package cn.hncu.p2_4_2Profile;
/**
* Created with IntelliJ IDEA.
* User: 陈浩翔.
* Date: 2016/11/14.
* Time: 下午 8:37.
* Explain:示例Bean
*/
public class DemoBean {
public String content;
public DemoBean(String content) {
super();
this.content = content;
}
public String getContent(){
return content;
}
public void setContent(String content) {
this.content = content;
}
}
```
### Profile配置
```
package cn.hncu.p2_4_2Profile;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;
/**
* Created with IntelliJ IDEA.
* User: 陈浩翔.
* Date: 2016/11/14.
* Time: 下午 8:41.
* Explain:Profile配置
*/
@Configuration
public class ProfileConfig {
@Bean
@Profile("dev")//Profile为dev时实例化devDemoBean
public DemoBean devDemoBean(){
return new DemoBean("from development profile");
}
@Bean
@Profile("prod")//Profile为prod时实例化prodDemoBean
public DemoBean prodDemoBean(){
return new DemoBean("from production profile");
}
}
```
### 运行类
```
package cn.hncu.p2_4_2Profile;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
/**
* Created with IntelliJ IDEA.
* User: 陈浩翔.
* Date: 2016/11/14.
* Time: 下午 8:51.
* Explain:运行类
*/
public class Main {
public static void main(String[] args) {
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
context.getEnvironment().setActiveProfiles("prod");//先将活动的Proofile设置为prod
context.register(ProfileConfig.class);//后置注册Bean的配置类，不然会报Bean未定义的错误
context.refresh();//刷新容器
DemoBean demoBean = context.getBean(DemoBean.class);
System.out.println(demoBean.getContent());
context.close();
}
}
```
### 运行结果
现在来对Main类做一下改动，将\
context.getEnvironment().setActiveProfiles(“prod”)\
修改为\
context.getEnvironment().setActiveProfiles(“dev”)
结果如下:
---
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