spring boot: 一般注入说明(四) Profile配置,Environment环境配置 @Profile注解
1.通过设定Environment的ActiveProfile来设置当前context所需要的环境配置,在开发中使用@Profile注解类或方法,达到不同情况下选择实例化不同的Bean.
2.使用jvm的spring.profiles.acitve的参数来配置环境
3.web项目设置在Servlet的context pramater
servlet2.5一下的配置
<servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>spring-profiles.active<param-name> <param-value>production</param-value> </init-param> </servlet>
servlet3.0以上的配置
public class WebInit implements WebApplicationInitializer{ @Override public void onStartup(ServletContext container) throws ServletException{ container.setInitParameter("spring.profiles.default", "dev"); } }
我没有配置
实例:
DemoBean文件:
package ch2.profile; public class DemoBean { private String content; public DemoBean(String content) { this.content = content; } public String getContent() { return content; } public void setContent(String content) { this.content = content; } }
profileConfig文件
package ch2.profile; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Profile; import org.springframework.context.annotation.Configuration; //声明本类是一个配置类 @Configuration public class ProfileConfig { //这个一个Bean对象 @Bean //profile为dev时实例化devDemoBean @Profile("dev") public DemoBean devDemoBean() { return new DemoBean("from development profile "); } //这是一个Bean对象 @Bean //profile为pro时实例化prDemoBean @Profile("prod") public DemoBean proDemoBean() { return new DemoBean("from production profile"); } }
Main文件:
package ch2.profile; import org.springframework.context.annotation.AnnotationConfigApplicationContext; public class Main { public static void main(String args[]) { AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(); //先将活动的profile注册为prod context.getEnvironment().setActiveProfiles("prod"); //后注册Bean配置类,不然会报Bean未定义的错误 context.register(ProfileConfig.class); //刷新容器 context.refresh(); //注册Bean DemoBean demoBean = context.getBean(DemoBean.class); //打印 System.out.println(demoBean.getContent()); context.close(); } }
运行结果:
from production profile