08点睛Spring4.1-Profile

8.1 Profile

• Profile让在不同环境下使用不同的配置提供了支持(如开发环境下的配置和生产环境下的配置肯定是不同的,如：数据库的配置);
  • 通过设定Environment的ActiveProfiles来设定当前context需要使用的配置环境
  • 通过设定jvm的spring.profiles.active参数来设置配置环境(web项目中设置在servlet的context parameter中)

8.2 示例

8.2.1 新建测试bean

package com.wisely.profile;

public class DemoBean {
    private String url;

    public DemoBean(String url) {
        super();
        this.url = url;
        System.out.println("地址为："+url);
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

}

8.2.2 编写配置文件

package com.wisely.profile;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;

@Configuration
public class DemoConfig {

    @Bean
    @Profile("dev")
    public DemoBean devDemoBean(){
        return new DemoBean("http://www.baidu.com");
    }

    @Bean
    @Profile("prod")
    public DemoBean prodDemoBean(){
        return new DemoBean("http://www.qq.com");
    }

}

8.2.3 测试

8.2.3.1 使用Environment选择配置

package com.wisely.profile;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Main {

    public static void main(String[] args) {
        AnnotationConfigApplicationContext context =
                new AnnotationConfigApplicationContext();
        context.getEnvironment().setActiveProfiles("dev");
        context.scan("com.wisely.profile");
        context.refresh();
        context.close();

    }

}

输出结果

地址为：http://www.baidu.com

8.2.3.2 使用JVM参数选择配置

package com.wisely.profile;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Main {

    public static void main(String[] args) {
        AnnotationConfigApplicationContext context =  new AnnotationConfigApplicationContext();
        context.scan("com.wisely.profile");
        context.refresh();
        context.close();

    }

}

  输出结果:

地址为：http://www.qq.com

8.2.3.2 在web项目中的配置

• web.xml(servlet 2.5及以下)

<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>

• java config(servlet 3.0及以上)

public class WebInit implements WebApplicationInitializer {

    @Override
    public void onStartup(ServletContext container) throws ServletException {
        container.setInitParameter("spring.profiles.default", "dev");

    }

}