spring boot实现profiles动态切换的示例

具体做法：

1、首先在pom中添加profiles:

<profiles> <profile> <id>dev</id> <activation> <activeByDefault>true</activeByDefault> </activation> <properties> <spring.profiles.active>dev</spring.profiles.active> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-undertow</artifactId> </dependency> </dependencies> </profile> <profile> <id>prod</id> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-undertow</artifactId> </dependency> </dependencies> <properties> <spring.profiles.active>prod</spring.profiles.active> </properties> </profile></profiles>

dev指开发模式，prod指生产模式，如需其他模式，只需要添加profile即可.

2、在pom.xml的build中添加plugin:

<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-resources-plugin</artifactId> <version>${maven-resources-plugin.version}</version> <executions> <execution> <id>default-resources</id> <phase>validate</phase> <goals> <goal>copy-resources</goal> </goals> <configuration> <outputDirectory>target/classes</outputDirectory> <useDefaultDelimiters>false</useDefaultDelimiters> <delimiters><delimiter>#</delimiter> </delimiters> <resources><resource> <directory>src/main/resources/</directory> <filtering>true</filtering> <includes> <include>**/*.xml</include> <include>**/*.yml</include> </includes></resource><resource> <directory>src/main/resources/</directory> <filtering>false</filtering> <excludes> <exclude>**/*.xml</exclude> <exclude>**/*.yml</exclude> </excludes></resource> </resources> </configuration> </execution> </executions></plugin>

该配置用来在打包的时候修改配置文件。

3、编写DefaultProfileUtil工具类来添加默认启动配置文件:

import org.springframework.boot.SpringApplication;import org.springframework.core.env.Environment; import java.util.HashMap;import java.util.Map; /** * Utility class to load a Spring profile to be used as default * when there is no <code>spring.profiles.active</code> set in the environment or as command line argument. * If the value is not available in <code>application.yml</code> then <code>dev</code> profile will be used as default. */public final class DefaultProfileUtil { private static final String SPRING_PROFILE_DEFAULT = 'spring.profiles.default'; private DefaultProfileUtil(){ } /** * Set a default to use when no profile is configured. * * @param app the spring application */ public static void addDefaultProfile(SpringApplication app) { Map<String, Object> defProperties = new HashMap<>(); /* * The default profile to use when no other profiles are defined * This cannot be set in the <code>application.yml</code> file. * See https://github.com/spring-projects/spring-boot/issues/1219 */ defProperties.put(SPRING_PROFILE_DEFAULT, Constants.SPRING_PROFILE_DEVELOPMENT); app.setDefaultProperties(defProperties); System.out.println(app); } /** * Get the profiles that are applied else get default profiles. */ public static String[] getActiveProfiles(Environment env) { String[] profiles = env.getActiveProfiles(); if (profiles.length == 0) { return env.getDefaultProfiles(); } return profiles; }}

public class Constants { public static final String SPRING_PROFILE_DEVELOPMENT = 'dev'; public static final String SPRING_PROFILE_PRODUCTION = 'prod'; private Constants() { }}

4、修改application.yml配置文件，添加(采用application.properties文件)：

spring: profiles: active: #spring.profiles.active#

maven的构建的时候会替换#spring.profiles.active#

5、修改项目的启动类：

@SpringBootApplicationpublic class Demo1Application { private static final Logger log = LoggerFactory.getLogger(Demo1Application.class); public static void main(String[] args) { SpringApplication app = new SpringApplication(Demo1Application.class); DefaultProfileUtil.addDefaultProfile(app); Environment env = app.run(args).getEnvironment(); log.info('n----------------------------------------------------------nt' + 'Application ’{}’ is running! Access URLs:nt' + 'Local: tthttp://localhost:{}nt' + '----------------------------------------------------------', env.getProperty('spring.application.name'), env.getProperty('server.port')); }}

以上修改完成之后，在启动的时候会显示：The following profiles are active: dev 默认dev模式切换成功。

6、构建项目：

采用mvn clean package -Pprod命令构建，最后的配置文件会被改成：

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