快捷導(dǎo)航

spring boot實(shí)現(xiàn)profiles動態(tài)切換的示例

更新時間：2020年10月12日 10:56:17 作者：hythzx

Spring Boot支持在不同的環(huán)境下使用不同的配置文件，該技術(shù)非常有利于持續(xù)集成，在構(gòu)建項(xiàng)目的時候只需要使用不同的構(gòu)建命令就可以生成不同運(yùn)行環(huán)境下war包，而不需要手動切換配置文件。

具體做法：

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指開發(fā)模式，prod指生產(chǎn)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>

該配置用來在打包的時候修改配置文件。

3、編寫DefaultProfileUtil工具類來添加默認(rèn)啟動配置文件:

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的構(gòu)建的時候會替換#spring.profiles.active#

5、修改項(xiàng)目的啟動類：

@SpringBootApplication
public 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----------------------------------------------------------\n\t" +
         "Application '{}' is running! Access URLs:\n\t" +
         "Local: \t\thttp://localhost:{}\n\t" +
         "----------------------------------------------------------",
      env.getProperty("spring.application.name"),
      env.getProperty("server.port"));
  }
}

以上修改完成之后，在啟動的時候會顯示：The following profiles are active: dev 默認(rèn)dev模式切換成功。