場(chǎng)景：Spring Boot 打 jar 包時(shí)，文件命名增加編譯時(shí)間；以及在 application.yml 配置文件中拿到編譯時(shí)間；

• Apache Maven 3.8.2
• Spring Boot 2.4.1

一、maven.build.timestamp

1、pom.xml

<properties>
    <buildTime>${maven.build.timestamp}</buildTime>
    <maven.build.timestamp.format>yyyy-MM-dd HH:mm:ss</maven.build.timestamp.format>
</properties>

2、application.yml

app:
  version: @project.version@
  buildTime: @buildTime@

??要在 application.yml 配置中獲取到 pom.xml 中的屬性，需要添加如下配置

<build>
    <!-- jar 包命名格式 -->
    <finalName>${project.artifactId}-${version}-${buildTime}</finalName>
        
    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <filtering>true</filtering>
        </resource>
    </resources>
</build>

??不過(guò)這種方式獲取到的時(shí)間有時(shí)區(qū)問(wèn)題，拿到的是 UTC 時(shí)間，無(wú)法指定時(shí)區(qū)，因此比中國(guó)晚 8 小時(shí)；為解決時(shí)區(qū)問(wèn)題，可使用插件 buildnumber-maven-plugin 或 build-helper-maven-plugin 獲取編譯時(shí)間

二、buildnumber-maven-plugin

1、pom.xml

<build>
    <finalName>${project.artifactId}-${version}-${timestamp}</finalName>
    
    <plugins>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>buildnumber-maven-plugin</artifactId>
            <version>3.0.0</version>
            <configuration>
                <timestampFormat>yyyy-MM-dd HH:mm:ss</timestampFormat>
            </configuration>
            <executions>
                <execution>
                    <goals>
                        <goal>create-timestamp</goal>
                    </goals>
                </execution>
            </executions>
            <inherited>false</inherited>
        </plugin>
    </plugins>
        
        
    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <filtering>true</filtering>
        </resource>
    </resources>
</build>

2、application.yml

app:
  version: @project.version@
  buildTime: @timestamp@

三、build-helper-maven-plugin

1、pom.xml

<build>
    <finalName>${project.artifactId}-${version}-${buildTime}</finalName>
    
    <plugins>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>build-helper-maven-plugin</artifactId>
            <version>3.2.0</version>
            <executions>
                <execution>
                    <id>timestamp-property</id>
                    <goals>
                        <goal>timestamp-property</goal>
                    </goals>
                    <configuration>
                        <name>buildTime</name>
                        <pattern>yyyyMMddHHmmss</pattern>
                        <locale>zh_CN</locale>
                        <timeZone>GMT+8</timeZone>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
        
        
    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <filtering>true</filtering>
        </resource>
    </resources>
</build>

2、application.yml

app:
  version: @project.version@
  buildTime: @buildTime@

????注意：finalName 標(biāo)簽配置的 jar 包名稱格式中，如果存在冒號(hào):時(shí)，雖然可以在 IDEA 中點(diǎn)擊 Run 按鈕啟動(dòng)，但是部署時(shí)使用 java -jar ***.jar 無(wú)法啟動(dòng)并報(bào)錯(cuò)：

找不到或無(wú)法加載主類 org.springframework.boot.loader.JarLauncher

??上面三種方式通過(guò) maven 打包之后在運(yùn)行，都可以在 yml 配置中獲取到編譯的時(shí)間值；但是如果沒(méi)打包，直接點(diǎn)擊 Run 按鈕啟動(dòng) Spring Boot 程序;maven.build.timestamp 可以正常獲取到時(shí)間，buildnumber-maven-plugin 的 timestamp 為空；而 build-helper-maven-plugin 直接報(bào)錯(cuò)：

17:55:22.077 [main] ERROR org.springframework.boot.SpringApplication - Application run failed
org.yaml.snakeyaml.scanner.ScannerException: while scanning for the next token
found character '@' that cannot start any token. (Do not use @ for indentation)
 in 'reader', line 23, column 14:
      buildTime: @buildTime@
                 ^