认识可执行JAR

其中包含

  • jar 描述， META-INF/MANIFEST.MF

    • 构造信息
    • 启动类
      1. Manifest-Version: 1.0
      2. Implementation-Title: file
      3. Implementation-Version: 0.0.1-SNAPSHOT
      4. Start-Class: com.detabes.file.FileApplication
      5. Spring-Boot-Classes: BOOT-INF/classes/
      6. Spring-Boot-Lib: BOOT-INF/lib/
      7. Build-Jdk-Spec: 1.8
      8. Spring-Boot-Version: 2.2.5.RELEASE
      9. Created-By: Maven Archiver 3.4.0
      10. Implementation-Vendor: detabes
      11. Main-Class: org.springframework.boot.loader.JarLauncher

  • Spring boot Loader，org/springframework/boot/loader

    • 加载可执行jar，并执行
  • 项目内容，BOOT-INF/classes
  • 项目依赖，BOOT-INF/lib
  • image.png
  • 数据太多有删减 ```shell +—-BOOT-INF | +—-classes | | | application-dev.yml | | |
    | | -—com | | -—detabes | | -—file | | | FileApplication.class
    | |
    | -—lib | annotations-3.0.1.jar |
    +—-META-INF | | MANIFEST.MF | | spring-configuration-metadata.json | |
    | -—maven | -—com.detabes | -—file | pom.properties | pom.xml |
    -—org -—springframework
    1.   \---boot
    2.       \---loader
    3.           |   ExecutableArchiveLauncher.class
    4.           |   
    5.           +---archive
    6.           |       Archive$Entry.class
    7.           +---data
    8.           |       RandomAccessData.class
    9.           |       
    10.           +---jar
    11.           |       AsciiBytes.class
    12.           |       Bytes.class
    13.           |       CentralDirectoryEndRecord$1.class
    14.           |       
    15.           \---util
    16.                   SystemPropertyUtils.class
  1. <a name="LHKRE"></a>
  2. ## 其中不包含
  4. - JDK
  5. - JRE
  7. <a name="TPwIO"></a>
  8. # 如何找到程序的入口
  10. - JarLauncher -> @SpringBootApplication -> FileApplication
  11. <a name="gPDCw"></a>
  12. ## jar的启动类
  14. - MANIFEST.MF
  15.    - Main-Class: org.springframework.boot.loader.JarLauncher
  16. <a name="X7v5X"></a>
  17. ## 项目的主类
  19. - @SpringBootApplication
  20. - MANIFEST.MF
  21.    - Start-Class: com.detabes.file.FileApplication
  23. <a name="W6MSI"></a>
  24. # spring可直接运行的jar
  26. -  <executable>true</executable>
  27. - 谨慎使用
  28.    - 可能一些命令无法使用
  29.       - jar -xf 等
  30. ```xml
  31. <build>
  32.         <plugins>
  33.             <plugin>
  34.                 <groupId>org.springframework.boot</groupId>
  35.                 <artifactId>spring-boot-maven-plugin</artifactId>
  36.                 <configuration>
  37.                     <executable>true</executable>
  38.                 </configuration>
  39.             </plugin>
  40.         </plugins>
  41.     </build>
  • 启动添加自定义参数
    • test.config
      • test.jar test.config 同名同目录
        1. JAVA_OPTS="-Xmx1024m -Xms1024m -Xmn384m"