java原生和SpringBoot读取jar包中MANIFESTMF的方式

Java原生方式读取jar包中MANIFEST.MF的方式如下：

import java.io.IOException;
import java.util.jar.Attributes;
import java.util.jar.JarFile;
import java.util.jar.Manifest;

public class Main {
    public static void main(String[] args) {
        try {
            JarFile jarFile = new JarFile("path/to/your/jar/file.jar");
            Manifest manifest = jarFile.getManifest();
            Attributes attributes = manifest.getMainAttributes();
            String version = attributes.getValue("Implementation-Version");
            String createdBy = attributes.getValue("Created-By");
            System.out.println("Version: " + version);
            System.out.println("Created by: " + createdBy);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Spring Boot的方式可以使用org.springframework.boot.loader.JarFile类来读取MANIFEST.MF的内容。需要添加Spring Boot的依赖：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-loader</artifactId>
    <version>2.5.2</version>
</dependency>

然后使用以下代码读取MANIFEST.MF的内容：

import org.springframework.boot.loader.JarFile;

import java.io.IOException;
import java.util.jar.Attributes;
import java.util.jar.Manifest;

public class Main {
    public static void main(String[] args) {
        try {
            JarFile jarFile = new JarFile("path/to/your/jar/file.jar");
            Manifest manifest = jarFile.getManifest();
            Attributes attributes = manifest.getMainAttributes();
            String version = attributes.getValue("Implementation-Version");
            String createdBy = attributes.getValue("Created-By");
            System.out.println("Version: " + version);
            System.out.println("Created by: " + createdBy);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

需要注意的是，Spring Boot的方式依赖于Spring Boot的特性，适用于使用Spring Boot打包的jar文件