提取目标jar文件中的内容到指定目录

jdk为11

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

/**
 * @author JHL
 */
public class ExtractJarUtil {

    public static final String USER_HOME = System.getProperty("user.home") + File.separator;

    public static final String SYSTEM_TMP_DIR = System.getProperty("java.io.tmpdir");

    public static void extractJar(String jarPath, String destDir) throws IOException {

        File dest = new File(destDir);
        if (!dest.exists()) {
            dest.mkdirs();
        }

        JarFile jar = new JarFile(jarPath);
        Enumeration<JarEntry> entries = jar.entries();
        while (entries.hasMoreElements()) {
            JarEntry entry = entries.nextElement();
            if (entry.isDirectory()) {
                continue;
            }
            InputStream in = jar.getInputStream(entry);
            Path outPath = Paths.get(destDir, entry.getName());
            Files.createDirectories(outPath.getParent());
            try (FileOutputStream out = new FileOutputStream(outPath.toFile())) {
                byte[] buffer = new byte[1024];
                int bytesRead;
                while ((bytesRead = in.read(buffer)) != -1) {
                    out.write(buffer, 0, bytesRead);
                }
            }
        }
    }

    public static void main(String[] args) throws IOException {
        // extractJar("example.jar", System.getProperty("java.io.tmpdir"));
        // extractJar("D:\\code\\gitee\\hikvision\\camera\\target\\camera-1.0-SNAPSHOT.jar", System.getProperty("user.home"));
    }
}