如何将jar中的文本文件复制到jar外的文件中？

jar tf your-jar-file.jar

jar xf your-jar-file.jar path/to/your/textfile.txt

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.jar.JarFile;

public class ExtractFileFromJar {
    public static void main(String[] args) throws IOException {
        String jarPath = "path/to/your/jarfile.jar";
        String filePath = "path/to/your/textfile.txt";
        String outputPath = "path/to/output/directory/textfile.txt";

        try (JarFile jarFile = new JarFile(jarPath)) {
            InputStream inputStream = jarFile.getInputStream(jarFile.getEntry(filePath));
            byte[] buffer = new byte[1024];
            int bytesRead;

            try (FileOutputStream outputStream = new FileOutputStream(outputPath)) {
                while ((bytesRead = inputStream.read(buffer)) != -1) {
                    outputStream.write(buffer, 0, bytesRead);
                }
            }
        }
    }
}