如何将文本文件从罐子复制到罐子外部的文件中？

假设jar在您的类路径中：

URL url = getClassLoader().getResource("com/test/io/test.txt");FileOutputStream output = new FileOutputStream("test.txt");InputStream input = url.openStream();byte [] buffer = new byte[4096];int bytesRead = input.read(buffer);while (bytesRead != -1) {    output.write(buffer, 0, bytesRead);    bytesRead = input.read(buffer);}output.close();input.close();