java打包文件成zip、压缩文件及file.mkdir和mkdirs的区别详解

File dir = new File("C:\\parentDir\\subDir\\newDir");
boolean created = dir.mkdir(); // 如果 parentDir 或 subDir 不存在，则创建失败
boolean created = dir.mkdirs(); // 会创建 parentDir 和 subDir，如果它们不存在

创建一个 ZipOutputStream 对象 ---- 使用 ZipEntry 将文件添加到 zip 包中 ---- 将文件内容写入到 ZipOutputStream 中 ---- 关闭 ZipOutputStream 对象

public class Test {
    public static void main(String[] args) {
        //文件所在的位置
        String filePath = "C:\\Users\\ASUS\\Desktop\\12.txt";
        //压缩后文件存放的位置
        String zipFilePath = "C:\\Users\\ASUS\\Desktop\\12.zip";

        //使用try-with-resources语句来确保流在使用后正确关闭
        try (
                FileInputStream fileInputStream = new FileInputStream(filePath);
                //创建ZipOutputStream对象
                FileOutputStream fileOutputStream = new FileOutputStream(zipFilePath);
                ZipOutputStream zipOutputStream = new ZipOutputStream(fileOutputStream)
        ) {

            //使用ZipEntry将文件添加到zip包中：表示要添加到zip包中的文件名为"12.txt"
            ZipEntry zipEntry = new ZipEntry("12.txt");
            zipOutputStream.putNextEntry(zipEntry);

            //将文件内容写入到ZipOutputStream中
            byte[] buffer = new byte[1024];
            int len;
            while ((len = fileInputStream.read(buffer)) != -1) {
                zipOutputStream.write(buffer, 0, len);
            }
            zipOutputStream.closeEntry();
            
        } catch (Exception e) {
            e.printStackTrace();
        }
	}
}

public class Test {
    public static void main(String[] args) {
        
        //文件位置
        String filePath = "C:\\Users\\ASUS\\Desktop\\11";
        //输出位置
        String zipFilePath = "C:\\Users\\ASUS\\Desktop\\11.zip";

        try (
                FileOutputStream fos = new FileOutputStream(zipFilePath);
                ZipOutputStream zos = new ZipOutputStream(fos)
        ) {
            //创建文件对象
            File file = new File(filePath);
            //调方法：开始递归添加文件和文件夹
            zipFile(file, file.getName(), zos);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void zipFile(File file, String fileName, ZipOutputStream zos) {
        if (file.isDirectory()) {
            File[] children = file.listFiles();
            for (File child : children) {
                zipFile(child, child.getName(), zos);
            }
        }
        try (
                FileInputStream fileInputStream = new FileInputStream(file)
        ) {
            ZipEntry zipEntry = new ZipEntry(fileName);
            zos.putNextEntry(zipEntry);

            byte[] buffer = new byte[1024];
            int len;
            while ((len = fileInputStream.read(buffer)) != -1) {
                zos.write(buffer, 0, len);
            }
            zos.closeEntry();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
}

public class Test {
    public static void main(String[] args) {
        
        //文件位置
        String filePath = "C:\\Users\\ASUS\\Desktop\\11";
        //输出位置
        String zipFilePath = "C:\\Users\\ASUS\\Desktop\\11.zip";

        try (
                FileOutputStream fos = new FileOutputStream(zipFilePath);
                ZipOutputStream zos = new ZipOutputStream(fos)
        ) {
            //创建文件对象
            File file = new File(filePath);
            //调方法：开始递归添加文件和文件夹
            //file.getName：获取文件名，包括文件名后缀
            zipFile(file, file.getName(), zos);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    public static void zipFile(File file, String fileName, ZipOutputStream zos) {
        if (file.isDirectory()) {
            /*
            假如是个空文件夹，下面这个：
             zos.putNextEntry(new ZipEntry(fileName + "/"));
            就是为了保留空文件夹
             */
            try {
                zos.putNextEntry(new ZipEntry(fileName + "/"));
                zos.closeEntry();
            } catch (Exception e) {
                e.printStackTrace();
            }

            File[] children = file.listFiles();
            //确保目录不是空的
            if (children != null) {
                for (File child : children) {
                    //加 fileName + "/" 是为了保留原始的目录结构
                    zipFile(child, fileName + "/" + child.getName(), zos);
                }
            }
            return;
        }

        try (
                FileInputStream fileInputStream = new FileInputStream(file)
        ) {
            ZipEntry zipEntry = new ZipEntry(fileName);
            zos.putNextEntry(zipEntry);

            byte[] buffer = new byte[1024];
            int len;
            while ((len = fileInputStream.read(buffer)) != -1) {
                zos.write(buffer, 0, len);
            }
            zos.closeEntry();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
       
}