How can I convert byte array to zip file

If you have a zip file on disk, get the size using java.io.File.length(), allocate a byte array "buffer" of that size, open the file with FileInputStream, call read(buffer), close the FileInputStream.

If you have a byte array, open the file with a FileOutputStream, call write(byteArray), close the FileOutputStream.

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byte[] originalContentBytes= new Verification().readBytesFromAFile(new File("E://file.zip")); private byte[] readBytesFromAFile(File file){ int start = 0; int length = 1024; int offset = -1; byte[] buffer = new byte[length]; try{ //convert the file content into a byte array FileInputStream fileInuptStream = new FileInputStream(file); BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInuptStream); ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); while ((offset = bufferedInputStream.read(buffer, start, length)) != -1) { byteArrayOutputStream.write(buffer, start, offset); } bufferedInputStream.close(); byteArrayOutputStream.flush(); buffer = byteArrayOutputStream.toByteArray(); byteArrayOutputStream.close(); }catch(FileNotFoundException fileNotFoundException){ fileNotFoundException.printStackTrace(); }catch(IOException ioException){ ioException.printStackTrace(); } return buffer; }