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How to unzip a file from a byte array in Java
In this article, we will learn how to unzip a file from a byte array in Java. A byte array is an array of bytes that can store any kind of data, such as images, text, or binary files. Sometimes, we may need to unzip a file from a byte array that we receive from a database, a network, or an email attachment.
Java How To Unzip File From Byte Array
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One way to unzip a file from a byte array is to use the java.util.zip.ZipInputStream class. This class allows us to read compressed data from an input stream and decompress it on the fly. We can use a java.io.ByteArrayInputStream to wrap the byte array and pass it to the ZipInputStream constructor. Then, we can iterate over the entries in the zip file using the getNextEntry() method and read the data from each entry using the read() method. We can write the data to an output stream, such as a java.io.FileOutputStream, to save the unzipped file to disk.
Here is an example of how to unzip a file from a byte array using ZipInputStream:
// The byte array that contains the zipped file
byte[] zippedFile = ...;
// The output directory where we want to save the unzipped files
String outputDir = "output/";
try
// Create a ByteArrayInputStream from the byte array
ByteArrayInputStream bais = new ByteArrayInputStream(zippedFile);
// Create a ZipInputStream from the ByteArrayInputStream
ZipInputStream zis = new ZipInputStream(bais);
// Get the first entry in the zip file
ZipEntry entry = zis.getNextEntry();
// Loop until there are no more entries
while (entry != null)
// Get the name of the entry
String fileName = entry.getName();
// Create a FileOutputStream for the output file
FileOutputStream fos = new FileOutputStream(outputDir + fileName);
// Create a buffer to read the data
byte[] buffer = new byte[1024];
int len;
// Read the data from the ZipInputStream and write it to the FileOutputStream
while ((len = zis.read(buffer)) > 0)
fos.write(buffer, 0, len);

// Close the FileOutputStream
fos.close();
// Close the current entry and get the next one
zis.closeEntry();
entry = zis.getNextEntry();

// Close the ZipInputStream and the ByteArrayInputStream
zis.close();
bais.close();
catch (IOException e)
e.printStackTrace();
This code is based on this answer on Stack Overflow[^2^].
Another way to unzip a file from a byte array is to use a third-party library, such as zt-zip. This library provides a simple and convenient API for working with zip files in Java. We can use the ZipUtil.unpack() method to unzip a file from a byte array to a directory. Here is an example of how to use zt-zip:
// The byte array that contains the zipped file
byte[] zippedFile = ...;
// The output directory where we want to save the unzipped files
File outputDir = new File("output/");
// Unzip the file from the byte array to the directory using zt-zip ZipUtil.unpack(zippedFile, outputDir);
This code is based on the documentation of zt-zip.
In conclusion, we have learned two ways to unzip a file from a byte array in Java: using ZipInputStream or using zt-zip. Both methods are easy and effective, but zt-zip may offer more features and flexibility than ZipInputStream. We
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