last modified July 6, 2020

Java ZipInputStream tutorial shows how to read ZIP filesin Java with ZipInputStream.

The url provided by swamy is help ful. If any body wants to try another option their on api java.util.zip API in java in that we can do upload and down load of zip files. Create one java file which uses zip api and include it in ur JSP file. Then u can upload or download the file normally. Cheers, Pradeep.J. Nov 07, 2019 The most basic API we can use to download a file is Java IO. We can use the URL class to open a connection to the file we want to download. To effectively read the file, we'll use the openStream method to obtain an InputStream: BufferedInputStream in = new BufferedInputStream(new URL(FILEURL).openStream). Step – 3 – Extract the downloaded file. Extract the download.zip file which will have the name something like, to any folder such as c:/java. You can use 7zip or Windows default unzip program. To use the windows default unzip program, right click on the zip file and select Extract All. Step – 4 – Execute java command from command line. Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files 1.4.2 This software is licensed under the Oracle Binary Code License Agreement for Java SE Product / File Description.

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Java ZipInputStream

ZipInputStream is a Java class that implements an input stream filter for reading files in the ZIP file format. It has support for both compressed and uncompressed entries.

ZIP

ZIP is an archive file format that supports lossless data compression. A ZIP file may contain one or more files or directories that may have been compressed.Java Archive (JAR) is built on the ZIP format.

ZipInputStream constructors

ZipInputStream has the following constructors:

ZipInputStream getNextEntry

The ZipInputStream'sgetNextEntry() reads the next ZIP file entry and positions the stream at the beginning of the entry data.

Java read ZIP example

The following example reads the contents of a ZIP file.

The example reads the given ZIP file with ZipInputStream and prints its contents to the terminal. We print the file names, their size, and the last modification time.

The ZIP file is located int src/resources/ directory.

We create a FileInputStream from the file. FileInputStream is used for reading streams of raw bytes.

For better performance, we pass the FileInputStream into the BufferedInputStream.

A ZipInputStream is created from the buffered FileInputStream.The try-with-resources closes the streams when they are not needed anymore.

In a while loop, we go through the entries of the ZIP file with getNextEntry()method. It returns null if there are no more entries.

The getName() returns the name of the entry, the getSize() returns the uncompressed size of the entry, and the getTime() returns the last modification time of the entry.

This is a sample output.

Java decompress ZIP example

In the next example, we decompress a ZIP file in Java.

The example uses ZipInputStream to read the contents of the givenZIP file and FileOutputStream and BufferedOutputStreamto write the contents into a directory.

Java Jdk Zip

This is the directory where we extract the contents of the ZIP file.

Java Download Zip File Http

In the first while loop, we go through the entries of the ZIP file.

In the second while loop, we read the entries and write them to the output stream.

In this tutorial, we have presented the Java ZipInputStream class. We havecreated two examples to read a ZIP file and to decompress a ZIP file.

Java Zip File Example

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