ZIP Archives are one of the most popular and commonly used compressed file formats. The main reason for using ZIP files is to reduce the total file size and to send multiple files as a single archive. As a developer, you can extract the text, images, and even metadata from the files that are compressed within ZIP archives. In this article, we will discuss how to extract ZIP archives data in Java.

Extract data from ZIP files in Java

The following topics are covered below:

Java API to Extract ZIP files Data

GroupDocs.Parser provides the document parsing solution for developers which also includes the Java API. I will be using this Java API to extract ZIP files data in the example(s) of this article. Additionally, this API allows data extraction of images, raw text, structured and formatted text, and metadata from a long list of supported document formats. These document formats include word-processing documents, PDF, presentations, spreadsheets, emails, databases, eBooks, and many others.

Download or Configure

You may download the JAR file from the downloads section, or just get the latest repository and dependency configurations for the pom.xml of your maven-based Java applications.

<repository>
	<id>GroupDocsJavaAPI</id>
	<name>GroupDocs Java API</name>
	<url>https://repository.groupdocs.com/repo/</url>
</repository>
<dependency>
	<groupId>com.groupdocs</groupId>
	<artifactId>groupdocs-parser</artifactId>
	<version>21.2</version> 
</dependency>

How to Extract ZIP Files Data in Java

To extract the data from any file that is enclosed within the archive, you first need to get all the enclosed files. After that, you can further extract any kind of data from each file. The following steps show how to extract ZIP files data and retrieve text from each enclosed file in Java.

  • Load the ZIP archive using Parser class.
  • Extract the collection of attachments using the getContainer method.
  • Traverse the attachments for the data of each enclosed file.
  • You can get its different kind of data using respective methods of the Parser class.

The source code shows how to extract the ZIP files data using Java. The example below extracts the whole text from all the files within the ZIP archive.

The output of the above source code shows the retrieved text of one of the PDF files within the ZIP file.

 -----------------------------------
 Name: sample.pdf
 File Size: 33370 Bytes
 -----------------------------------

 Heading

 This is the first paragraph of the sample document that contains some sample
 text, bulleted list, numbered list and more.

    •  Bullet Item 1
    •  Bullet Item 2
    •  Bullet Item 3
 
 This is the second paragraph of the sample document and after this, there is a
 numbered list: 

    1. Numbered Item 1
    2. Numbered Item 2
    3. Numbered Item 3

Extract Images from Files within ZIP files in Java

Not limited to just text, you can also similarly extract the images information. The following steps show how to extract ZIP files data and retrieve images information from each enclosed file.

  • Load the ZIP archive using Parser class.
  • Extract the collection of attachments using the getContainer method.
  • Traverse the attachments to get the collection of images within each attachment.
  • Now traverse the images to get the information of each image using  PageImageArea class.

The following source code shows how to extract images data from the files enclosed within the ZIP files in Java.

Image# 1 
Page: 1
File Type: JPEG Image (.jpeg)

Get a Free API License

You can get a free temporary license to use the API without the evaluation limitations.

Conclusion

In short, you have learned how to extract ZIP archives data within your Java applications. Additionally, you can also extract images from the ZIP files using GroupDocs.Parser for Java. Start building your data extraction Java application for compressed files. To learn more about the API, visit the documentation. For queries, contact us via the forum.

See Also