Java Program to Extract Content from a Java's .class File Last Updated : 02 Nov, 2020 Summarize Comments Improve Suggest changes Share Like Article Like Report In this article, we are going to extract the contents of the Java class file using the Apache Tika library. Apache Tika is used for document type detection and content extraction from various file formats. It uses various document parsers and document type detection techniques to detect and extract data. It provides a single generic API for parsing different file formats. All these parser libraries are encapsulated in a single interface called the Parser interface. The following table shows a description of the important methods used in the solution : Method Description BodyContentHandler()It creates a content handler that writes XHTML body character events to an internal string buffer.Metadata() It constructs new, empty metadata.ParseContext()It creates a parse context object that is used to pass context information to Tika parsers.parse()Instantiate the parser object, and invoke the parse method. Example: Java code to extract the contents of Java class file format Java // Java program to extract the // contents of Java class file // format import java.io.File; import java.io.FileInputStream; import java.io.IOException; // importing Apache Tika libraries import org.apache.tika.exception.TikaException; import org.apache.tika.metadata.Metadata; import org.apache.tika.parser.AutoDetectParser; import org.apache.tika.parser.ParseContext; import org.apache.tika.parser.Parser; import org.apache.tika.sax.BodyContentHandler; import org.xml.sax.SAXException; public class ParserExtraction { public static void main(final String[] args) throws IOException, SAXException, TikaException { // create a File object File f = new File("AddTwoNumbers.java"); // parse method parameters Parser parser = new AutoDetectParser(); // instantiate BodyContentHandle BodyContentHandler handler = new BodyContentHandler(); // Creates the Metadata object Metadata metadata = new Metadata(); FileInputStream inputstream = new FileInputStream(f); // creates a parse context object ParseContext context = new ParseContext(); // parsing the file parser.parse(inputstream, handler, metadata, context); // display the file content System.out.println("File content : " + Handler.toString()); } } Input :AddTwoNumbers.java Output: File content : public class AddTwoNumbers { public static void main(String[] args) { int num1 = 5, num2 = 15, sum; sum = num1 + num2; System.out.println("Sum of these numbers: "+sum); } } Comment More infoAdvertise with us Next Article Java Program to Extract Content From a XML Document A abhijitmahajan772 Follow Improve Article Tags : Java Java Programs Practice Tags : Java Similar Reads Java Program to Extract Content from a PDF Java class< file using the Apache Tika< library is used. Â For document type detection and content extraction from various file formats, it uses various document parsers and document type detection techniques to detect and extract data. It provides a single generic API for parsing different fil 3 min read Java Program to Create String from Contents of a File A File is a computer resource which is deployed to store different types of data such as text, image, video, to name a few. It is basically a collection of data bound to a single entity. While using your computer, it becomes essential to be able to deal with files and in this article we will be lear 6 min read Java Program to Extract Content from a HTML document HTML is the core of the web, all the pages you see on the internet are HTML, whether they are dynamically generated by JavaScript, JSP, PHP, ASP, or any other web technology. Your browser actually parses HTML and render it for you But if we need to parse an HTML document and find some elements, tags 4 min read Java Program to Extract Content from a TXT document Java class< file using the Apache Tika library is used. Â For document type detection and content extraction from various file formats, it uses various document parsers and document type detection techniques to detect and extract data. It provides a single generic API for parsing different file fo 3 min read Java Program to Extract Content From a XML Document An XML file contains data between the tags so it is complex to read the data when compared to other file formats like docx and txt. There are two types of parsers which parse an XML file: Object-Based (e.g. D.O.M)Event-Based (e.g. SAX, StAX) In this article, we will discuss how to parse XML using Ja 7 min read How to Read a File From the Classpath in Java? Reading a file from the classpath concept in Java is important for Java Developers to understand. It is important because it plays a crucial role in the context of Resource Loading within applications. In Java, we can read a file from the classpath by using the Input Stream class. By loading the cla 3 min read Like