Apache Tika - Extracting .class file

Example - Extracting Content and Metadata from a class file

Given below is the program to extract content and metadata from a class file.

TikaDemo.java

package com.tutorialspoint.tika;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.asm.ClassParser;
import org.apache.tika.sax.BodyContentHandler;

import org.xml.sax.SAXException;

public class TikaDemo {

   public static void main(final String[] args) throws IOException,SAXException, TikaException {

      //detecting the file type
      BodyContentHandler handler = new BodyContentHandler();
      Metadata metadata = new Metadata();
      FileInputStream inputstream = new FileInputStream(new File("D:/projects/Example.class"));
      ParseContext pcontext = new ParseContext();

      //Class parser
      ClassParser  ClassParser = new  ClassParser();
      ClassParser.parse(inputstream, handler, metadata,pcontext);
      System.out.println("Contents of the document:" + handler.toString());
      System.out.println("Metadata of the document:");
      String[] metadataNames = metadata.names();
      
      for(String name : metadataNames) {		        
         System.out.println(name + " :  " + metadata.get(name));  
      }
   }
}

Output

Given below is the snapshot of Example.java which will generate Example.class after compilation.

package com.tutorialspoint.tika.examples;

public class Example {
   public static void main(String[] args) {
      System.out.println("This is a sample message");
   }
}

Example.class file has the following properties −

After executing the above program you will get the following output.

Contents of the document:
package com.tutorialspoint.tika.examples;
public synchronized class Example {
    public void Example();
    public static void main(String[]);
}

Metadata of the document:
dc:title :  Example
resourceName :  Example.class