提取 .class 文件（Extracting .class File）

下面给出了从.class文件中提取内容和元数据的程序。

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 JavaClassParse {
   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("Example.class"));
      ParseContext pcontext = new ParseContext();
      //Html 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));  
      }
   }
}

将上面的代码保存为JavaClassParse.java ，并使用以下命令从命令提示符编译它 -

javac JavaClassParse.java
java JavaClassParse 

下面给出的是Example.java的快照，它将在编译后生成Example.class。

Example.class文件具有以下属性 -

执行上述程序后，您将获得以下输出。

Output -

<b>Contents of the document:</b>
package xnip.tika.examples;
public synchronized class Example {
   public void Example();
   public static void main(String[]);
}
<b>Metadata of the document:</b>
title: Example
resourceName: Example.class
dc:title: Example