提取 JAR 文件（Extracting JAR File）

以下是从Java Archive（jar）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.sax.BodyContentHandler;
import org.apache.tika.parser.pkg.PackageParser;
import org.xml.sax.SAXException;
public class PackageParse {
   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.jar"));
      ParseContext pcontext = new ParseContext();
      //Package parser
      PackageParser packageparser = new PackageParser();
      packageparser.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PackageParse.java ，并使用以下命令从命令提示符编译它 -

javac PackageParse.java
java PackageParse 

下面给出了包含在包内的Example.java的快照。

jar文件具有以下属性 -

执行上述程序后，它会给你以下输出 -

Output -

<b>Contents of the document:</b>
META-INF/MANIFEST.MF
xnip/tika/examples/Example.class
<b>Metadata of the document:</b>
Content-Type:   application/zip