Determine whether a file is a ZIP File. : Zip Tar File « File Input Output « Java

1. Java
2. File Input Output
3. Zip Tar File

Determine whether a file is a ZIP File.

       

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.zip.ZipFile;

public class Main {


  /**
   * Determine whether a file is a ZIP File.
   */
  public static boolean isZipFile(File file) throws IOException {
      if(file.isDirectory()) {
          return false;
      }
      if(!file.canRead()) {
          throw new IOException("Cannot read file "+file.getAbsolutePath());
      }
      if(file.length() < 4) {
          return false;
      }
      DataInputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream(file)));
      int test = in.readInt();
      in.close();
      return test == 0x504b0304;
  }
}

   
    
    
    
    
    
    
  

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