Exemple de méthode java.util.zip.ZipFile.size ()

La description

le java.util.zip.ZipFile.size() La méthode renvoie le nombre d'entrées dans le fichier ZIP.

Déclaration

Voici la déclaration pour java.util.zip.ZipFile.size() méthode.

public int size()

Retour

le nombre d'entrées dans le fichier ZIP.

Prérequis

Créez un fichier Hello.txt dans D:> test > répertoire avec le contenu suivant.

This is an example.

Example

The following example shows the usage of java.util.zip.ZipFile.size() method.

package com.tutorialspoint;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.Enumeration;
import java.util.zip.Adler32;
import java.util.zip.CheckedOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

public class ZipFileDemo {
   private static String SOURCE_FILE = "D:\\test\\Hello.txt";
   private static String TARGET_FILE = "D:\\test\\Hello.zip";

   public static void main(String[] args) {
      try {
         createZipFile();
         readZipFile();
      } catch(IOException ioe) {
         System.out.println("IOException : " + ioe);
      }
   }

   private static void createZipFile() throws IOException{
      FileOutputStream fout = new FileOutputStream(TARGET_FILE);
      CheckedOutputStream checksum = new CheckedOutputStream(fout, new Adler32());
      ZipOutputStream zout = new ZipOutputStream(checksum);

      FileInputStream fin = new FileInputStream(SOURCE_FILE);
      ZipEntry zipEntry = new ZipEntry(SOURCE_FILE);
      zipEntry.setComment("This is a sample file.");
      zout.putNextEntry(zipEntry);
      int length;
      byte[] buffer = new byte[1024];
      while((length = fin.read(buffer)) > 0) {
         zout.write(buffer, 0, length);
      }

      zout.closeEntry();
      fin.close();
      zout.close();
   }

   private static void readZipFile() throws IOException{
      final ZipFile file = new ZipFile(TARGET_FILE); 
      System.out.printf("Zip File: %s, Contains %d file(s). %n",file.getName(), file.size()); 
      try { 
         ZipEntry entry = file.getEntry(SOURCE_FILE);
         if(entry != null){
            System.out.printf("File: %s Size %d Modified on %TD %n", 
               entry.getName(), entry.getSize(), 
               new Date(entry.getTime()));
            extractFile(entry, file.getInputStream(entry)); 
         }
         System.out.printf("Zip file %s extracted successfully.", SOURCE_FILE); 
      } 
      finally { 
         file.close(); 
      }
   }

   private static void extractFile(final ZipEntry entry, InputStream is) 
      throws IOException {
      FileOutputStream fos = null; 
      try { 
         fos = new FileOutputStream(entry.getName()); 
         final byte[] buf = new byte[1024]; 
         int read = 0; 
         int length; 
         while ((length = is.read(buf, 0, buf.length)) >= 0) { 
            fos.write(buf, 0, length); 
         } 
      } catch (IOException ioex) { 
         fos.close(); 
      } 
   }
}

Let us compile and run the above program, this will produce the following result −

Zip File: D:\test\Hello.zip, Contains 1 file(s). 
File: D:\test\Hello.txt Size 1024 Modified on 05/22/17 
Zip file D:\test\Hello.txt extracted successfully.

Print