Javazip-zipentry-setcomment

java.util.zip.ZipEntry.setComment（）メソッドの例

説明

• java.util.zip.ZipEntry.setComment（String comment）*メソッドは、エントリのオプションのコメント文字列を設定します。

宣言

以下は、* java.util.zip.ZipEntry.setComment（String comment）*メソッドの宣言です。

public void setComment(String comment)

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パラメーター

• comment -コメント文字列。

前提条件

*D：> test>* ディレクトリに次の内容のファイルHello.txtを作成します。

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This is an example.

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例

次の例は、java.util.zip.ZipEntry.setComment（String comment）メソッドの使用方法を示しています。

package com.finddevguides;

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 ZipEntryDemo {
   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.println("Iterating over zip file : " + TARGET_FILE);
      try {
         final Enumeration<? extends ZipEntry> entries = file.entries();
         while (entries.hasMoreElements()) {
            final ZipEntry entry = entries.nextElement();
            System.out.printf("File: %s Size %d Modified on %TD %n",
               entry.getName(), entry.getSize(),
                  new Date(entry.getTime()));
            System.out.println(entry.getComment());
            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();
      }
   }
}

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上記のプログラムをコンパイルして実行すると、次の結果が生成されます-

Iterating over zip file : D:\test\Hello.zip
File: D:\test\Hello.txt Size 19 Modified on 05/20/17
This is a sample file.
Zip file D:\test\Hello.txt extracted successfully.

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