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ファイルサイズを取得する | Java | 株式会社CONFRAGE
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ファイルサイズを取得する
ファイルサイズを取得するには、java.io.Fileクラスのlength()メソッドを使用します。
戻り値はlong型で、ファイルの種類はアスキーでもバイナリーでも構いません。
以下、例です。

JAVAソース
import java.io.File;
public class Test{
    public static void main(String[] args) {
        File file = new File("C:¥¥test.txt");
        System.out.println(file.length());
    }
}
実行結果は以下のようになります。

24279
上記のように、バイト数が表示されます。

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