Java Temp File Create createTempFile(@Nonnull String prefix, @Nonnull String suffix, @Nullable File parentDir)

Description

Creates a temporary file

License

Open Source License

Parameter

Parameter	Description
prefix	the prefix
suffix	the suffix
parentDir	the parent dir

Return

the created file

Declaration

@Nonnull
public static File createTempFile(@Nonnull String prefix, @Nonnull String suffix, @Nullable File parentDir) 

Method Source Code

//package com.java2s;
/**/*from   w w  w.  ja  va 2  s  . co m*/
 * Copyright (C) cedarsoft GmbH.
 *
 * Licensed under the GNU General Public License version 3 (the "License")
 * with Classpath Exception; you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 *         http://www.cedarsoft.org/gpl3ce
 *         (GPL 3 with Classpath Exception)
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 3 only, as
 * published by the Free Software Foundation. cedarsoft GmbH designates this
 * particular file as subject to the "Classpath" exception as provided
 * by cedarsoft GmbH in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 3 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 3 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact cedarsoft GmbH, 72810 Gomaringen, Germany,
 * or visit www.cedarsoft.com if you need additional information or
 * have any questions.
 */

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.io.File;

import java.text.DecimalFormat;

import java.util.Random;

public class Main {
    /**
     * Creates a temporary file
     *
     * @param prefix    the prefix
     * @param suffix    the suffix
     * @param parentDir the parent dir
     * @return the created file
     */
    @Nonnull
    public static File createTempFile(@Nonnull String prefix, @Nonnull String suffix, @Nullable File parentDir) {
        Random rand = new Random();

        String parent = parentDir == null ? System.getProperty("java.io.tmpdir") : parentDir.getPath();
        DecimalFormat fmt = new DecimalFormat("#####");

        File result;
        do {
            result = new File(parent, prefix + fmt.format(Math.abs(rand.nextInt())) + suffix);
        } while (result.exists());
        return result;
    }
}

Related

1. createTempFile(final String file, final String ext)
2. createTempFile(String oriFileName)
3. getTempFile()
4. getTempFile()