Java File Name Create getRandomFileName(@Nullable final String prefix)

Description

Generate a random filename with a specified prefix.

License

Apache License

Parameter

Parameter	Description
prefix	the prefix of the temporary filename.

Return

a random filename with the specified prefix.

Declaration

public static String getRandomFileName(@Nullable final String prefix) 

Method Source Code

//package com.java2s;
/*//w  w  w. ja v  a 2 s  .c o m
 * Copyright (c) 2014  Haixing Hu
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

import java.text.SimpleDateFormat;
import java.util.Date;

import javax.annotation.Nullable;
import javax.annotation.concurrent.GuardedBy;

public class Main {
    @GuardedBy(value = "itself")
    private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss-SSS");

    /**
     * Generate a random filename with a specified prefix.
     *
     * @param prefix
     *          the prefix of the temporary filename.
     * @return a random filename with the specified prefix.
     */
    public static String getRandomFileName(@Nullable final String prefix) {
        final Date now = new Date(System.currentTimeMillis());
        String dateStr = null;
        synchronized (DATE_FORMAT) {
            dateStr = DATE_FORMAT.format(now);
        }
        if ((prefix == null) || (prefix.length() == 0)) {
            return dateStr;
        } else {
            return prefix + '_' + dateStr;
        }
    }
}

Related

1. generateFileId(String userlogin)
2. generateFileName()
3. generateFileName()
4. generateFileName(String fileName)
5. generateFileNameWithoutExtension(final String testClassName, final String testId, final boolean includeDate)
6. toFileName(final Object obj)
7. toFileName(String address)
8. toFileName(String className)
9. toFilename(String filenameOrURI)