package Utils.GenerateNewFileName;

import java.util.UUID;

public class FileUtils {

    /**

         * 获取文件的新名称

         * @param fileName 文件名

         * @return 文件新生成的名称

         */

        public static String getNewFileName(String fileName) {

            StringBuffer newFileName = new StringBuffer();

            String extension = fileName.substring(fileName.lastIndexOf('.'));

            newFileName.append(UUID.randomUUID().toString());

            newFileName.append(extension);

            return newFileName.toString();

        }

        public static String getNewFileNameWithTimeStamp(String fileName) {

            StringBuffer newFileName = new StringBuffer();

            String extension = fileName.substring(fileName.lastIndexOf('.'));

            newFileName.append(System.currentTimeMillis());

            newFileName.append(extension);

            return newFileName.toString();

        }

}

package Utils.GenerateNewFileName;

import org.junit.Test;

public class TestUtils {

    @Test

    public void Test1(){

        System.out.println(FileUtils.getNewFileName("1.DOC"));

        System.out.println(FileUtils.getNewFileName("1.X.DOCX"));

        System.out.println(FileUtils.getNewFileNameWithTimeStamp("1.X.DOCX"));

        System.out.println(FileUtils.getNewFileNameWithTimeStamp("1.DOCX"));

    }

}

e02fd6b0-8e05-4762-a333-6d71ba2e0cb2.DOC
f703af3a-4213-41dd-a6e7-217c59045879.DOCX
1505551091376.DOCX
1505551091376.DOCX