set File Times - Java File Path IO

Description

set File Times
Demo Code

/*-//from  ww w . ja va2  s  .  c o  m
 * Copyright (C) 2014 Erik Larsson
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
//package com.java2s;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Date;

public class Main {
    public static void setFileTimes(String path, Date creationTime,
            Date lastAccessTime, Date lastModifiedTime)
            throws ClassNotFoundException, NoSuchMethodException,
            IllegalAccessException, IllegalArgumentException,
            InvocationTargetException, NoSuchFieldException {
        Class<?> pathClass = Class.forName("java.nio.file.Path");
        Class<?> fileSystemsClass = Class
                .forName("java.nio.file.FileSystems");
        Class<?> fileSystemClass = Class
                .forName("java.nio.file.FileSystem");
        Class<?> basicFileAttributeViewClass = Class
                .forName("java.nio.file.attribute.BasicFileAttributeView");
        Class<?> filesClass = Class.forName("java.nio.file.Files");
        Class<?> linkOptionClass = Class
                .forName("java.nio.file.LinkOption");
        Class<?> fileTimeClass = Class
                .forName("java.nio.file.attribute.FileTime");

        /* FileSystem defaultFileSystem = FileSystems.getDefault(); */
        Method fileSystemsGetDefaultMethod = fileSystemsClass
                .getMethod("getDefault");
        Object defaultFileSystemObject = fileSystemsGetDefaultMethod
                .invoke(null);

        /* Path p = defaultFileSystem.getPath(path); */
        Method fileSystemGetPathMethod = fileSystemClass.getMethod(
                "getPath", String.class, String[].class);
        Object pObject = fileSystemGetPathMethod.invoke(
                defaultFileSystemObject, path, new String[0]);

        /* BasicFileAttributeView attrView =
         *         Files.getFileAttributeView(p, BasicFileAttributeView.class,
         *         LinkOption.NOFOLLOW_LINKS); */
        Field noFollowLinksField = linkOptionClass
                .getField("NOFOLLOW_LINKS");
        Object noFollowLinksObject = noFollowLinksField.get(null);

        Object linkOptionsArray = Array.newInstance(linkOptionClass, 1);
        Array.set(linkOptionsArray, 0, noFollowLinksObject);

        Method getFileAttributeViewMethod = filesClass.getMethod(
                "getFileAttributeView", pathClass, Class.class,
                linkOptionsArray.getClass());
        Object attrViewObject = getFileAttributeViewMethod.invoke(null,
                pObject, basicFileAttributeViewClass, linkOptionsArray);

        /*
         * FileTime creationFileTime;
         * if(creationTime != null) {
         *     creationFileTime = FileTime.fromMillis(creationTime.getTime());
         * }
         * else {
         *     creationFileTime = null;
         * }
         */
        Object creationFileTimeObject;
        if (creationTime != null) {
            Method fileTimefromMillisMethod = fileTimeClass.getMethod(
                    "fromMillis", long.class);
            creationFileTimeObject = fileTimefromMillisMethod.invoke(null,
                    Long.valueOf(creationTime.getTime()));
        } else {
            creationFileTimeObject = null;
        }

        /*
         * FileTime lastAccessFileTime;
         * if(lastAccessTime != null) {
         *     lastAccessFileTime =
         *         FileTime.fromMillis(lastAccessTime.getTime());
         * }
         * else {
         *     lastAccessFileTime = null;
         * }
         */
        Object lastAccessFileTimeObject;
        if (lastAccessTime != null) {
            Method fileTimefromMillisMethod = fileTimeClass.getMethod(
                    "fromMillis", long.class);
            lastAccessFileTimeObject = fileTimefromMillisMethod.invoke(
                    null, Long.valueOf(lastAccessTime.getTime()));
        } else {
            lastAccessFileTimeObject = null;
        }

        /*
         * FileTime lastModifiedFileTime;
         * if(lastModifiedTime != null) {
         *     lastModifiedFileTime =
         *         FileTime.fromMillis(lastModifiedTime.getTime());
         * }
         * else {
         *     lastModifiedFileTime = null;
         * }
         */
        Object lastModifiedFileTimeObject;
        if (lastModifiedTime != null) {
            Method fileTimefromMillisMethod = fileTimeClass.getMethod(
                    "fromMillis", long.class);
            lastModifiedFileTimeObject = fileTimefromMillisMethod.invoke(
                    null, Long.valueOf(lastModifiedTime.getTime()));
        } else {
            lastModifiedFileTimeObject = null;
        }

        /* attrView.setTimes(lastModifiedFileTime, lastAccessFileTime,
         *     creationFileTime); */
        Method basicFileAttributeViewSetTimesMethod = basicFileAttributeViewClass
                .getMethod("setTimes", fileTimeClass, fileTimeClass,
                        fileTimeClass);
        try {
            basicFileAttributeViewSetTimesMethod.invoke(attrViewObject,
                    lastModifiedFileTimeObject, lastAccessFileTimeObject,
                    creationFileTimeObject);
        } catch (InvocationTargetException ex) {
            final Throwable cause = ex.getCause();
            if (cause instanceof ClassNotFoundException) {
                throw (ClassNotFoundException) cause;
            } else if (cause instanceof NoSuchMethodException) {
                throw (NoSuchMethodException) cause;
            } else if (cause instanceof IllegalAccessException) {
                throw (IllegalAccessException) cause;
            } else if (cause instanceof IllegalArgumentException) {
                throw (IllegalArgumentException) cause;
            } else if (cause instanceof InvocationTargetException) {
                throw (InvocationTargetException) cause;
            } else if (cause instanceof NoSuchFieldException) {
                throw (NoSuchFieldException) cause;
            } else if (cause instanceof RuntimeException) {
                throw (RuntimeException) cause;
            } else {
                throw ex;
            }
        }
    }
}
set File Times - Java File Path IO

Description

Demo Code

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