设置Posix所有者

/*-

 * 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.nowjava;

import java.lang.reflect.Array;
/*
时代Java
*/

import java.lang.reflect.Field;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;


public class Main {

    public static void setPosixOwners(String path, int ownerId, int groupId)

            throws ClassNotFoundException, NoSuchMethodException,

            IllegalAccessException, IllegalArgumentException,

            InvocationTargetException, NoSuchFieldException {

        Class<?> fileSystemsClass = Class
        /**
         from
        * 时 代 J a v a 公 众 号 - N o w J a v  a . c o m 
        **/

                .forName("java.nio.file.FileSystems");

        Class<?> fileSystemClass = Class

                .forName("java.nio.file.FileSystem");

        Class<?> pathClass = Class.forName("java.nio.file.Path");

        Class<?> filesClass = Class.forName("java.nio.file.Files");

        Class<?> linkOptionClass = Class

                .forName("java.nio.file.LinkOption");


        Method fileSystemsGetDefaultMethod = fileSystemsClass

                .getMethod("getDefault");

        Method fileSystemGetPathMethod = fileSystemClass.getMethod(

                "getPath", String.class, String[].class);


        Field noFollowLinksField = linkOptionClass

                .getField("NOFOLLOW_LINKS");


        Object noFollowLinksObject = noFollowLinksField.get(null);

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

        Array.set(linkOptionsArray, 0, noFollowLinksObject);


        /* java.nio.file.FileSystem defaultFileSystem =

                   java.nio.file.FileSystems.getDefault(); */

        Object defaultFileSystemObject = fileSystemsGetDefaultMethod

                .invoke(null);


        /* java.nio.file.Path p = defaultFileSystem.getPath(path); */

        Object pObject = fileSystemGetPathMethod.invoke(

                defaultFileSystemObject, path, new String[0]);


        Method filesSetAttributeMethod = filesClass.getMethod(

                "setAttribute", pathClass, String.class, Object.class,

                linkOptionsArray.getClass());

        try {

            /* java.nio.file.Files.setAttribute(p, "unix:uid",

                    Integer.valueOf(ownerId),

                    java.nio.file.LinkOption.NOFOLLOW_LINKS);*/

            filesSetAttributeMethod.invoke(null, pObject, "unix:uid",

                    Integer.valueOf(ownerId), linkOptionsArray);


            /* java.nio.file.Files.setAttribute(p, "unix:gid",

                    Integer.valueOf(groupId),

                    java.nio.file.LinkOption.NOFOLLOW_LINKS); */

            filesSetAttributeMethod.invoke(null, pObject, "unix:gid",

                    Integer.valueOf(groupId), linkOptionsArray);

        } catch (InvocationTargetException ex) {

            final Throwable cause = ex.getCause();

            if (cause instanceof UnsupportedOperationException) {

                /* Do nothing. This is expected on non-UNIX platforms. */

            } else if (cause instanceof ClassNotFoundException) {

                throw (ClassNotFoundException) cause;

            } else if (cause instanceof NoSuchMethodException) {

                throw (NoSuchMethodException) cause;

            } else if (cause instanceof IllegalAccessException) {

                throw (IllegalAccessException) cause;

            } else