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Ganymed SSH-2 for Java系列7之删除远程服务器上的非空目录（方法说明）

来源：互联网 发布：淘宝店铺菜单css代码 编辑：程序博客网 时间：2024/05/06 03:08

首先大家看看这段java代码的打印结果：

 Vector v1 = sftpClient.ls(remoteDerectory); for (Iterator iterator2 = v1.iterator(); iterator2 .hasNext();) { SFTPv3DirectoryEntry ob = (SFTPv3DirectoryEntry) iterator2.next(); System.out.println("--------******************----------"); System.out.println("ob.longEntry is:" + ob.longEntry); System.out.println("ob.filename is:" + ob.filename); System.out.println("ob.attributes.isDirectory() is:" + ob.attributes.isDirectory()); System.out.println("ob.attributes.size is:" + ob.attributes.size); System.out.println("--------******************----------"); } }


结果：
--------******************----------
ob.longEntry is:drwxr-xr-x    3 root     root         4096 Mar  3 09:32 .
ob.filename is:.
ob.attributes.isDirectory() is:true
ob.attributes.size is:4096
--------******************----------
--------******************----------
ob.longEntry is:drwxr-xr-x    3 root     root         4096 Mar  3 09:31 ..
ob.filename is:..
ob.attributes.isDirectory() is:true
ob.attributes.size is:4096
--------******************----------
--------******************----------
ob.longEntry is:drwxr-xr-x    2 root     root         4096 Mar  3 09:32 t
ob.filename is:t
ob.attributes.isDirectory() is:true
ob.attributes.size is:4096
--------******************----------
--------******************----------
ob.longEntry is:-rw-r--r--    1 root     root            6 Mar  3 09:31 t.txt
ob.filename is:t.txt
ob.attributes.isDirectory() is:false
ob.attributes.size is:6
--------******************----------


故才有之前的方法：


List<String> filelist = new ArrayList<String>();List<String> direlist = new ArrayList<String>();direlist.add(remoteDerectory);

定义存放文件和目录的List，其存放的是全路径：

如：

fileLIst：

/usr/local/test/tt.txt


direlist：
/usr/local/test/tt/t


列出所有目录和文件信息：

Vector v = sftpClient.ls(remoteDerectory);

遍历目录和文件信息，存入定义好的对象中：

getUrlPath(sftpClient, filelist, direlist, remoteDerectory);

逆向删除目录和文件：


System.out.println("file list is：：");for (int i = filelist.size() - 1; i > -1; i--) {System.out.println(filelist.get(i));sftpClient.rm(filelist.get(i));}System.out.println("directory list is：：");for (int i = direlist.size() - 1; i > -1; i--) {System.out.println(direlist.get(i));sftpClient.rmdir(direlist.get(i));}


这个和之前存入list的顺序有关；


private static void getUrlPath(SFTPv3Client sftpClient,List<String> filelist, List<String> direlist, String remoteDerectory)throws IOException {Vector v = sftpClient.ls(remoteDerectory);for (Iterator iterator = v.iterator(); iterator.hasNext();) {SFTPv3DirectoryEntry object = (SFTPv3DirectoryEntry) iterator.next();System.out.println(object.filename);if (object.attributes.isDirectory()&& object.filename.indexOf(".") == -1) {String rderectory = remoteDerectory + "/" + object.filename;direlist.add(rderectory);getUrlPath(sftpClient, filelist, direlist, rderectory);} else if (!object.filename.startsWith(".")&& !object.filename.endsWith(".")) {String path = remoteDerectory + "/" + object.filename;filelist.add(path);}}}

这个方法内部有个递归调用，将所有的文件和目录信息存入对应的对象中；


if (!object.filename.startsWith(".")&& !object.filename.endsWith("."))

这个判断主要是排除：

--------******************----------
ob.longEntry is:drwxr-xr-x    3 root     root         4096 Mar  3 09:31 ..
ob.filename is:..
ob.attributes.isDirectory() is:true
ob.attributes.size is:4096
--------******************----------

类似这样的信息；判断不严格。


我们再看看：

Vector v = sftpClient.ls(remoteDerectory);for (Iterator iterator = v.iterator(); iterator.hasNext();) {SFTPv3DirectoryEntry object = (SFTPv3DirectoryEntry) iterator.next();

为什么Vector中存放的是
SFTPv3DirectoryEntry

这个对象，可以查看源码：

/** * List the contents of a directory. *  * @param dirName See the {@link SFTPv3Client comment} for the class for more details. * @return A Vector containing {@link SFTPv3DirectoryEntry} objects. * @throws IOException */public Vector ls(String dirName) throws IOException{byte[] handle = openDirectory(dirName);Vector result = scanDirectory(handle);closeHandle(handle);return result;}
继续查看：

Vector result = scanDirectory(handle);

private final Vector scanDirectory(byte[] handle) throws IOException{Vector files = new Vector();while (true){int req_id = generateNextRequestID();TypesWriter tw = new TypesWriter();tw.writeString(handle, 0, handle.length);if (debug != null){debug.println("Sending SSH_FXP_READDIR...");debug.flush();}sendMessage(Packet.SSH_FXP_READDIR, req_id, tw.getBytes());byte[] resp = receiveMessage(34000);if (debug != null){debug.println("Got REPLY.");debug.flush();}TypesReader tr = new TypesReader(resp);int t = tr.readByte();int rep_id = tr.readUINT32();if (rep_id != req_id)throw new IOException("The server sent an invalid id field.");if (t == Packet.SSH_FXP_NAME){int count = tr.readUINT32();if (debug != null)debug.println("Parsing " + count + " name entries...");while (count > 0){SFTPv3DirectoryEntry dirEnt = new SFTPv3DirectoryEntry();dirEnt.filename = tr.readString(charsetName);dirEnt.longEntry = tr.readString(charsetName);dirEnt.attributes = readAttrs(tr);files.addElement(dirEnt);if (debug != null)debug.println("File: '" + dirEnt.filename + "'");count--;}continue;}if (t != Packet.SSH_FXP_STATUS)throw new IOException("The SFTP server sent an unexpected packet type (" + t + ")");int errorCode = tr.readUINT32();if (errorCode == ErrorCodes.SSH_FX_EOF)return files;throw new SFTPException(tr.readString(), errorCode);}}

首先定义了：
Vector files = new Vector();

最后存放的是：
files.addElement(dirEnt);

在看看：SFTPv3DirectoryEntry对象定义：
public class SFTPv3DirectoryEntry{/** *  A relative name within the directory, without any path components. */public String filename;/** * An expanded format for the file name, similar to what is returned by * "ls -l" on Un*x systems. * <p> * The format of this field is unspecified by the SFTP v3 protocol. * It MUST be suitable for use in the output of a directory listing * command (in fact, the recommended operation for a directory listing * command is to simply display this data).  However, clients SHOULD NOT * attempt to parse the longname field for file attributes; they SHOULD * use the attrs field instead. * <p> * The recommended format for the longname field is as follows:<br> * <code>-rwxr-xr-x   1 mjos     staff      348911 Mar 25 14:29 t-filexfer</code> */public String longEntry;/** * The attributes of this entry. */public SFTPv3FileAttributes attributes;

其包含了三个基本属性，分别是：
filename 文件或者目录名称；
longEntry  目录（d）权限等基本信息：例如：drwxr-xr-x    2 root     root         4096 Mar  3 09:32 t 或者 -rw-r--r--    1 root     root            3 Mar  3 09:31 tt.txt
SFTPv3FileAttributes 定义了entry 属性对象，存放是否是目录，权限等基础信息；

继续查看源码：
public class SFTPv3FileAttributes{/** * The SIZE attribute. <code>NULL</code> if not present. */public Long size = null;/** * The UID attribute. <code>NULL</code> if not present. */public Integer uid = null;/** * The GID attribute. <code>NULL</code> if not present. */public Integer gid = null;/** * The POSIX permissions. <code>NULL</code> if not present. * <p> * Here is a list: * <p> * <pre>Note: these numbers are all OCTAL. *   *  S_IFMT     0170000   bitmask for the file type bitfields *  S_IFSOCK   0140000   socket *  S_IFLNK    0120000   symbolic link *  S_IFREG    0100000   regular file *  S_IFBLK    0060000   block device *  S_IFDIR    0040000   directory *  S_IFCHR    0020000   character device *  S_IFIFO    0010000   fifo  *  S_ISUID    0004000   set UID bit *  S_ISGID    0002000   set GID bit  *  S_ISVTX    0001000   sticky bit *   *  S_IRWXU    00700     mask for file owner permissions *  S_IRUSR    00400     owner has read permission *  S_IWUSR    00200     owner has write permission *  S_IXUSR    00100     owner has execute permission *  S_IRWXG    00070     mask for group permissions *  S_IRGRP    00040     group has read permission *  S_IWGRP    00020     group has write permission *  S_IXGRP    00010     group has execute permission *  S_IRWXO    00007     mask for permissions for others (not in group) *  S_IROTH    00004     others have read permission *  S_IWOTH    00002     others have write permisson *  S_IXOTH    00001     others have execute permission * </pre> */public Integer permissions = null;/** * The ATIME attribute. Represented as seconds from Jan 1, 1970 in UTC. * <code>NULL</code> if not present. */public Integer atime = null;/** * The MTIME attribute. Represented as seconds from Jan 1, 1970 in UTC. * <code>NULL</code> if not present. */public Integer mtime = null;/** * Checks if this entry is a directory. *  * @return Returns true if permissions are available and they indicate *         that this entry represents a directory. */public boolean isDirectory(){if (permissions == null)return false;return ((permissions.intValue() & 0040000) != 0);}/** * Checks if this entry is a regular file. *  * @return Returns true if permissions are available and they indicate *         that this entry represents a regular file. */public boolean isRegularFile(){if (permissions == null)return false;return ((permissions.intValue() & 0100000) != 0);}/** * Checks if this entry is a a symlink. *  * @return Returns true if permissions are available and they indicate *         that this entry represents a symlink. */public boolean isSymlink(){if (permissions == null)return false;return ((permissions.intValue() & 0120000) != 0);}/** * Turn the POSIX permissions into a 7 digit octal representation. * Note: the returned value is first masked with <code>0177777</code>. *  * @return <code>NULL</code> if permissions are not available. */public String getOctalPermissions(){if (permissions == null)return null;String res = Integer.toString(permissions.intValue() & 0177777, 8);StringBuffer sb = new StringBuffer();int leadingZeros = 7 - res.length();while (leadingZeros > 0){sb.append('0');leadingZeros--;}sb.append(res);return sb.toString();}}

这个里面基本定义了权限，是否是目录等基本信息；




                                             
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 淘宝店铺菜单css代码
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