linux如何重新配置FTP文件，我是新手，配置的时候被我弄错了！

那就可以重新生成配置文件，可以用yum源 yum remove vsftp -y 卸载后，重新在安装一下，就可以了
下面是：Linux FTP配置文件说明
一vsftpd说明:
LINUX下实现FTP服务的软件很多,最常见的有vsftpd,Wu-ftpd和Proftp等Red Hat Enterprise Linux中默认安装的是vsftpd
访问FTP服务器时需要经过验证,只有经过了FTP服务器的相关验证,用户才能访问和传输文件vsftpd提供了3种ftp登录形式:
(1)anonymous(匿名帐号)
使用anonymous是应用广泛的一种FTP服务器如果用户在FTP服务器上没有帐号,那么用户可以以anonymous为用户名,以自己的电子邮件地址为密码进行登录当匿名用户登录FTP服务器后,其登录目录为匿名FTP服务器的根目录/var/ftp为了减轻FTP服务器的负载,一般情况下,应关闭匿名帐号的上传功能
(2)real(真实帐号)
real也称为本地帐号,就是以真实的用户名和密码进行登录,但前提条件是用户在FTP服务器上拥有自己的帐号用真实帐号登录后,其登录的目录为用户自己的目录,该目录在系统建立帐号时系统就自动创建
(3)guest(虚拟帐号)
如果用户在FTP服务器上拥有帐号,但此帐号只能用于文件传输服务,那么该帐号就是guest,guest是真实帐号的一种形式,它们的不同之处在于,geust登录FTP服务器后,不能访问除宿主目录以外的内容

二FTP相关配置文件说明
其相关配置文件有/etc/vsftpd/vsftpdconf, /etc/vsftpdftpusers, /etc/vsftpduser_list,在配置FTP服务器时,主要是修改这些文件中的相关语句
1vsftpdconf文件说明
# Example config file /etc/vsftpd/vsftpdconf
#
# The default compiled in settings are fairly paranoid This sample file
# loosens things up a bit, to make the ftp daemon more usable
# Please see vsftpdconf5 for all compiled in defaults
#
# READ THIS: This example file is NOT an exhaustive list of vsftpd options
# Please read the vsftpdconf5 manual page to get a full idea of vsftpd's
# capabilities
#
# Allow anonymous FTP (Beware - allowed by default if you comment this out)
anonymous_enable=YES //是否允许anonymous登录FTP服务器,默认是允许的
#
# Uncomment this to allow local users to log in
local_enable=YES //是否允许本地用户登录FTP服务器,默认是允许
#
# Uncomment this to enable any form of FTP write command
write_enable=YES //是否允许用户具有在FTP服务器文件中执行写的权限,默认是允许
#
# Default umask for local users is 077 You may wish to change this to 022,
# if your users expect that (022 is used by most other ftpd's)
local_umask=022 //设置本地用户的文件生成掩码为022,默认是077
#
# Uncomment this to allow the anonymous FTP user to upload files This only
# has an effect if the above global write enable is activated Also, you will
# obviously need to create a directory writable by the FTP user
#anon_upload_enable=YES
#
# Uncomment this if you want the anonymous FTP user to be able to create
# new directories
#anon_mkdir_write_enable=YES //是否允许匿名账户在FTP服务器中创建目录
#
# Activate directory messages - messages given to remote users when they
# go into a certain directory
dirmessage_enable=YES //激活目录信息,当远程用户更改目录时,将出现提示信息
#
# Activate logging of uploads/downloads
xferlog_enable=YES //启用上传和下载日志功能
#
# Make sure PORT transfer connections originate from port 20 (ftp-data)
connect_from_port_20=YES //启用FTP数据端口的连接请求
#
# If you want, you can arrange for uploaded anonymous files to be owned by
# a different user Note! Using "root" for uploaded files is not
# recommended!
#chown_uploads=YES
#chown_username=whoever
#
# You may override where the log file goes if you like The default is shown
# below
#xferlog_file=/var/log/vsftpdlog //设置日志文件的文件名和存储路径,这是默认的
#
# If you want, you can have your log file in standard ftpd xferlog format
xferlog_std_format=YES//是否使用标准的ftpd xferlog日志文件格式
#
# You may change the default value for timing out an idle session
#idle_session_timeout=600 //设置空闲的用户会话中断时间,默认是10分钟
#
# You may change the default value for timing out a data connection
#data_connection_timeout=120//设置数据连接超时时间,默认是120秒
#
# It is recommended that you define on your system a unique user which the
# ftp server can use as a totally isolated and unprivileged user
#nopriv_user=ftpsecure
#
# Enable this and the server will recognise asynchronous ABOR requests Not
# recommended for security (the code is non-trivial) Not enabling it,
# however, may confuse older FTP clients
#async_abor_enable=YES
#
# By default the server will pretend to allow ASCII mode but in fact ignore
# the request Turn on the below options to have the server actually do ASCII
# mangling on files when in ASCII mode
# Beware that turning on ascii_download_enable enables malicious remote parties
# to consume your I/O resources, by issuing the command "SIZE /big/file" in
# ASCII mode
# These ASCII options are split into upload and download because you may wish
# to enable ASCII uploads (to prevent uploaded scripts etc from breaking),
# without the DoS risk of SIZE and ASCII downloads ASCII mangling should be
# on the client anyway
#ascii_upload_enable=YES
#ascii_download_enable=YES //是否允许使用ASCII格式来上传和下载文件
#
# You may fully customise the login banner string:
#ftpd_banner=Welcome to blah FTP service//在FTP服务器中设置欢迎登录的信息
#
# You may specify a file of disallowed anonymous e-mail addresses Apparently
# useful for combatting certain DoS attacks
#deny_email_enable=YES
# (default follows)
#banned_email_file=/etc/vsftpdbanned_emails
#
# You may specify an explicit list of local users to chroot() to their home
# directory If chroot_local_user is YES, then this list becomes a list of
# users to NOT chroot()
#chroot_list_enable=YES //如果希望用户登录后不能切换到自己目录以外的其它目录,需要设置该项,如果设置chroot_list_enable=YES,那么只允许/etc/vsftpdchroot_list中列出的用户具有该功能如果希望所有的本地用户都执行者chroot,可以增加一行:chroot_local_user=YES
# (default follows)
#chroot_list_file=/etc/vsftpdchroot_list
#
# You may activate the "-R" option to the builtin ls This is disabled by
# default to avoid remote users being able to cause excessive I/O on large
# sites However, some broken FTP clients such as "ncftp" and "mirror" assume
# the presence of the "-R" option, so there is a strong case for enabling it
#ls_recurse_enable=YES
pam_service_name=vsftpd //设置PAM认证服务的配置文件名称,该文件存放在/etc/pamd/目录下
userlist_enable=YES //用户列表中的用户是否允许登录FTP服务器,默认是不允许
#enable for standalone mode
listen=YES //使vsftpd 处于独立启动模式
tcp_wrappers=YES //使用tcp_wrqppers作为主机访问控制方式
2vsftpdftpusers文件说明
这个文件是用来记录"不允许"登录到FTP服务器的用户,通常是一些系统默认的用户
下面是该文件中默认的不允许登录的名单:
# Users that are not allowed to login via ftp
root //默认情况下,root和它以下的用户是不允许登录FTP服务器的可以将不允许登录的用户添加到这里来但切记每个用户都要单独占用一行
bin
daemon
adm
lp
sync
shutdown
halt
mail
news
uucp
operator
games
nobody
3vsftpduser_list文件说明
其实它的内容跟上面那个文件内容一样,只是在系统对文件vsftpdconf 进行检测时,会检测到"userlist_deny=YES",因此这个文件必须存在下面是这个文件的内容
# vsftpd userlist
# If userlist_deny=NO, only allow users in this file
# If userlist_deny=YES (default), never allow users in this file, and
# do not even prompt for a password
# Note that the default vsftpd pam config also checks /etc/vsftpdftpusers
# for users that are denied
root
bin
daemon
adm
lp
sync
shutdown
halt
mail
news
uucp
operator
games
nobody

android开发中，用户的密码肯定是放在服务器端的数据库中的，这一点毫无疑问。若要实现用户密码的修改，首先服务器端必须要有用户修改密码的端口。如果服务器端都不允许你修改密码，那么这一功能根本不可能实现。
若是服务器端允许用户修改密码，那么原理就是根据用户注册时返回的userid(通常用sharedpreference用户手机本地文件中)来查询服务器端的数据库中该用户的账号密码数据，然后进行更新。用户发出修改密码这样的请求后，服务器根据用户提交的信息对数据库更新。手机端只是一个请求，更多的 *** 作要放在服务器端。
详细做法无法赘述。大致是，写好用户修改密码的页面之后，在该Activity中用map或者namevalue装载修改的密码和其他必须的参数，然后在提交按钮的的监听事件里发送请求至服务器（当然发送请求获取数据这些 *** 作别放进主线程，写个异步任务类。），服务器读取用户请求，更新数据库。至于密码类型长度这些要求的判断最好直接在装载数据前就判断，减轻服务器压力。

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