FTP 协议命令参数详解

若是想本身编写一个FTP客户端程序，首先得搞清楚FTP协议中的这些命令和用法。 FTP COMMANDS          The following are the FTP commands:             USER <SP> <username> <CRLF>       登陆的用户名             PASS <SP> <password> <CRLF>       密码             ACCT <SP> <account-information> <CRLF>             CWD  <SP> <pathname> <CRLF>       改变当前目录             CDUP <CRLF>                       返回上级目录             SMNT <SP> <pathname> <CRLF>             QUIT <CRLF>                       退出             REIN <CRLF>                       从新登陆             PORT <SP> <host-port> <CRLF>             PASV <CRLF>                       获取数据传输端口             TYPE <SP> <type-code> <CRLF>      设置数据交换的类型{A(SCII),E(BCDIC),I(mage),L(ocal byte size)}             STRU <SP> <structure-code> <CRLF>             MODE <SP> <mode-code> <CRLF>             RETR <SP> <pathname> <CRLF>             STOR <SP> <pathname> <CRLF>       用覆盖方式上传一个文件到服务器             STOU <CRLF>             APPE <SP> <pathname> <CRLF>       用追加方式上传一个文件到服务器             ALLO <SP> <decimal-integer>                 [<SP> R <SP> <decimal-integer>] <CRLF>             REST <SP> <marker> <CRLF>         指定从新下在的字节数             RNFR <SP> <pathname> <CRLF>       指定须要更名的原文件             RNTO <SP> <pathname> <CRLF>       指定须要更名的新文件名             ABOR <CRLF>                       取消前一指令             DELE <SP> <pathname> <CRLF>       在服务器上删除指定文件             RMD  <SP> <pathname> <CRLF>       在服务器上删除指定目录             MKD  <SP> <pathname> <CRLF>       在服务器上建立目录                    PWD  <CRLF>                       显示当前目录             LIST [<SP> <pathname>] <CRLF>     列出当前目录下全部文件和子目录             NLST [<SP> <pathname>] <CRLF>     列出当前目录下全部文件和子目录的名字             SITE <SP> <string> <CRLF>             SYST <CRLF>             STAT [<SP> <pathname>] <CRLF>             HELP [<SP> <string>] <CRLF>       获取帮助             NOOP <CRLF> FTP Security commands and arguments       AUTH <SP> <mechanism-name> <CRLF>       ADAT <SP> <base64data> <CRLF>       PROT <SP> <prot-code> <CRLF>       PBSZ <SP> <decimal-integer> <CRLF>       MIC <SP> <base64data> <CRLF>       CONF <SP> <base64data> <CRLF>       ENC <SP> <base64data> <CRLF>       <mechanism-name> ::= <string>       <base64data> ::= <string>               ; must be formatted as described in section 9       <prot-code> ::= C | S | E | P       <decimal-integer> ::= any decimal integer from 1 to (2^32)-1     上面是一些ftp协议支持的命令，下面介绍一些使用实例 FTP 协议命令实战

废话就很少说了，下面是用TELNET链接Serv-U测试成功的例子 下载文件 --------------------------------------------------------------------------- TELNET 127.0.0.1 21 220 Serv-U FTP Server v4.0 for WinSock ready... USER ADMIN 331 User name okay, need password. PASS **** 230 User logged in, proceed. PASV 227 Entering Passive Mode <127,0,0,1,4,191> REST 0 350 Restarting at 0. Send STORE or RETRIEVE. RETR test.rar 150 Opening ASCII mode data connection for test.rar <94370 bytes>. 226 Transfer complete.     覆盖方式上传文件 --------------------------------------------------------------------------- TELNET 127.0.0.1 21 220 Serv-U FTP Server v4.0 for WinSock ready... USER ADMIN 331 User name okay, need password. PASS **** 230 User logged in, proceed. STOR test.dat 150 Opening ASCII mode data connection for test.dat PASV 227 Entering Passive Mode <127,0,0,1,4,191> ...建立另外一条链接到指定端口而后向其发送数据...     追加方式上传文件 --------------------------------------------------------------------------- TELNET 127.0.0.1 21 220 Serv-U FTP Server v4.0 for WinSock ready... USER ADMIN 331 User name okay, need password. PASS **** 230 User logged in, proceed. APPE test.dat 150 Opening ASCII mode data connection for test.dat PASV 227 Entering Passive Mode <127,0,0,1,4,191> ...建立另外一条链接到指定端口而后向其发送数据...     重命名文件和目录 --------------------------------------------------------------------------- TELNET 127.0.0.1 21 220 Serv-U FTP Server v4.0 for WinSock ready... USER ADMIN 331 User name okay, need password. PASS **** 230 User logged in, proceed. RNFR sss.rar 350 File or directory exists; ready for destination name RNTO stock.rar 250 RNTO command successfull.     删除文件 --------------------------------------------------------------------------- TELNET 127.0.0.1 21 220 Serv-U FTP Server v4.0 for WinSock ready... USER ADMIN 331 User name okay, need password. PASS **** 230 User logged in, proceed. DELE test.dat 250 DELE command successfull.     创建和删除目录 --------------------------------------------------------------------------- TELNET 127.0.0.1 21 220 Serv-U FTP Server v4.0 for WinSock ready... USER ADMIN 331 User name okay, need password. PASS **** 230 User logged in, proceed. MKD myDir 257 "/myDir" directory created. RMD myDir 250 RMD command successfull.     退出链接 --------------------------------------------------------------------------- TELNET 127.0.0.1 21 220 Serv-U FTP Server v4.0 for WinSock ready... USER ADMIN 331 User name okay, need password. PASS **** 230 User logged in, proceed. QUIT221 Goodbye!