Some Applications of commons-net3

Example of FTP upload/download:

Import java. io. file; import java. io. fileOutputStream; import java. io. IOException; import java. io. inputStream; import java. io. outputStream; import org.apache.commons.net. ftp. FTPClient; import org.apache.commons.net. ftp. FTPFile; import org.apache.commons.net. ftp. FTPReply; public class TestUploadDownload {/*** Description: upload a file to the FTP server * @ param url FTP Server hostname * @ param port FTP server port * @ param usern Ame FTP login account * @ param password FTP login password * @ param path FTP server storage directory * @ param filename file name uploaded to the FTP server * @ param input stream * @ return success return true, otherwise, false */public boolean uploadFile (String url, int port, String username, String password, String path, String filename, InputStream input) is returned) {// boolean success = false indicates that the Upload Failed; // create the FTPClient object FTPClient ftp = new FTPClient (); try {int reply; // connect to the FTP server // as shown in Figure If you use the default port, you can use ftp. connect (url) directly to the FTP Server ftp. connect (url, port); // log on to ftp. login (username, password); // check whether the returned value is 230. If yes, the login is successful. reply = ftp. getReplyCode (); // the return value starting with 2 is true if (! FTPReply. isPositiveCompletion (reply) {ftp. disconnect (); return success;} // go to the specified upload directory ftp. changeWorkingDirectory (path); // stores the uploaded file to the specified directory ftp. storeFile (filename, input); // close the input stream input. close (); // exit ftp. logout (); // indicates that the upload is successful. success = true;} catch (IOException e) {e. printStackTrace ();} finally {if (ftp. isConnected () {try {ftp. disconnect () ;}catch (IOException ioe) {}} return success; }/*** Description: download the file from the FTP server * @ param url FTP Server hostname * @ param port FTP server port * @ param username FTP login account * @ param password FTP login password * @ param remotePath FTP Server * @ param fileName: the file name to be downloaded * @ param localPath: The local path * @ return */public boolean downFile (String url, int port, String username, String password, String remotePath, String fileName, String localPath) {// indicates a download failure boolean succe Ss = false; // create FTPClient object FTPClient ftp = new FTPClient (); try {int reply; // connect to the FTP server // if the default port is used, you can use ftp. connect (url) directly to the FTP Server ftp. connect (url, port); // log on to ftp. login (username, password); reply = ftp. getReplyCode (); if (! FTPReply. isPositiveCompletion (reply) {ftp. disconnect (); return success;} // go to the specified download directory ftp. changeWorkingDirectory (remotePath); // list all the files in this directory. FTPFile [] fs = ftp. listFiles (); // traverse all files and find the specified file for (FTPFile ff: fs) {if (ff. getName (). equals (fileName) {// initialize the File localFile = new File (localPath + "/" + ff. getName (); // output stream OutputStream is = new FileOutputStream (localFile); // download the file ftp. retrieveFile (ff. getName (), is); is. close () ;}// exit ftp. logout (); // success = true;} catch (IOException e) {e. printStackTrace ();} finally {if (ftp. isConnected () {try {ftp. disconnect ();} catch (IOException ioe) {}} return success;}/*** @ param args */public static void main (String [] args) {// TODO Auto-generated method stub }}

Example of simulating telnet Logon:

Import java. io. inputStream; import java. io. printStream; import org.apache.commons.net. telnet. echoOptionHandler; import org.apache.commons.net. telnet. suppressGAOptionHandler; import org.apache.commons.net. telnet. telnetClient; import org.apache.commons.net. telnet. terminalTypeOptionHandler;/*** use the apache commons-net package to simulate telnet logon */public class TestTelnet {private TelnetClient telnet = null; private InputStream in; private PrintStream out; private char prompt = '#'; // linux prompt/*** log on to linux * @ param server * @ param user * @ param password */public TestTelnet (String server, string user, String password) {try {// Connect to the specified server telnet = new TelnetClient (); TerminalTypeOptionHandler ttopt = new TerminalTypeOptionHandler ("VT100", false, false, true, false); EchoOptionHandler echoopt = new EchoOptionHandler (true, false, true, false); SuppressGAOptionHandler gaopt = new SuppressGAOptionHandler (true, true); telnet. addOptionHandler (ttopt); telnet. addOptionHandler (echoopt); telnet. addOptionHandler (gaopt); telnet. connect (server, 23); // Get input and output stream references in = telnet. getInputStream (); out = new PrintStream (telnet. getOutputStream (); // Log the user on readUntil ("login:"); write (user); readUntil ("Password:"); write (password ); // Advance to a prompt readUntil ("$" + ""); // readUntil ("$" + "su = root "); // write ("su-root");} catch (Exception e) {e. printStackTrace ();}} /*** change the current logon user * @ param user Username * @ param password * @ param serTile linux user prompt * @ return */public String suUser (String user, String password, string userTitle) {// System. out. println ("Change current user:"); write ("su-" + user); // System. out. println ("prepare to read the returned stream to see if you can continue to enter the password:"); readUntil ("Password:"); // it may not be Chinese, use the telnet command to test // System. out. println ("the returned information prompts you to enter the password before starting to record the password:"); write (password); return readUntil (userTitle + "");} /*** read stream information ** @ param pattern the ending character when the stream is read * @ return */public String readUntil (String pattern) {try {char lastChar = pattern. charAt (pattern. length ()-1); // System. out. println ("current stream Character Set:" + new // InputStreamReader (in ). getEncoding (); StringBuffer sb = new StringBuffer (); byte [] buff = new byte [1024]; int ret_read = 0; String str = ""; do {ret_read = in. read (buff); if (ret_read> 0) {// transcode the characters in the read stream, you can use echo $ LANG on the linux host to view what encoding the System is String v = new String (buff, 0, ret_read, "UTF-8"); str = str + v; // System. out. println ("debug:" + str + "======" + pattern); if (str. endsWith (pattern) {// System. out. println ("Exit:" + str + "======" + pattern); break ;}} while (ret_read >= 0); return str ;} catch (Exception e) {e. printStackTrace ();} return null;}/*** sends a message to the stream * @ param value */public void write (String value) {try {out. println (value); out. flush (); System. out. println ("input command:" + value);} catch (Exception e) {e. printStackTrace () ;}}/*** run the command. The default linux prompt is '$' * @ param command * @ return */public String sendCommand (String command) {try {prompt = '$'; write (command); return readUntil (prompt + "") ;}catch (Exception e) {e. printStackTrace ();} return null;}/*** run the command, the default linux prompt is '$' * @ param command * @ param userTitle linux prompt * @ return */public String sendCommand (String command, char userTitle) {try {prompt = userTitle; write (command); return readUntil (prompt + "");} catch (Exception e) {e. printStackTrace ();} return null;}/*** release connection */public void disconnect () {try {telnet. disconnect ();} catch (Exception e) {e. printStackTrace () ;}/ *** @ param args */public static void main (String [] args) {try {TestTelnet telnet = new TestTelnet ("192.168.0.1 ", "zhsoft", "rootroot"); // use -- color = no to block the ls command color. Otherwise, garbled String reStr = telnet. sendCommand ("ls -- color = no"); System. out. println (reStr. replaceFirst ("ls -- color = no", ""); telnet. suUser ("root", "rootroot", "#"); String reStr2 = telnet. sendCommand ("ls -- color = no", '#'); System. out. println (reStr2.replaceFirst ("ls -- color = no", ""); telnet. disconnect ();} catch (Exception e) {e. printStackTrace ();}}}