从java swing的窗口中发送来自Apache的Telnet客户端的用户名和密码。它正确连接。只有当您输入用户名和密码时才会出现问题。在控制台中，它可以工作（如果你在控制台中写）。但是，如果你传出窗口java swing，用户名将被记录在控制台中，但在按Enter键之前不会运行命令。这是代码
package zapas;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.FileOutputStream;
import java.util.StringTokenizer;
import org.apache.commons.net.telnet.TelnetClient;
import org.apache.commons.net.telnet.TelnetNotificationHandler;
import org.apache.commons.net.telnet.SimpleOptionHandler;
import org.apache.commons.net.telnet.EchoOptionHandler;
import org.apache.commons.net.telnet.TerminalTypeOptionHandler;
import org.apache.commons.net.telnet.SuppressGAOptionHandler;
import org.apache.commons.net.telnet.InvalidTelnetOptionException;
/***
* This is a simple example of use of TelnetClient.
* An external option handler (SimpleTelnetOptionHandler) is used.
* Initial configuration requested by TelnetClient will be:
* WILL ECHO, WILL SUPPRESS-GA, DO SUPPRESS-GA.
* VT100 terminal type will be subnegotiated.
* <p>
* Also, use of the sendAYT(), getLocalOptionState(), getRemoteOptionState()
* is demonstrated.
* When connected, type AYT to send an AYT command to the server and see
* the result.
* Type OPT to see a report of the state of the first 25 options.
* <p>
* @author Bruno D'Avanzo
***/
public class TelnetClientExample implements Runnable, TelnetNotificationHandler{
static TelnetClient tc = null;
public void TelnetClientExample(String[] args) throws Exception{
args = new String[2];
args[0] = "172.16.20.1";
args[1] = "23";
FileOutputStream fout = null;
if(args.length < 1){
System.err.println("Usage: TelnetClientExample1 <remote-ip> [<remote-port>]");
System.exit(1);
}
String remoteip = args[0];
int remoteport;
if (args.length > 1){
remoteport = (new Integer(args[1])).intValue();
}else{
remoteport = 23;
}
try{
fout = new FileOutputStream ("spy.log", true);
}catch (IOException e){
System.err.println(
"Exception while opening the spy file: "
+ e.getMessage());
}
tc = 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, true, true);
try{
tc.addOptionHandler(ttopt);
tc.addOptionHandler(echoopt);
tc.addOptionHandler(gaopt);
}catch (InvalidTelnetOptionException e){
System.err.println("Error registering option handlers: " + e.getMessage());
}
while (true){
boolean end_loop = false;
try{
tc.connect(remoteip, remoteport);
System.out.println("!!! My Conect");
Thread reader = new Thread (new TelnetClientExample());
tc.registerNotifHandler(new TelnetClientExample());
System.out.println("TelnetClientExample");
System.out.println("Type AYT to send an AYT telnet command");
System.out.println("Type OPT to print a report of status of options (0-24)");
System.out.println("Type REGISTER to register a new SimpleOptionHandler");
System.out.println("Type UNREGISTER to unregister an OptionHandler");
System.out.println("Type SPY to register the spy (connect to port 3333 to spy)");
System.out.println("Type UNSPY to stop spying the connection");
reader.start();
OutputStream outstr = tc.getOutputStream();
byte[] buff = new byte[1024];
int ret_read = 0;
do{
try{
ret_read = System.in.read(buff);
if(ret_read > 0){
if((new String(buff, 0, ret_read)).startsWith("AYT")){
try{
System.out.println("!!! My Conect AYT");
System.out.println("Sending AYT");
System.out.println("AYT response:" + tc.sendAYT(5000));
}catch (IOException e){
System.err.println("Exception waiting AYT response: " + e.getMessage());
}
}else if((new String(buff, 0, ret_read)).startsWith("OPT")){
System.out.println("Status of options:");
for(int ii=0; ii<25; ii++) {
System.out.println("Local Option " + ii + ":" + tc.getLocalOptionState(ii) + " Remote Option " + ii + ":" + tc.getRemoteOptionState(ii));
}
}else if((new String(buff, 0, ret_read)).startsWith("REGISTER")){
StringTokenizer st = new StringTokenizer(new String(buff));
System.out.println("!!! My Conect REGISTER");
try{
System.out.println("!!! My Conect REGISTER");
st.nextToken();
int opcode = Integer.parseInt(st.nextToken());
boolean initlocal = Boolean.parseBoolean(st.nextToken());
boolean initremote = Boolean.parseBoolean(st.nextToken());
boolean acceptlocal = Boolean.parseBoolean(st.nextToken());
boolean acceptremote = Boolean.parseBoolean(st.nextToken());
SimpleOptionHandler opthand = new SimpleOptionHandler(opcode, initlocal, initremote,
acceptlocal, acceptremote);
tc.addOptionHandler(opthand);
}catch (NumberFormatException | InvalidTelnetOptionException | IOException e){
if(e instanceof InvalidTelnetOptionException){
System.err.println("Error registering option: " + e.getMessage());
}else{
System.err.println("Invalid REGISTER command.");
System.err.println("Use REGISTER optcode initlocal initremote acceptlocal acceptremote");
System.err.println("(optcode is an integer.)");
System.err.println("(initlocal, initremote, acceptlocal, acceptremote are boolean)");
}
}
}else if((new String(buff, 0, ret_read)).startsWith("UNREGISTER")){
StringTokenizer st = new StringTokenizer(new String(buff));
System.out.println("!!! My Conect UNREGISTER");
try{
st.nextToken();
int opcode = (new Integer(st.nextToken())).intValue();
tc.deleteOptionHandler(opcode);
}catch (NumberFormatException | InvalidTelnetOptionException | IOException e){
if(e instanceof InvalidTelnetOptionException){
System.err.println("Error unregistering option: " + e.getMessage());
}else{
System.err.println("Invalid UNREGISTER command.");
System.err.println("Use UNREGISTER optcode");
System.err.println("(optcode is an integer)");
}
}
}else if((new String(buff, 0, ret_read)).startsWith("SPY")){
System.out.println("!!! My Conect SPY");
tc.registerSpyStream(fout);
}else if((new String(buff, 0, ret_read)).startsWith("UNSPY")){
System.out.println("!!! My Conect UNSPY");
tc.stopSpyStream();
}else{
System.out.println("!!! My Conect ELSE");
try{
outstr.write(buff, 0 , ret_read);
outstr.flush();
}catch (IOException e){
end_loop = true;
}
}
}
}catch (IOException e){
System.err.println("Exception while reading keyboard:" + e.getMessage());
end_loop = true;
}
}while((ret_read > 0) && (end_loop == false));
try{
System.out.println("!!! My DISCONECT");
tc.disconnect();
}catch (IOException e){
System.err.println("Exception while connecting:" + e.getMessage());
}
}catch (IOException e){
System.err.println("Exception while connecting:" + e.getMessage());
System.exit(1);
}
}
}
/***
* Callback method called when TelnetClient receives an option
* negotiation command.
* <p>
* @param negotiation_code - type of negotiation command received
* (RECEIVED_DO, RECEIVED_DONT, RECEIVED_WILL, RECEIVED_WONT)
* <p>
* @param option_code - code of the option negotiated
* <p>
***/
@Override
public void receivedNegotiation(int negotiation_code, int option_code){
String command = null;
if(negotiation_code == TelnetNotificationHandler.RECEIVED_DO){
command = "DO";
}else if(negotiation_code == TelnetNotificationHandler.RECEIVED_DONT){
command = "DONT";
}else if(negotiation_code == TelnetNotificationHandler.RECEIVED_WILL){
command = "WILL";
}else if(negotiation_code == TelnetNotificationHandler.RECEIVED_WONT){
command = "WONT";
}
System.out.println("Received " + command + " for option code " + option_code);
}
/***
* Reader thread.
* Reads lines from the TelnetClient and echoes them
* on the screen.
***/
@Override
public void run(){
InputStream instr = tc.getInputStream();
try{
byte[] buff = new byte[1024];
int ret_read = 0;
do{
ret_read = instr.read(buff);
if(ret_read > 0){
System.out.print(new String(buff, 0, ret_read));
}
}while (ret_read >= 0);
}catch (IOException e){
System.err.println("Exception while reading socket:" + e.getMessage());
}
try{
tc.disconnect();
}catch (IOException e){
System.err.println("Exception while closing telnet:" + e.getMessage());
}
}
}
所以从java swing窗口发送命令
System.out.print("tiundv");
System.out.write(KeyEvent.VK_ENTER);