问题
context: there are distinctions between different telnet clients, and certainly a distinction from those clients to, for example, the Apache library. In this case, yes, using an actual telnet client for MUD's, where the servers can be quite finnicky, so that API's or sockets just won't work.
How do I go about:
Spawn a new Process for every piped command.
Create Threads that read the output from one command and write it to the input of the next command.
right now there's no output for:
package mud;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.logging.Logger;
public class App {
private final static Logger log = Logger.getLogger(App.class.getName());
private void telnet() throws IOException {
String s = "rainmaker.wunderground.com";
List<String> telnetCommand = Arrays.asList("sh", "-c", "rainmaker.wunderground.com | tee -a -i telnet.log");
String foo = "foo";
ProcessBuilder pb = new ProcessBuilder(telnetCommand);
Process p = pb.start();
}
public static void main(String[] args) throws IOException {
new App().telnet();
}
}
so first I need to capture the result (the log file):
thufir@dur:~/NetBeansProjects/mud$
thufir@dur:~/NetBeansProjects/mud$ ll
total 96
drwxrwxr-x 7 thufir thufir 4096 May 3 21:00 ./
drwxrwxr-x 3 thufir thufir 4096 May 3 19:24 ../
drwxrwxr-x 5 thufir thufir 4096 May 3 20:50 build/
-rw-rw-r-- 1 thufir thufir 1034 May 3 19:20 build.gradle
drwxrwxr-x 8 thufir thufir 4096 May 3 21:00 .git/
-rw-rw-r-- 1 thufir thufir 154 May 3 19:20 .gitattributes
-rw-rw-r-- 1 thufir thufir 382 May 3 19:20 .gitignore
drwxrwxr-x 8 thufir thufir 4096 May 3 19:24 .gradle/
drwxrwxr-x 3 thufir thufir 4096 May 3 19:20 gradle/
-rwxrwxr-x 1 thufir thufir 5764 May 3 19:20 gradlew*
-rw-rw-r-- 1 thufir thufir 3056 May 3 19:20 gradlew.bat
-rw-rw-r-- 1 thufir thufir 35149 May 3 19:20 LICENSE
-rw-rw-r-- 1 thufir thufir 34 May 3 19:20 README.md
-rw-rw-r-- 1 thufir thufir 350 May 3 19:20 settings.gradle
drwxrwxr-x 4 thufir thufir 4096 May 3 19:44 src/
thufir@dur:~/NetBeansProjects/mud$
thufir@dur:~/NetBeansProjects/mud$ gradle clean run
BUILD SUCCESSFUL in 948ms
3 actionable tasks: 3 executed
thufir@dur:~/NetBeansProjects/mud$
thufir@dur:~/NetBeansProjects/mud$ ll
total 96
drwxrwxr-x 7 thufir thufir 4096 May 3 21:00 ./
drwxrwxr-x 3 thufir thufir 4096 May 3 19:24 ../
drwxrwxr-x 5 thufir thufir 4096 May 3 21:00 build/
-rw-rw-r-- 1 thufir thufir 1034 May 3 19:20 build.gradle
drwxrwxr-x 8 thufir thufir 4096 May 3 21:00 .git/
-rw-rw-r-- 1 thufir thufir 154 May 3 19:20 .gitattributes
-rw-rw-r-- 1 thufir thufir 382 May 3 19:20 .gitignore
drwxrwxr-x 8 thufir thufir 4096 May 3 19:24 .gradle/
drwxrwxr-x 3 thufir thufir 4096 May 3 19:20 gradle/
-rwxrwxr-x 1 thufir thufir 5764 May 3 19:20 gradlew*
-rw-rw-r-- 1 thufir thufir 3056 May 3 19:20 gradlew.bat
-rw-rw-r-- 1 thufir thufir 35149 May 3 19:20 LICENSE
-rw-rw-r-- 1 thufir thufir 34 May 3 19:20 README.md
-rw-rw-r-- 1 thufir thufir 350 May 3 19:20 settings.gradle
drwxrwxr-x 4 thufir thufir 4096 May 3 19:44 src/
-rw-rw-r-- 1 thufir thufir 0 May 3 21:00 telnet.log
thufir@dur:~/NetBeansProjects/mud$
thufir@dur:~/NetBeansProjects/mud$ cat telnet.log
thufir@dur:~/NetBeansProjects/mud$
from the console:
thufir@dur:~$
thufir@dur:~$ telnet rainmaker.wunderground.com | tee -a -i telnet.log
Trying 35.160.169.47...
Connected to rainmaker.wunderground.com.
Escape character is '^]'.
------------------------------------------------------------------------------
* Welcome to THE WEATHER UNDERGROUND telnet service! *
------------------------------------------------------------------------------
* *
* National Weather Service information provided by Alden Electronics, Inc. *
* and updated each minute as reports come in over our data feed. *
* *
* **Note: If you cannot get past this opening screen, you must use a *
* different version of the "telnet" program--some of the ones for IBM *
* compatible PC's have a bug that prevents proper connection. *
* *
* comments: jmasters@wunderground.com *
------------------------------------------------------------------------------
Press Return to continue:
Press Return for menu
or enter 3 letter forecast city code--
WEATHER UNDERGROUND MAIN MENU
******************************
1) U.S. forecasts and climate data
2) Canadian forecasts
3) Current weather observations
4) Ski conditions
5) Long-range forecasts
6) Latest earthquake reports
7) Severe weather
8) Hurricane advisories
9) Weather summary for the past month
10) International data
11) Marine forecasts and observations
12) Ultraviolet light forecast
X) Exit program
C) Change scrolling to screen
H) Help and information for new users
?) Answers to all your questions
Selection:x
Connection closed by foreign host.
thufir@dur:~$
thufir@dur:~$ cat telnet.log
Trying 127.0.0.1...
Trying 35.160.169.47...
Connected to rainmaker.wunderground.com.
Escape character is '^]'.
------------------------------------------------------------------------------
* Welcome to THE WEATHER UNDERGROUND telnet service! *
------------------------------------------------------------------------------
* *
* National Weather Service information provided by Alden Electronics, Inc. *
* and updated each minute as reports come in over our data feed. *
* *
* **Note: If you cannot get past this opening screen, you must use a *
* different version of the "telnet" program--some of the ones for IBM *
* compatible PC's have a bug that prevents proper connection. *
* *
* comments: jmasters@wunderground.com *
------------------------------------------------------------------------------
Press Return to continue:
Press Return for menu
or enter 3 letter forecast city code--
WEATHER UNDERGROUND MAIN MENU
******************************
1) U.S. forecasts and climate data
2) Canadian forecasts
3) Current weather observations
4) Ski conditions
5) Long-range forecasts
6) Latest earthquake reports
7) Severe weather
8) Hurricane advisories
9) Weather summary for the past month
10) International data
11) Marine forecasts and observations
12) Ultraviolet light forecast
X) Exit program
C) Change scrolling to screen
H) Help and information for new users
?) Answers to all your questions
Selection:thufir@dur:~$
thufir@dur:~$
perhaps somehow create a delay while waiting for a response rather than just running the command and exiting?
来源：https://stackoverflow.com/questions/61584982/how-to-use-threads-and-tee-to-log-the-telnet-response-from-a-server