看着：
我想发送一个CHAR LF，十进制值10，还有一个Chr 1，十进制字节值49.再次跟随一个LF。 （我认为这是rainmaker.wunderground.com 3000期望的telnet服务器的序列。）这是从标准输入捕获的键盘输入。我明确没有使用Apache IOUtil example。
必须根据an example WeatherTelnet program对Apache TelnetClient进行读/写操作。它需要一个字节参数的TelnetClient.sendCommand() API specifies，我认为我正在发送。但这是正确的字节吗？并正确发送？
telnet天气服务器预期的第一个命令（见下文）是按Enter键，我将其作为LF，我将其视为Byte by = 10。
它似乎像其他命令一样，就像整数一样，被发送为命令，至少就我所知。任何帮助解释此输出并调试它将不胜感激：
执行JAR：
thufir@dur:~$
thufir@dur:~$ java -jar NetBeansProjects/SSCCE/dist/SSCCE.jar
print..
------------------------------------------------------------------------------
* 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:1
sent 49 cmd 1
Not a valid option. Type a number 1 to 12.
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:1
sent 49 cmd 1
Not a valid option. Type a number 1 to 12.
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:^Cthufir@dur:~$
thufir@dur:~$
thufir@dur:~$
thufir@dur:~$
代码：
package weathertelnet;
import java.io.BufferedReader;
import static java.lang.System.out;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.SocketException;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.logging.Logger;
import org.apache.commons.net.telnet.TelnetClient;
public final class Telnet {
private final static Logger LOG = Logger.getLogger(Telnet.class.getName());
private TelnetClient telnetClient = new TelnetClient();
public Telnet() throws SocketException, IOException {
InetAddress host = InetAddress.getByName("rainmaker.wunderground.com");
int port = 3000;
telnetClient.connect(host, port);
final InputStream inputStream = telnetClient.getInputStream();
final ConcurrentLinkedQueue<Character> clq = new ConcurrentLinkedQueue();
final StringBuilder sb = new StringBuilder();
Thread print = new Thread() {
@Override
public void run() {
out.println("print..");
try {
char ch = (char) inputStream.read();
while (255 > ch && ch >= 0) {
clq.add(ch);
out.print(ch);
ch = (char) inputStream.read();
}
} catch (IOException ex) {
out.println("cannot read inputStream:\t" + ex);
}
}
};
Thread read = new Thread() {
@Override
public void run() {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
try {
do {
String command = in.readLine();
byte[] bytes = command.getBytes();
byte b = 0;
for (int i = 0; i < bytes.length; i++) {
b = bytes[i];
String cmd = new String(bytes);
telnetClient.sendCommand(b);
out.println("sent\t" + b + "\tcmd\t" + cmd);
}
b=10;
telnetClient.sendCommand(b);
} while (true);
} catch (IOException ex) {
}
}
};
print.start();
read.start();
}
public static void main(String[] args) throws SocketException, IOException {
new Telnet();
}
}
常规电话
net:
thufir@dur:~$
thufir@dur:~$
thufir@dur:~$ telnet rainmaker.wunderground.com 3000
Trying 38.102.137.140...
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:1
CITY FORECAST MENU
---------------------------------------------------
1) Print forecast for selected city
2) Print climatic data for selected city
3) Display 3-letter city codes for a selected state
4) Display all 2-letter state codes
M) Return to main menu
X) Exit program
?) Help
Selection:x
Connection closed by foreign host.
thufir@dur:~$
thufir@dur:~$
答案 0 :(得分：1)
package sscce;
import java.io.BufferedReader;
import java.io.OutputStream;
import static java.lang.System.out;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.SocketException;
import java.util.logging.Logger;
import org.apache.commons.net.telnet.TelnetClient;
public final class Telnet {
private final static Logger LOG = Logger.getLogger(Telnet.class.getName());
private TelnetClient telnetClient = new TelnetClient();
public Telnet() throws SocketException, IOException {
InetAddress host = InetAddress.getByName("rainmaker.wunderground.com");
int port = 3000;
telnetClient.connect(host, port);
final InputStream inputStream = telnetClient.getInputStream();
final OutputStream outputStream = telnetClient.getOutputStream();
Thread print = new Thread() {
@Override
public void run() {
out.println("print..");
try {
char ch = (char) inputStream.read();
while (255 > ch && ch >= 0) {
out.print(ch);
ch = (char) inputStream.read();
}
} catch (IOException ex) {
out.println("cannot read inputStream:\t" + ex);
}
}
};
Thread read = new Thread() {
@Override
public void run() {
BufferedReader bufferedInput = new BufferedReader(new InputStreamReader(System.in));
try {
do {
byte b = 10;
outputStream.write(10);
outputStream.flush();
String command = bufferedInput.readLine();
byte[] bytes = command.getBytes();
outputStream.write(bytes);
outputStream.flush();
} while (true);
} catch (IOException ex) {
}
}
};
print.start();
read.start();
}
public static void main(String[] args) throws SocketException, IOException {
new Telnet();
}
}