[英]why does ByteArrayInputStream doesn't return expected results?
I am trying to interact with an application in windows server through telnet, so I am using TelnetClient() method. 我正在尝试通过telnet与Windows服务器中的应用程序进行交互,因此我正在使用TelnetClient()方法。 I could interact (send commands and retrieve results) using System.in.read(), however I want this program to run automatically without using any keyboard inputs. 我可以使用System.in.read()进行交互(发送命令并检索结果),但是我希望该程序自动运行而不使用任何键盘输入。 So, my question is, why does System.in.read() works, yet ByteArrayInputStream doesn't? 所以,我的问题是,为什么System.in.read()可以工作,而ByteArrayInputStream却不能呢?
This is my code so far : 到目前为止,这是我的代码:
public class telnetExample2 implements Runnable, TelnetNotificationHandler{
static TelnetClient tc = null;
public static void main (String args[]) throws IOException, InterruptedException{
tc = new TelnetClient();
while (true){
try{
tc.connect("192.168.1.13", 8999);
}
catch (SocketException ex){
Logger.getLogger(telnetExample2.class.getName()).log(Level.SEVERE, null,ex);
}
Thread reader = new Thread(new telnetExample2());
tc.registerNotifHandler(new telnetExample2());
String command = "getversion"; //this is the command i would like to write
OutputStream os = tc.getOutputStream();
InputStream is = new ByteArrayInputStream(command.getBytes("UTF-8")); //i'm using UTF-8 charset encoding here
byte[] buff = new byte[1024];
int ret_read = 0;
do{
ret_read = is.read(buff);
os.write(buff, 0, 10)
os.flush();
while(ret_read>=0);
}
}
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(nuff, 0, ret_read));
}
while(ret_read>=0);}
catch(Exception e){
System.err.println("Exception while reading socket:" + e.getMessage());
}
}
public void receiveNegotiation(int i, int ii){
throw new UnsupportedOperationException("Not supported");
}
}
InputStream is = new ByteArrayInputStream(command.getBytes("UTF-8")); //i'm using UTF-8 charset encoding here
byte[] buff = new byte[1024];
int ret_read = 0;
do{
ret_read = is.read(buff);
os.write(buff, 0, 10)
os.flush();
while(ret_read>=0);
}
You can reduce those 9 lines that don't work to os.write(command.getBytes("UTF-8"));
您可以将这9条无效的行减少为os.write(command.getBytes("UTF-8"));
which does. 哪个。
Why you thought that reading up to 1024 bytes into a buffer and then writing out only the first ten of them was ever going to work is a mystery. 为什么您认为将多达1024个字节读入缓冲区,然后只写出前十个就行了,这是一个谜。
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