java - Apache TelnetClient, InputStream unable to convert to String using Apache IOUtils -

i'm having trouble inputstream telnet session. have made connection, can send commands via telnet and, using system.out.println, can see receiving correct response.

i needed return responses session, string, need perform regex on verify value test.

import java.io.bufferedreader; import java.io.ioexception; import java.io.inputstream; import java.io.inputstreamreader; import java.io.printstream; import java.io.reader; import java.io.stringwriter; import java.io.writer; import java.net.socketexception;  import org.apache.commons.io.ioutils; import org.apache.commons.net.telnet.telnetclient;  public class telnetservice {  private final string server; private final int port; private telnetclient telnet = new telnetclient(); private inputstream datain; private printstream dataout; private string prompt = "~$";  public telnetservice(string server, int port) {     this.server = server.replace("http://", "");     this.port = port; }      private void starttelnetsession() throws socketexception, ioexception {     telnet.connect(server, port);     datain = telnet.getinputstream();     dataout = new printstream(telnet.getoutputstream()); }  public string gettelnetsessionasstring() {     try {         starttelnetsession();         loginuser();         readuntil(prompt);         write("this_command");         readuntil(prompt);         stringwriter writer = new stringwriter();         ioutils.copy(datain, writer, "utf-8");         dataout.flush();         datain.close();         dataout.close();         string received = writer.tostring();         telnet.disconnect();         return received;     } catch (exception e) {         e.printstacktrace();     }     return null; }  private void loginuser() {     readuntil("login:");     write("foo");     readuntil("password:");     write("bar"); }    private void write(string value) {     try {         dataout.println(value);         dataout.flush();         system.out.println(value);     } catch (exception e) {         e.printstacktrace();     }  }  private string readuntil(string pattern) {     try {         char lastchar = pattern.charat(pattern.length() - 1);         stringbuffer buffer = new stringbuffer();         char ch = (char) datain.read();         while (true) {             system.out.print(ch);             buffer.append(ch);             if (ch == lastchar) {                 if (buffer.tostring().endswith(pattern)) {                     return buffer.tostring();                 }             }             ch = (char) datain.read();         }     } catch (exception e) {         e.printstacktrace();     }     return null; } } 

as is, whenever test runs calls class, appears 'hang' during the

ioutils.copy(datain, writer, "utf-8"); 

i'm sure there simple i'm missing. out there able help? appreciated!

as happens able solve issue - not how wished suitable enough simple test function.

i wrote telnet inputstream file rather system.out.print'ed it. allowed me read file string.

i'd still liked have solved issue - guess threading issue , i'm still never beginner haven't tackled that.