linux下运行telnet问题

[gaoxinghans]

用的是apache共享包
这段代码在windows下面可以正常connect远程主机,并且可以执行命令返回结果,disconnect
但是在LinuxCentOS下面测试发现login的时候可以读取到"login:"之后write指令就无响应了

windows下面返回值乱码问题用iso转gbk解决的
Linux默认字符集是zh_CN.UTF-8

import java.io.*;

import org.apache.commons.net.telnet.*;

public class ApacheTelnet {
	public ApacheTelnet() {
		telnet = new TelnetClient("VT220");
		promptText = prompt;
		connetionStatus = false;
	}

	public boolean Connect(String ip, int port, String user, String password) {
		try {
			if (connetionStatus == false) {
				telnet.connect(ip, port);
				in = telnet.getInputStream();
				out = new PrintStream(telnet.getOutputStream());
				login(user, password);
				connetionStatus = true;
				return true;
			} else {
				return false;
			}
		} catch (Exception e) {
			e.printStackTrace();
			return false;
		}
	}

	public void login(String user, String password) {
		readUntil("login:");
		write(user);
		readUntil("password:");
		write(password);
		readUntil(prompt);

	}

	public void write(String value) {
		try {
			out.println(value);
			out.flush();
			Thread.sleep(1000);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public boolean disconnect() {
		try {
			if (connetionStatus == true) {
				telnet.disconnect();
				connetionStatus = false;
				return true;
			} else {
				return false;
			}
		} catch (Exception e) {
			e.printStackTrace();
			return false;
		}
	}

	public String readUntil(String pattern) {
		try {
			StringBuffer sb = new StringBuffer();
			// boolean found = false;
			char ch = (char) in.read();
			sb.append(ch);
			while (sb.toString().endsWith(pattern) != true) {
				ch = (char) in.read();
				sb.append(ch);
			}
			return sb.toString();
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}

	}

	public String sendCommand(String command) {
		try {

			getCurrentDir();
			write(command);
			returnText = readUntil(promptText);
			returnText = isoToGbk(returnText);
			returnText = returnText.substring(command.length() + 2,
					returnText.length() - promptText.length());
			return returnText;

		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	public void getCurrentDir() {
		try {
			write(" ");
			promptText = readUntil(prompt);
			promptText = isoToGbk(promptText);
			promptText = promptText.substring(3, promptText.length());
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public static String isoToGbk(String para) {
		try {
			return new String(para.getBytes("ISO-8859-1"), "GBK");
		} catch (Exception e) {
			return "";
		}
	}

	public static String gbkToIso(String para) {
		try {
			return new String(para.getBytes("GBK"), "ISO-8859-1");
		} catch (Exception e) {
			return "";
		}
	}

	private TelnetClient telnet;
	private InputStream in;
	private PrintStream out;
	private String promptText;
	private String returnText;

	private String prompt = ">";
	private boolean connetionStatus;
}

[gaoxinghans]

getCurrentDir是读取当前路径 windows的结尾字符串是">"但是会出现返回值如果包含">"就会造成读取部分返回值,所以我用当前路径作为判断返回读完,各位有什么更好的方法判断读取完了? Linux下面为什么会没有响应,Debug了一下,第一个readUntil("login:"正常读取,卡在第一个write

[gaoxinghans]

把Linux改成zh_CN.GBK也不行啊

[gaoxinghans]

问题貌似找到,linux下面把write的println改成print("\r\n")就可以正常发送命令,但是有个奇怪,为什么在windows下面反而不行了呢