这里给大家推荐个网站，上面有各网络协议的中文版本，比如下面是Telnet协议和Socks V5协议

TELNET: http://www.cnpaf.net/rfc/rfc854.txt

SOCKS V5: http://www.cnpaf.net/rfc/rfc1928.txt

以下代码来自（http://shenxueliang.iteye.com/blog/1184553）

package telnet; import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.Socket;import java.util.ArrayList;import java.util.List;  /** * Telnet简单实现 *  * @author xueliang 2010.11.6 *  */public class Telnet {	private static final byte SB = (byte) 250;// 子选项开始	private static final byte SE = (byte) 240;// 子选项结束	private static final byte WILL = (byte) 251;// 选项协商	private static final byte WONT = (byte) 252;// 选项协商	private static final byte DO = (byte) 253;// 选项协商	private static final byte DONT = (byte) 254;// 选项协商	private static final byte IAC = (byte) 255;// 数据字节255	private static final byte ECHO = (byte) 1;// 回显	private static final byte IS = (byte) 0;// 是	private static final byte SUPPRESS = (byte) 3;// 抑制继续进行	private static final byte TT = (byte) 24;// 终端类型	private InputStream is;	private OutputStream os;	private Socket client;	private byte[] readBuffer = new byte[1024]; 	/**	 * 打开telnet连接	 * @param ip	 * @param port 23	 * @return	 * @throws CmdException 	 */	public Telnet(String ip){		this(ip, 23);	} 	/**	 * 打开telnet连接	 * @param ip	 * @param port	 * @return	 * @throws CmdException 	 */	public Telnet(String ip, int port){		try {			client = new Socket(ip, port);			client.setSoTimeout(5000);//设置is的read方法阻塞时间为5秒			is = client.getInputStream();			os = client.getOutputStream();		} catch (Exception e) {			this.close();		} 	}	/**	 * 读取回显，并进行telnet协商	 * @return	 * @throws IOException	 */	public String recieveEcho() throws IOException {		int len = is.read(this.readBuffer);		if(is.available() == 0)			return "";		ArrayList
    
      bsList = new ArrayList
     
      ();		ArrayList
      
        cmdList = new ArrayList
       
        ();		for (int i = 0; i < len; i++) {			int b = this.readBuffer[i] & 0xff;//&0xff是为了防止byte的255溢出,java中byte的取值是-128~127			if (b != 255) {//没有协商要求				if (b == '\n' || b == '\0') {// NVT中行结束符以'\r\n'表示，回车以'\r\0表示'					continue;				}				bsList.add((byte) b);				continue;			}			cmdList.add(IAC); 			switch (this.readBuffer[++i] & 0xff) {			case 251:// 服务器想激活某选项				if ((readBuffer[++i] & 0xff) == 1) {// 同意回显					cmdList.add(DO);					cmdList.add(ECHO);				} else if ((readBuffer[i] & 0xff) == 3) {// 同意抑制继续执行					cmdList.add(DO);					cmdList.add(SUPPRESS);					// cmdList.add(GA);				} else {// 不同意其他类型协商					cmdList.add(DONT);					cmdList.add(readBuffer[i]);				}				break;			case 253:// 服务器想让客户端发起激活某选项				if ((readBuffer[++i] & 0xff) == 24) {// 终端类型					cmdList.add(WONT);// 同意激活终端类型协商					cmdList.add(TT);				} else if ((readBuffer[i] & 0xff) == 1) {					cmdList.add(WILL);					cmdList.add(ECHO);				} else {					cmdList.add(WONT);// 不同意其他类型协商					cmdList.add(readBuffer[i]);				}				break;			case 250:// 子选项开始				cmdList.add(SB);				if ((readBuffer[++i] & 0xff) == 24						&& (readBuffer[++i] & 0xff) == 1) {// 发送你的终端类型					cmdList.add(TT);					cmdList.add(IS);// 我的终端类型是					cmdList.add((byte) 'V');					cmdList.add((byte) 'T');					cmdList.add((byte) '1');					cmdList.add((byte) '0');					cmdList.add((byte) '0');				}				break;			case 240:// 子选项结束				cmdList.add(SE);				break;			case 252:// 必须同意				cmdList.add(DONT);				cmdList.add(readBuffer[++i]);				break;			case 254:// 必须同意				cmdList.add(WONT);				cmdList.add(readBuffer[++i]);				break;			}		}		// 如果有协商则向服务端发送协商选项		if (cmdList.size() > 0) {			byte[] writeBuffer = new byte[cmdList.size()];			for (int i = 0; i < cmdList.size(); i++) {				writeBuffer[i] = cmdList.get(i);			}			os.write(writeBuffer);		}		// 组织回显字符		int size = bsList.size();		String str = "";		if (size > 0) {			byte[] bs = new byte[size];			for (int i = 0; i < size; i++) {				bs[i] = bsList.get(i).byteValue();			}			str = new String(bs, "gbk");		}		// 以下测试时打开		// System.out.print("read===== ");		// for (int i = 0; i < len; i++) {		// System.out.print(readBuffer[i]&0xff);		// System.out.print(" ");		// }		// System.out.println();		// if(cmdList.size()>0){		// System.out.print("write==== ");		// for (int i = 0; i < cmdList.size(); i++) {		// System.out.print(cmdList.get(i) & 0xff);		// System.out.print(" ");		// }		// System.out.println();		// }		return str;	} 	/**	 * 直接发送命令，不发送回车键	 * @param cmd	 */	public void sendWithoutCR(String cmd) {		try {			os.write(cmd.getBytes());		} catch (IOException e) {			e.printStackTrace();		}	}		/**	 * 命令中不要包括回车、换行	 * @param cmd	 */	public void sendCmd(String cmd) {		cmd += "\r\0";		try {			os.write(cmd.getBytes());		} catch (IOException e) {			e.printStackTrace();		}	} 	/**	 * 按字节发送命令，数组中不要包括回车、换行	 * @param cmd	 */	public void sendCmd(List
        
          cmdList) {		if(cmdList == null)return;		int size = cmdList.size();		byte[] send = null;		if(cmdList.get(size-1) == '\r'){			send = new byte[size+1];			send[size] = '\0';		}else{			send = new byte[size];		}		for (int i = 0; i < size; i++) {			send[i] = cmdList.get(i);		}		try {			os.write(send);		} catch (IOException e) {			e.printStackTrace();		}	} 	/**	 * 关闭telnet连接	 */	public void close() {		if (is != null) {			try {				is.close();			} catch (IOException e) {				e.printStackTrace();			}		}		if (os != null) {			try {				os.close();			} catch (IOException e) {				e.printStackTrace();			}		}		if (client != null) {			try {				client.close();			} catch (IOException e) {				e.printStackTrace();			}		}	}		/**	 * 读取期望值，使用默认超时时间15秒	 * @param keyWords	 * @return	 */	public String readKeyWords(String... keyWords){		return this.readKeyWords(15000, keyWords);	}	/**	 * 读取期望值	 * @param timeOut 超时时间	 * @param keyWords	 * @return	 * @throws CmdException 	 */	public String readKeyWords(long timeOut,String... keyWords){		String rv = "";		long nextTime = 0;		long endTime = System.currentTimeMillis() + timeOut;		do {			try{				String _rv = this.recieveEcho();				rv += _rv;			}catch(IOException e){				nextTime = endTime - System.currentTimeMillis() ;			}		} while (!this.findKeyWord(keyWords, rv) && nextTime >= 0);		if(nextTime < 0)			System.err.println("Read TimeOut...Echo:\n"+rv);		return rv;	}		/**	 * 查找关键字	 * @param keyWords	 * @param str	 * @return	 */	private boolean findKeyWord(String[] keyWords,String str){		if(keyWords == null || str == null)return false;		for (int i = 0; i < keyWords.length; i++) {			if(str.indexOf(keyWords[i]) != -1)				return true;		}		return false;	}	public static void main(String[] args) {		Telnet telnet = new Telnet("10.110.111.193");		String str = telnet.readKeyWords(":");		System.out.println(str);		telnet.sendCmd("boco");		str = telnet.readKeyWords(":");		telnet.sendCmd("Ab123456");		str = telnet.readKeyWords("$");		System.out.println(str);		telnet.sendCmd("ls");		str = telnet.readKeyWords(10000,"$");		System.out.println(str);		telnet.close();	}}