Java如何按16进制发送和接收TCP指令

import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import org.apache.http.util.TextUtils;
public class TCPSocket{
	public static void main(String args[]){
		String cmdInfor="00 00 00 00 00 06 01 01 00 01 00 20";
		send(cmdInfor);
	}
	public static String send(String cmdInfor){ 
		String strReturn = null;
		try {  
			//要连接的服务端IP地址  
			String host = "192.168.1.2"; 
			//要连接的服务端对应的监听端口  
			int port = 502;   
			//将十六进制的字符串转换成字节数组
			byte[] cmdInfor2 = hexStrToBinaryStr(cmdInfor);
			//1.建立客户端socket连接，指定服务器位置及端口  
			Socket clientSocket =new Socket(host,port);  
			//2.得到socket读写流  
			OutputStream os=clientSocket.getOutputStream();  
			PrintWriter pw=new PrintWriter(os);  
			//输入流  
			InputStream is=clientSocket.getInputStream();  
			//3.利用流按照一定的操作，对socket进行读写操作  
			os.write(cmdInfor2);  
			os.flush();  
			clientSocket.shutdownOutput();  
			//接收服务器的响应 
            		int line = 0; 
			byte[] buf = new byte[is.available()];
			 //接收收到的数据
           		 while((line=is.read(buf))!=-1){
	           	        //将字节数组转换成十六进制的字符串
	            		strReturn= BinaryToHexString(buf);
           		 }
			//4.关闭资源  
			is.close();  
			pw.close();  
			os.close();  
			clientSocket.close();
		}catch (Exception e){
			e.printStackTrace();
		}
		return strReturn;
	}  
	/**
	 * 将十六进制的字符串转换成字节数组
	 *
	 * @param hexString
	 * @return
	 */
	public static byte[] hexStrToBinaryStr(String hexString) {
		if (TextUtils.isEmpty(hexString)) {
			return null;
		}
		hexString = hexString.replaceAll(" ", "");
		int len = hexString.length();
		int index = 0;
		byte[] bytes = new byte[len / 2];
		while (index < len) {
			String sub = hexString.substring(index, index + 2);
			bytes[index/2] = (byte)Integer.parseInt(sub,16);
			index += 2;
		}
		return bytes;
	}
	/**
	 * 将字节数组转换成十六进制的字符串
	 *
	 * @return
	 */
	public static String BinaryToHexString(byte[] bytes) {
	    String hexStr = "0123456789ABCDEF";
	    String result = "";
	    String hex = "";
	    for (byte b : bytes) {
	        hex = String.valueOf(hexStr.charAt((b & 0xF0) >> 4));
	        hex += String.valueOf(hexStr.charAt(b & 0x0F));
	        result += hex + " ";
	    }
	    return result;
	}
}

import java.io.IOException;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
public class TCPTest01 {
    public static void main(String[] args) throws IOException {
        Socket s = new Socket(InetAddress.getByName("uos-pc"), 10086);
        OutputStream os = s.getOutputStream();
        os.write("FTP".getBytes());
        s.close();
    }
}

import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class TCPTest02 {
    public static void main(String[] args) throws IOException {
        ServerSocket ss = new ServerSocket(10086);
        Socket s = ss.accept();
        InputStream is = s.getInputStream();
        byte[] b = new byte[1024];
        int len = is.read(b);
        String data = new String(b, 0, len);
        System.out.println(data);
        s.close();
        ss.close();
    }
}