java InputStream转byte[]，byte[]转16进制字符串 ，16进制字符串转acsii码字符串

//接收1：将InputStream先转为byte【】，
public static final byte[] input2byte(InputStream inStream)  
        throws IOException {  
    ByteArrayOutputStream swapStream = new ByteArrayOutputStream();  
    byte[] buff = new byte[100];  
    int rc = 0;  
    while ((rc = inStream.read(buff, 0, 100)) > 0) {  
        swapStream.write(buff, 0, rc);  
    }  
    byte[] in2b = swapStream.toByteArray();  
    return in2b;  
}  

//接收2：将byte【】转为16进制
public static String bytesToHexString(byte[] src) {
	StringBuffer sb = new StringBuffer("");
	if (src == null || src.length <= 0) {
	return null;
	}
	for (int i = 0; i < src.length; i++) {
	int v = src[i] & 0xFF;
	String hv = Integer.toHexString(v).toUpperCase();
	if (hv.length() < 2) {
	sb.append(0);
	}
	sb.append(hv);
	if (i != src.length - 1) {
	sb.append(" ");
	}
	}
	return sb.toString();
	}



//解析：将16进制的字符串 hex转ascii字符串
public static String hexStr2Str(String hexStr) {
		String str = "0123456789ABCDEF";
		char[] hexs = hexStr.toCharArray();
		byte[] bytes = new byte[hexStr.length() / 2];
		int n;
		for (int i = 0; i < bytes.length; i++) {
			n = str.indexOf(hexs[2 * i]) * 16;
			n += str.indexOf(hexs[2 * i + 1]);
			bytes[i] = (byte) (n & 0xff);
		}
		return new String(bytes);
	}


//将hex string 转为byte  客户端经过TCP会收到和hexstring  同样的16进制
	private static byte[] hexStringToHex(String str) 
	{
		 byte[] result = new byte[18]; 
		String tempString="";
		 String[] ss = str.split(" ");
		 for (int i = 0;i < ss.length;i++){
			 
			 result[i]= (byte) Integer.parseInt(ss[i], 16);
			  // System.out.println(ss[i]);
	        }
		
		  System.out.println(Arrays.toString(result));  
		 return result;
	}