netty 以16进制字节码和硬件通信
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- 1 核心代码
需要把16进制的字节码数组写入 byteBuf里面再发送给硬件才可以
/**
* 发送数据
*/
private static void send2client(ChannelHandlerContext channel, final String receiveStr) {
try {
// netty需要用ByteBuf传输
ByteBuf buff = Unpooled.buffer();
// 对接需要16进制
buff.writeBytes(ConvertCode.hexString2Bytes(receiveStr));
channel.writeAndFlush(buff);
} catch (Exception e) {
e.printStackTrace();
}
}
- 2.接收数据转换
@Override
protected void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
byte[] bytes = new byte[buf.readableBytes()];
// 复制内容到字节数组bytes
buf.readBytes(bytes);
// 将接收到的数据转为字符串，此字符串就是客户端发送的字符串
String receiveStr = ConvertCode.receiveHexToString(bytes);
System.out.println(receiveStr);
String ipString = getIPString(ctx);
System.out.println(ipString + ": " + receiveStr);
}
- 3.工具类
public class ConvertCode {
/**
* @Title:bytes2HexString
* @Description:字节数组转16进制字符串
* @param b
* 字节数组
* @return 16进制字符串
* @throws
*/
public static String bytes2HexString(byte[] b) {
StringBuffer result = new StringBuffer();
String hex;
for (int i = 0; i < b.length; i++) {
hex = Integer.toHexString(b[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
result.append(hex.toUpperCase());
}
return result.toString();
}
/**
* @Title:hexString2Bytes
* @Description:16进制字符串转字节数组
* @param src 16进制字符串
* @return 字节数组
*/
public static byte[] hexString2Bytes(String src) {
int l = src.length() / 2;
byte[] ret = new byte[l];
for (int i = 0; i < l; i++) {
ret[i] = (byte) Integer.valueOf(src.substring(i * 2, i * 2 + 2), 16).byteValue();
}
return ret;
}
/**
* @Title:string2HexString
* @Description:字符串转16进制字符串
* @param strPart 字符串
* @return 16进制字符串
*/
public static String string2HexString(String strPart) {
StringBuffer hexString = new StringBuffer();
for (int i = 0; i < strPart.length(); i++) {
int ch = (int) strPart.charAt(i);
String strHex = Integer.toHexString(ch);
hexString.append(strHex);
}
return hexString.toString();
}
/**
* @Title:hexString2String
* @Description:16进制字符串转字符串
* @param src
* 16进制字符串
* @return 字节数组
* @throws
*/
public static String hexString2String(String src) {
String temp = "";
for (int i = 0; i < src.length() / 2; i++) {
//System.out.println(Integer.valueOf(src.substring(i * 2, i * 2 + 2),16).byteValue());
temp = temp+ (char)Integer.valueOf(src.substring(i * 2, i * 2 + 2),16).byteValue();
}
return temp;
}
/**
* @Title:char2Byte
* @Description:字符转成字节数据char-->integer-->byte
* @param src
* @return
* @throws
*/
public static Byte char2Byte(Character src) {
return Integer.valueOf((int)src).byteValue();
}
/**
* @Title:intToHexString
* @Description:10进制数字转成16进制
* @param a 转化数据
* @param len 占用字节数
* @return
* @throws
*/
public static String intToHexString(int a,int len){
len<<=1;
String hexString = Integer.toHexString(a);
int b = len -hexString.length();
if(b>0){
for(int i=0;i<b;i++) {
hexString = "0" + hexString;
}
}
return hexString;
}
/**
* 将16进制的2个字符串进行异或运算
* http://blog.csdn.net/acrambler/article/details/45743157
* @param strHex_X
* @param strHex_Y
* 注意：此方法是针对一个十六进制字符串一字节之间的异或运算，如对十五字节的十六进制字符串异或运算：1312f70f900168d900007df57b4884
先进行拆分：13 12 f7 0f 90 01 68 d9 00 00 7d f5 7b 48 84
13 xor 12-->1
1 xor f7-->f6
f6 xor 0f-->f9
....
62 xor 84-->e6
即，得到的一字节校验码为：e6
* @return
*/
public static String xor(String strHex_X,String strHex_Y){
//将x、y转成二进制形式
String anotherBinary=Integer.toBinaryString(Integer.valueOf(strHex_X,16));
String thisBinary=Integer.toBinaryString(Integer.valueOf(strHex_Y,16));
String result = "";
//判断是否为8位二进制，否则左补零
if(anotherBinary.length() != 8){
for (int i = anotherBinary.length(); i <8; i++) {
anotherBinary = "0"+anotherBinary;
}
}
if(thisBinary.length() != 8){
for (int i = thisBinary.length(); i <8; i++) {
thisBinary = "0"+thisBinary;
}
}
//异或运算
for(int i=0;i<anotherBinary.length();i++){
//如果相同位置数相同，则补0，否则补1
if(thisBinary.charAt(i)==anotherBinary.charAt(i))
result+="0";
else{
result+="1";
}
}
return Integer.toHexString(Integer.parseInt(result, 2));
}
/**
* Convert byte[] to hex string.这里我们可以将byte转换成int
* @param src byte[] data
* @return hex string
*/
public static String bytes2Str(byte[] src){
StringBuilder stringBuilder = new StringBuilder("");
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);
if (hv.length() < 2) {
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
return stringBuilder.toString();
}
/**
* @return 接收字节数据并转为16进制字符串
*/
public static String receiveHexToString(byte[] by) {
try {
/*io.netty.buffer.WrappedByteBuf buf = (WrappedByteBuf)msg;
ByteBufInputStream is = new ByteBufInputStream(buf);
byte[] by = input2byte(is);*/
String str = bytes2Str(by);
str = str.toLowerCase();
return str;
} catch (Exception ex) {
ex.printStackTrace();
System.out.println("接收字节数据并转为16进制字符串异常");
}
return null;
}
/**
* "7dd",4,'0'==>"07dd"
* @param input 需要补位的字符串
* @param size 补位后的最终长度
* @param symbol 按symol补充 如'0'
* @return
* N_TimeCheck中用到了
*/
public static String fill(String input, int size, char symbol) {
while (input.length() < size) {
input = symbol + input;
}
return input;
}
// public static void main(String args[]) {
// String productNo = "3030303032383838";
// System.out.println(hexString2String(productNo));
// productNo = "04050103000001070302050304";
// System.out.println(hexString2String(productNo));
// }
}
