86fff45a
 zhaowg
电信IOT插件
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public class Utilty {
private static Utilty instance = new Utilty();
public static Utilty getInstance() {
return instance;
}
public static final int MIN_MID_VALUE = 1;
public static final int MAX_MID_VALUE = 65535;
public static int bytes2Int(byte[] b, int start, int length) {
int sum = 0;
int end = start + length;
for (int k = start; k < end; k++) {
int n = ((int) b[k]) & 0xff;
n <<= (--length) * 8;
sum += n;
}
return sum;
}
public static byte[] int2Bytes(int value, int length) {
byte[] b = new byte[length];
for (int k = 0; k < length; k++) {
b[length - k - 1] = (byte) ((value >> 8 * k) & 0xff);
}
return b;
}
public boolean isValidofMid(int mId) {
if (mId < MIN_MID_VALUE || mId > MAX_MID_VALUE) {
return false;
}
return true;
}
public static String parseByte2HexStr(byte[] buf) {
if (null == buf) {
return null;
}
StringBuffer sb = new StringBuffer();
for (int i = 0; i < buf.length; i++) {
String hex = Integer.toHexString(buf[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
}
return sb.toString();
}
/**
* 16进制转换成为integer
* @return
*/
public static Integer hexStringToInteger(byte[] original, int from, int to) {
String s = Utilty.parseByte2HexStr(Arrays.copyOfRange(original, from, to));
return Integer.parseInt(s,16);
}
/**
* 16进制转换成为string类型字符串
* @return
*/
public static String hexStringToString(byte[] original, int from, int to) {
String s = Utilty.parseByte2HexStr(Arrays.copyOfRange(original, from, to));
if (s == null || s.equals("")) {
return null;
}
s = s.replace(" ", "");
byte[] baKeyword = new byte[s.length() / 2];
for (int i = 0; i < baKeyword.length; i++) {
try {
baKeyword[i] = (byte) (0xff & Integer.parseInt(s.substring(i * 2, i * 2 + 2), 16));
} catch (Exception e) {
e.printStackTrace();
}
}
try {
s = new String(baKeyword, "UTF-8");
new String();
} catch (Exception e1) {
e1.printStackTrace();
}
return s;
}
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