package com.sandu.ximon.admin.manager.iot.rrpc.util;
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/**
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* @author chenjiantian
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*/
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public class SupplementUtils {
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/**
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* 截取指定长度的字符串，不足以0填充前面
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*
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* @param hex 字符串
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* @param totalBit 截取长度
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* @return 截取后的字符串
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*/
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public static String suppleZero(String hex, Integer totalBit) {
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if (hex.length() > totalBit) {
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return hex.substring(0, totalBit);
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} else if (hex.length() == totalBit) {
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return hex;
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}
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totalBit = totalBit - hex.length();
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StringBuilder hexBuilder = new StringBuilder(hex);
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for (int i = 0; i < totalBit; i++) {
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hexBuilder.insert(0, "0");
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}
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hex = hexBuilder.toString();
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return hex;
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}
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/**
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* 十进制转16进制，补位0
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*
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* @param index 字符串
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* @param totalBit 截取长度
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* @return 截取后的字符串
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*/
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public static String suppleZero(Integer index, Integer totalBit) {
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String format = String.format("%02X", index);
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totalBit = totalBit - format.length();
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StringBuilder hexBuilder = new StringBuilder(format);
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for (int i = 0; i < totalBit; i++) {
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hexBuilder.insert(0, "0");
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}
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format = hexBuilder.toString();
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return format;
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}
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/**
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* 十六进制转换成字节数组
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*/
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public static byte[] hexStringToBytes(String hexString) {
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if (hexString == null || hexString.equals("")) {
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return null;
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}
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hexString = hexString.toUpperCase(); // 十六进制转大写字母
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int length = hexString.length() / 2; // 获取十六进制的长度，2个字符为一个十六进制
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char[] hexChars = hexString.toCharArray();
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byte[] d = new byte[length];
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for (int i = 0; i < length; i++) {
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int pos = i * 2;
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d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
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}
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return d;
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}
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/**
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* char转byte
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*/
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private static byte charToByte(char c) {
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return (byte) "0123456789ABCDEF".indexOf(c);
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}
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}
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