package com.modbus.data;
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public class ComFn {
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public static String bytesToHexString(byte[] src, int len){
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StringBuilder stringBuilder = new StringBuilder("");
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if (src == null || len <= 0) {
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return null;
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}
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for (int i = 0; i < len; i++) {
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int v = src[i] & 0xFF;
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String hv = Integer.toHexString(v).toUpperCase();
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if (hv.length() < 2) {
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stringBuilder.append(0);
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}
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stringBuilder.append(hv + " ");
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}
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return stringBuilder.toString();
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}
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/**
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* 16进制字符串 转换为对应的 byte数组
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*/
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public static byte[] hex2Bytes(String hex) {
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if (hex == null || hex.length() == 0) {
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return null;
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}
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char[] hexChars = hex.toCharArray();
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byte[] bytes = new byte[hexChars.length / 2]; // 如果 hex 中的字符不是偶数个, 则忽略最后一个
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for (int i = 0; i < bytes.length; i++) {
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bytes[i] = (byte) Integer.parseInt("" + hexChars[i * 2] + hexChars[i * 2 + 1], 16);
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}
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return bytes;
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}
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}
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