package com.ld.igds.protocol.es.dlt645.util;
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/**
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* 工具类
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*
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* @author czt
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*/
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public class Dlt645Utils {
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public static String MSG_START = "FEFEFEFE"; //起始符
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public static String MSG_END = "16"; //结尾符
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public static void main(String[] args) {
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String s = makeCheck("6857141222000068110433333433");
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System.out.println(s);
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}
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/**
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* 将6个字节的地址域，每字节2位 BCD码,转换为12位10进制数
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*/
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public static String addrToString(String str) {
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byte[] bytes = stringToBytes(str);
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return String.format("%02x%02x%02x%02x%02x%02x", bytes[5], bytes[4], bytes[3], bytes[2], bytes[1], bytes[0]);
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}
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/**
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* DLT645校验码
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*/
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public static String makeCheck(String data) {
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if (data == null || data.equals("")) {
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return "";
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}
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int total = 0;
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int len = data.length();
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int num = 0;
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while (num < len) {
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String s = data.substring(num, num + 2);
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total += Integer.parseInt(s, 16);
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num = num + 2;
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}
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/**
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* 用256求余最大是255，即16进制的FF
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*/
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int mod = total % 256;
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String hex = Integer.toHexString(mod);
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len = hex.length();
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// 如果不够校验位的长度，补0,这里用的是两位校验
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if (len < 2) {
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hex = "0" + hex;
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}
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return hex.toUpperCase();
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}
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/**
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* 将String类型转换成byte数组
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*/
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public static byte[] stringToBytes(String str) {
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if (str == null || str.equals("")) {
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return null;
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}
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byte[] bytes = new byte[str.length() / 2];
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for (int i = 0; i < bytes.length; i++) {
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String subStr = str.substring(i * 2, i * 2 + 2);
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bytes[i] = (byte) Integer.parseInt(subStr, 16);
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}
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return bytes;
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}
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/**
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* 解析返回的具体数据
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*/
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public static Double parseData(String dataStr) {
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byte[] data = stringToBytes(dataStr);
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// 每个字节-33H处理
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for (int i = 0; i < data.length; i++) {
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data[i] = (byte) (data[i] - 0x33);
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}
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StringBuilder str = new StringBuilder();
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// BCD码转换成10进制
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for (byte b : data) {
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str.insert(0, String.format("%02x", b));
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}
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return Double.parseDouble(str.toString()) * 0.01;
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}
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}
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