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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* @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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