277 lines
8.7 KiB
Java
277 lines
8.7 KiB
Java
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package com.maibu.utils;
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import java.util.Arrays;
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/**
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*
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* @description 位运算工具
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* 用途：将二进制数中的每位数字1或0代表着某种开关标记，1为是,0为否，则一个数字可以代表N位的开关标记值，可有效减少过多的变量定义 或 过多的表字段
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*/
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public class BitUtils {
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/**
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* 获取二进制数字中指定位数的结果，如：1011,指定第2位，则结果是0，第3位，则结果是1
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*
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* @param num 二进制数（可以十进制数传入，也可使用0b开头的二进制数表示形式）
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* @param bit 位数（第几位，从右往左，从0开始）
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* @return
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*/
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public static int getBitFlag(long num, int bit) {
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return (int) num >> bit & 1;
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}
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/**
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* 更新二进制数字中指定位的值
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*
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* @param num 二进制数（可以十进制数传入，也可使用0b开头的二进制数表示形式）
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* @param bit 位数（第几位，从右往左，从0开始）
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* @param flagValue 位标记值（true=1,false=0）
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* @return
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*/
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public static long updateBitValue(long num, int bit, boolean flagValue) {
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if (flagValue) {
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//将某位由0改为1
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return num | (1 << bit);
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} else {
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//将某位由1改为0
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return num ^ (getBitFlag(num, bit) << bit);
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}
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}
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/**
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* 将数字转换为二制值形式字符串
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*
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* @param num
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* @return
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*/
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public static String toBinaryString(long num) {
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return Long.toBinaryString(num);
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}
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/**
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* 判断10进制数，某位是0还是1
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* @param num
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* @param i
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* @return
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*/
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public static int deter(int num, int i) {
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// 先将数字右移指定第i位，然后再用&与1运算
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return num >> (i-1) & 1;
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}
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public static String bin2hex(String input) {
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StringBuilder sb = new StringBuilder();
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int len = input.length();
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System.out.println("原数据长度：" + (len / 8) + "字节");
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for (int i = 0; i < len / 4; i++){
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//每4个二进制位转换为1个十六进制位
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String temp = input.substring(i * 4, (i + 1) * 4);
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int tempInt = Integer.parseInt(temp, 2);
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String tempHex = Integer.toHexString(tempInt).toUpperCase();
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sb.append(tempHex);
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}
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return sb.toString();
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}
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public static int bin2Dec(String binaryString){
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int sum = 0;
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for(int i = 0;i < binaryString.length();i++){
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char ch = binaryString.charAt(i);
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if(ch > '2' || ch < '0')
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throw new NumberFormatException(String.valueOf(i));
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sum = sum * 2 + (binaryString.charAt(i) - '0');
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}
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return sum;
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}
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public static int[] string2Ins(String input) {
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StringBuilder in = new StringBuilder(input);
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int remainder = in.length() % 8;
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if (remainder > 0)
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for (int i = 0; i < 8 - remainder; i++)
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in.append("0");
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int[] result = new int[in.length() /8];
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// Step 8 Apply compression
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for (int i = 0; i < result.length; i++)
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result[i] = Integer.parseInt(in.substring(i * 8, i * 8 + 8), 2);
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return result;
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}
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public static byte[] string2bytes(String input) {
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StringBuilder in = new StringBuilder(input);
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int remainder = in.length() % 8;
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if (remainder > 0)
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for (int i = 0; i < 8 - remainder; i++)
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in.insert(0,"0");
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byte[] bts = new byte[in.length() / 8];
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// Step 8 Apply compression
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for (int i = 0; i < bts.length; i++)
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bts[i] = (byte) Integer.parseInt(in.substring(i * 8, i * 8 + 8), 2);
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return bts;
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}
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/**
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* 取得十制数组的from~to位,并按照十六进制转化值
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*
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* @param data
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* @param from
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* @param to
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* @return
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*/
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private static String getOctFromHexBytes(byte[] data, Object from, Object... to) {
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if (data != null && data.length > 0 && from != null) {
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try {
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byte[] value;
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int fromIndex = Integer.parseInt(from.toString());
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if (to != null && to.length > 0) {
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int toIndex = Integer.parseInt(to[0].toString());
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if (fromIndex >= toIndex || toIndex <= 0) {
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value = Arrays.copyOfRange(data, fromIndex, fromIndex + 1);
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} else {
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value = Arrays.copyOfRange(data, fromIndex, toIndex + 1);
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}
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} else {
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value = Arrays.copyOfRange(data, fromIndex, fromIndex + 1);
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}
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if (value != null && value.length > 0) {
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long octValue = 0L;
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int j = -1;
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for (int i = value.length - 1; i >= 0; i--, j++) {
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int d = value[i];
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if (d < 0) {
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d += 256;
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}
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octValue += Math.round(d * Math.pow(16, 2 * j + 2));
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}
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return new Long(octValue).toString();
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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return null;
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}
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/**
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* 十进制的字符串表示转成字节数组
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*
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* @param octString
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* 十进制格式的字符串
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* @param capacity
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* 需要填充的容量(可选)
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* @return 转换后的字节数组
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**/
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private static byte[] octInt2ByteArray(Integer oct, int... capacity) {
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return hexString2ByteArray(Integer.toHexString(oct), capacity);
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}
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/**
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* 16进制的字符串表示转成字节数组
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*
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* @param hexString
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* 16进制格式的字符串
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* @param capacity
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* 需要填充的容量(可选)
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* @return 转换后的字节数组
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**/
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private static byte[] hexString2ByteArray(String hexString, int... capacity) {
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hexString = hexString.toLowerCase();
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if (hexString.length() % 2 != 0) {
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hexString = "0" + hexString;
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}
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int length = hexString.length() / 2;
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if (length < 1) {
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length = 1;
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}
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int size = length;
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if (capacity != null && capacity.length > 0 && capacity[0] >= length) {
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size = capacity[0];
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}
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final byte[] byteArray = new byte[size];
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int k = 0;
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for (int i = 0; i < size; i++) {
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if (i < size - length) {
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byteArray[i] = 0;
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} else {
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byte high = (byte) (Character.digit(hexString.charAt(k), 16) & 0xff);
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if (k + 1 < hexString.length()) {
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byte low = (byte) (Character.digit(hexString.charAt(k + 1), 16) & 0xff);
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byteArray[i] = (byte) (high << 4 | low);
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} else {
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byteArray[i] = (byte) (high);
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}
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k += 2;
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}
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}
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return byteArray;
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}
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/**
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* 连接字节流
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*
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* @return
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*/
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private static byte[] append(byte[] datas, byte[] data) {
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if (datas == null) {
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return data;
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}
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if (data == null) {
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return datas;
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} else {
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return concat(datas, data);
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}
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}
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/**
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* 字节流拼接
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*
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* @param data
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* 字节流
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* @return 拼接后的字节数组
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**/
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private static byte[] concat(byte[]... data) {
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if (data != null && data.length > 0) {
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int size = 0;
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for (int i = 0; i < data.length; i++) {
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size += data[i].length;
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}
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byte[] byteArray = new byte[size];
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int pos = 0;
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for (int i = 0; i < data.length; i++) {
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byte[] b = data[i];
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for (int j = 0; j < b.length; j++) {
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byteArray[pos++] = b[j];
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}
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}
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return byteArray;
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}
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return null;
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}
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public static byte[] hexStringToByteArray(String s) {
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int len = s.length();
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byte[] data = new byte[len / 2];
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for (int i = 0; i < len; i += 2) {
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data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
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+ Character.digit(s.charAt(i+1), 16));
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}
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return data;
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}
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public static void main(String[] args) {
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String s = bin2hex("1111111000000000");
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int i = bin2Dec("1111111000000000");
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byte[] ints = string2bytes("111111000000000");
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System.out.println(s);
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System.out.println(i);
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}
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}
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