New file |
| | |
| | | package com.dy.common.util; |
| | | |
| | | import java.util.Locale; |
| | | |
| | | |
| | | public class ByteUtil { |
| | | |
| | | /** |
| | | * 将字节数组合并到字节数组上 |
| | | * @param bGroup1 被合并数组 |
| | | * @param bGroup2 合并数组 |
| | | * @return 合并后数组 |
| | | */ |
| | | public static byte[] bytesMerge(byte[] bGroup1, byte[] bGroup2){ |
| | | if(bGroup1 == null && bGroup2 == null){ |
| | | return null ; |
| | | }else if(bGroup1 == null && bGroup2 != null){ |
| | | return bGroup2 ; |
| | | }else if(bGroup1 != null && bGroup2 == null){ |
| | | return bGroup1 ; |
| | | }else{ |
| | | //dest != null && append != null |
| | | byte[] bs = new byte[bGroup1.length + bGroup2.length] ; |
| | | System.arraycopy(bGroup1, 0, bs, 0, bGroup1.length) ; |
| | | System.arraycopy(bGroup2, 0, bs, bGroup1.length, bGroup2.length) ; |
| | | return bs ; |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 判断所有字节是否为0xFF |
| | | * @param bs |
| | | * @param index |
| | | * @param len |
| | | * @return |
| | | * @throws Exception |
| | | */ |
| | | public static boolean bytesIsAll0xFF(byte[] bs, int index, int len)throws Exception { |
| | | int count = 0 ; |
| | | for(int i = index; i < index + len; i++){ |
| | | if(bs[i] == (byte)0xFF){ |
| | | count++ ; |
| | | } |
| | | } |
| | | return count==len?true:false ; |
| | | } |
| | | |
| | | /** |
| | | * 二进制转十进制数 |
| | | * @param str |
| | | * @return |
| | | * @throws Exception |
| | | */ |
| | | public static int binary2Int(String str) throws Exception { |
| | | int cnt=0; |
| | | int sum=0; |
| | | str=new StringBuilder(str).reverse().toString();//反转字符串 |
| | | for(int i=0;i<str.length();i++){ |
| | | cnt++; |
| | | if (str.charAt(i)=='1'){ |
| | | int mul=1; |
| | | for (int j=1;j<cnt;j++){ |
| | | mul*=2; |
| | | } |
| | | sum+=mul; |
| | | } |
| | | else continue; |
| | | } |
| | | return sum; |
| | | } |
| | | |
| | | |
| | | /** |
| | | * 字节转存二进制 |
| | | * |
| | | * @param b byte |
| | | * @throws Exception |
| | | * @return String |
| | | */ |
| | | public static String byte2Binary(byte b) throws Exception { |
| | | int n = (b + 256) % 256 + 256; |
| | | try { |
| | | return Integer.toBinaryString(n).substring(1); |
| | | } catch (Exception e) { |
| | | throw new Exception("字节转换成二进制的字符串出错!", null); |
| | | } |
| | | } |
| | | /** |
| | | * 字节转存8位二进制 |
| | | * |
| | | * @param b |
| | | * byte |
| | | * @throws Exception |
| | | * @return String |
| | | */ |
| | | public static String byte2bit8Binary(byte b) throws Exception { |
| | | String s = byte2Binary(b); |
| | | int len = s.length(); |
| | | for (int i = 0; i < 8 - len; i++) { |
| | | s = "0" + s; |
| | | } |
| | | return s; |
| | | } |
| | | |
| | | /** |
| | | * 字节取bit |
| | | * @param b |
| | | * @param index |
| | | * @throws Exception |
| | | * @return String |
| | | */ |
| | | public static byte[] getBit(byte b) throws Exception { |
| | | byte[] bs = new byte[8] ; |
| | | bs[0] = (byte)(b & 1) ; |
| | | bs[1] = (byte)((b & 2) >> 1) ; |
| | | bs[2] = (byte)((b & 4) >> 2) ; |
| | | bs[3] = (byte)((b & 8) >> 3) ; |
| | | bs[4] = (byte)((b & 16) >> 4) ; |
| | | bs[5] = (byte)((b & 32) >> 5) ; |
| | | bs[6] = (byte)((b & 64) >> 6) ; |
| | | bs[7] = (byte)((b & 128) >> 7) ; |
| | | return bs; |
| | | } |
| | | |
| | | /** |
| | | * 字节取bit |
| | | * @param b |
| | | * @param index |
| | | * @throws Exception |
| | | * @return String |
| | | */ |
| | | public static byte getBit(byte b, byte index) throws Exception { |
| | | if(index == 0){ |
| | | return (byte)(b & 1) ; |
| | | }else if(index == 1){ |
| | | return (byte)((b & 2) >> 1) ; |
| | | }else if(index == 2){ |
| | | return (byte)((b & 4) >> 2) ; |
| | | }else if(index == 3){ |
| | | return (byte)((b & 8) >> 3) ; |
| | | }else if(index == 4){ |
| | | return (byte)((b & 16) >> 4) ; |
| | | }else if(index == 5){ |
| | | return (byte)((b & 32) >> 5) ; |
| | | }else if(index == 6){ |
| | | return (byte)((b & 64) >> 6) ; |
| | | }else if(index == 7){ |
| | | return (byte)((b & 128) >> 7) ; |
| | | } |
| | | return 0; |
| | | } |
| | | |
| | | |
| | | /** |
| | | * 一个字节转正整数 |
| | | * |
| | | * @param b |
| | | * byte |
| | | * @throws Exception |
| | | * @return String |
| | | */ |
| | | public static Short byte2PlusInt(byte b) throws Exception { |
| | | short v = b ; |
| | | if(v < 0){ |
| | | v = (short)(255 + v + 1) ; |
| | | } |
| | | return v ; |
| | | } |
| | | |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * double转换byte |
| | | * @param bs byte[] |
| | | * @param value double double类型的参数 |
| | | * @param from int |
| | | */ |
| | | public static void double2Bytes_BE(byte[] bs, double value, int from)throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 8); |
| | | if (b) { |
| | | Long l = Double.doubleToLongBits(value); |
| | | long2Bytes_BE(bs, l, from); |
| | | } else { |
| | | throw new Exception("double2Bytes时数组越界"); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * double转换byte,字节顺序是倒的 |
| | | * @param bs byte[] |
| | | * @param value double double类型的参数 |
| | | * @param from int |
| | | */ |
| | | public static void double2Bytes_LE(byte[] bs, double value, int from)throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 8); |
| | | if (b) { |
| | | Long l = Double.doubleToLongBits(value); |
| | | long2Bytes_LE(bs, l, from); |
| | | } else { |
| | | throw new Exception("double2Bytes时数组越界"); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * byte转换double |
| | | * @param bs byte[] |
| | | * @param from int |
| | | */ |
| | | public static double bytes2Double_BE(byte[] bs, int from) throws Exception { |
| | | long l = bytes2Long_BE(bs, from); |
| | | return Double.longBitsToDouble(l); |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * byte转换double,字节顺序是倒的 |
| | | * @param bs byte[] |
| | | * @param from int |
| | | */ |
| | | public static double bytes2Double_LE(byte[] bs, int from) throws Exception { |
| | | long l = bytes2Long_LE(bs, from); |
| | | return Double.longBitsToDouble(l); |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * float转换byte |
| | | * @value bs byte[] |
| | | * @value value float float类型的参数 |
| | | * @value from int |
| | | */ |
| | | public static void float2Bytes_BE(byte[] bs, float value, int from) |
| | | throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 4); |
| | | if (b) { |
| | | Integer it = Float.floatToIntBits(value); |
| | | int2Bytes_BE(bs, it, from); |
| | | } else { |
| | | throw new Exception("float2Bytes时数组越界"); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * float转换byte,字节顺序是倒的 |
| | | * @value bs byte[] |
| | | * @value value float float类型的参数 |
| | | * @value from int |
| | | */ |
| | | public static void float2Bytes_LE(byte[] bs, float value, int from) throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 4); |
| | | if (b) { |
| | | Integer it = Float.floatToIntBits(value); |
| | | int2Bytes_LE(bs, it, from); |
| | | } else { |
| | | throw new Exception("float2Bytes时数组越界"); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * byte转换float |
| | | * @value bs byte[] |
| | | * @value from int |
| | | */ |
| | | public static float bytes2Float_BE(byte[] bs, int from) throws Exception { |
| | | int i = bytes2Int_BE(bs, from); |
| | | return Float.intBitsToFloat(i); |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * byte转换float,字节顺序是倒的 |
| | | * @value bs byte[] |
| | | * @value from int |
| | | */ |
| | | public static float bytes2Float_LE(byte[] bs, int from) throws Exception { |
| | | int i = bytes2Int_LE(bs, from); |
| | | return Float.intBitsToFloat(i); |
| | | } |
| | | |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * 转换long型为byte数组 |
| | | * @value bs byte[] |
| | | * @value value long |
| | | * @value from int |
| | | */ |
| | | public static void long2Bytes_BE(byte[] bs, long value, int from)throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 8); |
| | | if (b) { |
| | | for (int i = 7; i >= 0; i--) { |
| | | bs[from + i] = Long.valueOf(value & 0xff).byteValue();// 将最低位保存在最低位 |
| | | value = value >> 8; // 向右移8位 |
| | | if(value == 0){ |
| | | break ; |
| | | } |
| | | } |
| | | } else { |
| | | throw new Exception("long2Bytes时数组越界"); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * 转换long型为byte数组 |
| | | * @value bs byte[] |
| | | * @value value long |
| | | * @value from int |
| | | */ |
| | | public static void long2Bytes_LE(byte[] bs, long value, int from)throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 8); |
| | | if (b) { |
| | | for (int i = 0; i < 8; i++) { |
| | | bs[from + i] = Long.valueOf(value & 0xff).byteValue(); |
| | | value = value >> 8; |
| | | if(value == 0){ |
| | | break ; |
| | | } |
| | | } |
| | | } else { |
| | | throw new Exception("long2Bytes时数组越界"); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * 8位字节数组转换为长整型 |
| | | * @param bs byte[] |
| | | * @return |
| | | */ |
| | | public static long bytes2Long_BE(byte[] bs) { |
| | | int len = bs.length ; |
| | | if (len > 0) { |
| | | long l = 0; |
| | | long[] ls = new long[len] ; |
| | | for(int i = 0 ; i < len; i++){ |
| | | ls[i] = bs[i] ; |
| | | } |
| | | for(int i = len-1 ; i >= 0; i--){ |
| | | ls[(len - 1) - i] <<= 8 * i ; |
| | | } |
| | | for(int i = 0 ; i < len; i++){ |
| | | l = l | ls[i] ; |
| | | } |
| | | return l; |
| | | } |
| | | return 0L ; |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * 8位字节数组转换为长整型 |
| | | * @param bs byte[] |
| | | * @param from int |
| | | * @return |
| | | */ |
| | | public static long bytes2Long_BE(byte[] bs, int from) throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 8); |
| | | if (b) { |
| | | long s = 0; |
| | | long s0 = bs[from + 0] ;// 最低位 |
| | | long s1 = bs[from + 1] ; |
| | | long s2 = bs[from + 2] ; |
| | | long s3 = bs[from + 3] ; |
| | | long s4 = bs[from + 4] ; |
| | | long s5 = bs[from + 5] ; |
| | | long s6 = bs[from + 6] ; |
| | | long s7 = bs[from + 7] ; |
| | | |
| | | // s7不变 |
| | | s6 <<= 8; |
| | | s5 <<= 16; |
| | | s4 <<= 24; |
| | | s3 <<= 8 * 4; |
| | | s2 <<= 8 * 5; |
| | | s1 <<= 8 * 6; |
| | | s0 <<= 8 * 7; |
| | | s = s0 | s1 | s2 | s3 | s4 | s5 | s6 | s7; |
| | | return s; |
| | | } else { |
| | | throw new Exception("byte2Long时数组越界"); |
| | | } |
| | | } |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * 8位字节数组转换为长整型 |
| | | * @param bs byte[] |
| | | * @param from int |
| | | * @param end int |
| | | * @return |
| | | */ |
| | | public static long bytes2Long_BE(byte[] bs, int from, int end) throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, end); |
| | | if (b) { |
| | | short len = (short)(end - from + 1) ; |
| | | long[] ls = new long[len] ; |
| | | for(short i = 0 ; i < len; i++){ |
| | | ls[i] = bs[from + i] ; |
| | | } |
| | | for(short i = (short)(len-1) ; i >= 0; i--){ |
| | | ls[i] <<= 8 * (len - (i + 1)) ; |
| | | } |
| | | long s = 0; |
| | | for(short i = 0 ; i < len; i++){ |
| | | s = s | ls[i] ; |
| | | } |
| | | return s; |
| | | } else { |
| | | throw new Exception("byte2Long时数组越界"); |
| | | } |
| | | } |
| | | |
| | | |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * 8位字节数组转换为长整型 |
| | | * @param bs byte[] |
| | | * @return |
| | | */ |
| | | public static long bytes2Long_LE(byte[] bs) { |
| | | int len = bs.length ; |
| | | if (len > 0) { |
| | | long l = 0; |
| | | long[] ls = new long[len] ; |
| | | for(int i = 0 ; i < len; i++){ |
| | | ls[i] = bs[i] ; |
| | | } |
| | | for(int i = 0 ; i < len; i++){ |
| | | ls[(len - 1) - i] <<= 8 * i ; |
| | | } |
| | | for(int i = 0 ; i < len; i++){ |
| | | l = l | ls[i] ; |
| | | } |
| | | return l; |
| | | } |
| | | return 0L ; |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * 8位字节数组转换为长整型 |
| | | * @param bs byte[] |
| | | * @param from int |
| | | * @return |
| | | */ |
| | | public static long bytes2Long_LE(byte[] bs, int from) throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 8); |
| | | if (b) { |
| | | long s = 0; |
| | | long s0 = bs[from + 0] ;// 最低位 |
| | | long s1 = bs[from + 1] ; |
| | | long s2 = bs[from + 2] ; |
| | | long s3 = bs[from + 3] ; |
| | | long s4 = bs[from + 4] ; |
| | | long s5 = bs[from + 5] ; |
| | | long s6 = bs[from + 6] ; |
| | | long s7 = bs[from + 7] ; |
| | | |
| | | // s0不变 |
| | | s1 <<= 8; |
| | | s2 <<= 16; |
| | | s3 <<= 24; |
| | | s4 <<= 8 * 4; |
| | | s5 <<= 8 * 5; |
| | | s6 <<= 8 * 6; |
| | | s7 <<= 8 * 7; |
| | | s = s0 | s1 | s2 | s3 | s4 | s5 | s6 | s7; |
| | | return s; |
| | | } else { |
| | | throw new Exception("byte2Long时数组越界"); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * 8位字节数组转换为长整型 |
| | | * @param bs byte[] |
| | | * @param from int |
| | | * @param end int |
| | | * @return |
| | | */ |
| | | public static long bytes2Long_LE(byte[] bs, int from, int end) throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, end); |
| | | if (b) { |
| | | short len = (short)(end - from + 1) ; |
| | | long[] ls = new long[len] ; |
| | | for(short i = 0 ; i < len; i++){ |
| | | ls[i] = bs[from + i] ; |
| | | } |
| | | for(short i = 0 ; i < len; i++){ |
| | | ls[i] <<= 8 * i ; |
| | | } |
| | | long s = 0; |
| | | for(short i = 0 ; i < len; i++){ |
| | | s = s | ls[i] ; |
| | | } |
| | | return s; |
| | | } else { |
| | | throw new Exception("byte2Long时数组越界"); |
| | | } |
| | | } |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * int类型转换成4位byte数组 |
| | | * @value bs byte[] |
| | | * @value value int int类型的参数 |
| | | * @value from int |
| | | */ |
| | | public static void int2Bytes_BE(byte[] bs, int value, int from)throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 4); |
| | | if (b) { |
| | | for (int i = 3; i >= 0; i--) { |
| | | bs[from + i] = Integer.valueOf(value & 0xff).byteValue();// 将最低位保存在高字节 |
| | | value = value >> 8; // 向右移8位 |
| | | if(value == 0){ |
| | | break ; |
| | | } |
| | | } |
| | | } else { |
| | | throw new Exception("int2Bytes时数组越界"); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * int类型转换成4位byte数组,字节顺序是倒的 |
| | | * @value bs byte[] |
| | | * @value value int int类型的参数 |
| | | * @value from int |
| | | */ |
| | | public static void int2Bytes_LE(byte[] bs, int value, int from)throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 4); |
| | | if (b) { |
| | | for (int i = 0; i < 4; i++) { |
| | | bs[from + i] = Integer.valueOf(value & 0xff).byteValue();// 将最低位保存在低字节 |
| | | value = value >> 8; // 向右移8位 |
| | | if(value == 0){ |
| | | break ; |
| | | } |
| | | } |
| | | } else { |
| | | throw new Exception("int2Bytes时数组越界"); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * 4位字节数组转换为整型 |
| | | * @param b |
| | | * @return |
| | | */ |
| | | public static int bytes2Int_BE(byte[] bs, int from) throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 4); |
| | | if (b) { |
| | | int s = 0; |
| | | int s0 = bs[from + 0] ;// 最低位 |
| | | int s1 = bs[from + 1] ; |
| | | int s2 = bs[from + 2] ; |
| | | int s3 = bs[from + 3] ; |
| | | |
| | | // s3不变 |
| | | s2 <<= 8; |
| | | s1 <<= 16; |
| | | s0 <<= 24; |
| | | s = s0 | s1 | s2 | s3; |
| | | return s; |
| | | } else { |
| | | throw new Exception("byte2Int时数组越界"); |
| | | } |
| | | } |
| | | |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * 4位字节数组转换为整型,字节顺序是倒的 |
| | | * @param b |
| | | * @return |
| | | */ |
| | | public static int bytes2Int_LE(byte[] bs, int from) throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 4); |
| | | if (b) { |
| | | int s = 0; |
| | | int s0 = bs[from + 0] ;// 最低位 |
| | | int s1 = bs[from + 1] ; |
| | | int s2 = bs[from + 2] ; |
| | | int s3 = bs[from + 3] ; |
| | | |
| | | // s0不变 |
| | | s1 <<= 8; |
| | | s2 <<= 16; |
| | | s3 <<= 24; |
| | | s = s0 | s1 | s2 | s3; |
| | | return s; |
| | | } else { |
| | | throw new Exception("byte2Int时数组越界"); |
| | | } |
| | | } |
| | | |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * short类型转换成byte数组 |
| | | * @value bs byte[] |
| | | * @value value short |
| | | * @value from int |
| | | */ |
| | | public static void short2Bytes_BE(byte[] bs, short value, int from)throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 2); |
| | | if (b) { |
| | | for (int i = 1; i >= 0 ; i--) { |
| | | bs[from + i] = Integer.valueOf(value & 0xff).byteValue();// 将低位保存在高字节 |
| | | value = (short) (value >> 8); // 向右移8位 |
| | | } |
| | | } else { |
| | | throw new Exception("short2Bytes时数组越界"); |
| | | } |
| | | } |
| | | |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * short类型转换成byte数组,字节顺序是倒的 |
| | | * @value bs byte[] |
| | | * @value value short |
| | | * @value from int |
| | | */ |
| | | public static void short2Bytes_LE(byte[] bs, short value, int from)throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 2); |
| | | if (b) { |
| | | for (int i = 0; i < 2; i++) { |
| | | bs[from + i] = Integer.valueOf(value & 0xff).byteValue();// 将最低位保存在低字节 |
| | | value = (short) (value >> 8); // 向右移8位 |
| | | } |
| | | } else { |
| | | throw new Exception("short2Bytes时数组越界"); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * short类型转换成byte数组 |
| | | * @value value short |
| | | * @value from int |
| | | */ |
| | | public static byte[] short2Bytes_BE(short value)throws Exception { |
| | | byte[] bs = new byte[2] ; |
| | | for (int i = 1; i >= 0 ; i--) { |
| | | bs[i] = (byte)(value & 0xff) ;// 将低位保存在高字节 |
| | | value = (short) (value >> 8); // 向右移8位 |
| | | } |
| | | return bs ; |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * short类型转换成byte数组,字节顺序是倒的 |
| | | * @value value short |
| | | * @value from int |
| | | */ |
| | | public static byte[] short2Bytes_LE(short value)throws Exception { |
| | | byte[] bs = new byte[2] ; |
| | | for (int i = 0; i < 2; i++) { |
| | | bs[i] = (byte)(value & 0xff) ;// 将最低位保存在低字节 |
| | | value = (short) (value >> 8); // 向右移8位 |
| | | } |
| | | return bs ; |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * 2位字节数组转换为短整型 |
| | | * @param b |
| | | * @return |
| | | */ |
| | | public static short bytes2Short_BE(byte[] bs, int from) throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 2); |
| | | if (b) { |
| | | int s = 0; |
| | | int s0 = bs[from + 0] ; |
| | | int s1 = bs[from + 1] ; |
| | | |
| | | // s1不变 |
| | | s0 <<= 8; |
| | | s = s0 | s1; |
| | | return (short) s; |
| | | |
| | | } else { |
| | | throw new Exception("byte2Short时数组越界"); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * 2位字节数组转换为短整型,字节顺序是倒的 |
| | | * @param b |
| | | * @return |
| | | */ |
| | | public static short bytes2Short_LE(byte[] bs, int from) throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, (from - 1) + 2); |
| | | if (b) { |
| | | int s = 0; |
| | | int s0 = bs[from + 0] ; |
| | | int s1 = bs[from + 1] ; |
| | | |
| | | // s0不变 |
| | | s1 <<= 8; |
| | | s = s0 | s1; |
| | | return (short) s; |
| | | |
| | | } else { |
| | | throw new Exception("byte2Short时数组越界"); |
| | | } |
| | | } |
| | | /** |
| | | * 字符到一字节转换 |
| | | * |
| | | * @value bs byte[] |
| | | * @value ch char char类型的参数 |
| | | * @value index int |
| | | * @return |
| | | */ |
| | | public static void char2Bytes(byte[] bs, char ch, int index)throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, index); |
| | | if (b) { |
| | | bs[index] = (byte) ch; |
| | | } else { |
| | | throw new Exception("char2Bytes时数组越界"); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 一字节转换为字符 |
| | | * |
| | | * @param b |
| | | * @value index int |
| | | * @return |
| | | */ |
| | | public static char bytes2Char(byte[] bs, int index) throws Exception { |
| | | boolean b = isOutOfArrLength(bs.length, index); |
| | | if (b) { |
| | | return (char) bs[index]; |
| | | } else { |
| | | throw new Exception("byte2Char时数组越界"); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 字符串型数字转成byte |
| | | * |
| | | * @param s |
| | | * @return |
| | | * @throws Exception |
| | | */ |
| | | public static byte string2byte(String s) throws Exception { |
| | | int n = 0; |
| | | try { |
| | | n = Integer.parseInt(s); |
| | | } catch (Exception e) { |
| | | throw new Exception("字符串型数字字节时出错,不是合法数字:" + s, null); |
| | | } |
| | | return (byte) n; |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * 字符串转换成byte数组 |
| | | * @value bs byte[] |
| | | * @value str String |
| | | * @value from int |
| | | * @return |
| | | * @throws java.io.UnsupportedEncodingException |
| | | */ |
| | | public static int string2Bytes_BE(byte[] bs, String str, int from, int end)throws Exception { |
| | | byte[] bb = str.getBytes(); |
| | | boolean b = isOutOfArrLength(bs.length, (from -1 + bb.length)); |
| | | if (b) { |
| | | if(end - from + 1 < bb.length){ |
| | | throw new Exception("string2Bytes时,字符串转成的字节数组超过的协议定义的长度 "); |
| | | }else{ |
| | | for (int i = 0; i < bb.length; i++) { |
| | | bs[from + i] = bb[i]; |
| | | } |
| | | } |
| | | } else { |
| | | throw new Exception("string2Bytes时数组越界"); |
| | | } |
| | | return bb.length ; |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * 字符串转换成byte数组 |
| | | * @value bs byte[] |
| | | * @value str String |
| | | * @value from int |
| | | * @return |
| | | * @throws java.io.UnsupportedEncodingException |
| | | */ |
| | | public static int string2Bytes_LE(byte[] bs, String str, int from, int end)throws Exception { |
| | | byte[] bb = str.getBytes(); |
| | | boolean b = isOutOfArrLength(bs.length, (from -1 + bb.length)); |
| | | if (b) { |
| | | if(end - from + 1 < bb.length){ |
| | | throw new Exception("string2Bytes时,字符串转成的字节数组超过的协议定义的长度 "); |
| | | }else{ |
| | | for (int i = bb.length - 1; i >= 0; i--) { |
| | | bs[from + i] = bb[i]; |
| | | } |
| | | } |
| | | } else { |
| | | throw new Exception("string2Bytes时数组越界"); |
| | | } |
| | | return bb.length ; |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * 字符串转换成byte数组 |
| | | * @value bs byte[] |
| | | * @value str String |
| | | * @value from int |
| | | * @return |
| | | * @throws java.io.UnsupportedEncodingException |
| | | */ |
| | | public static int string2Bytes_BE(byte[] bs, String str, int from)throws Exception { |
| | | byte[] bb = str.getBytes(); |
| | | boolean b = isOutOfArrLength(bs.length, (from -1 + bb.length)); |
| | | if (b) { |
| | | for (int i = 0; i < bb.length; i++) { |
| | | bs[from + i] = bb[i]; |
| | | } |
| | | } else { |
| | | throw new Exception("string2Bytes时数组越界"); |
| | | } |
| | | return bb.length ; |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * 字符串转换成byte数组 |
| | | * @value bs byte[] |
| | | * @value str String |
| | | * @value from int |
| | | * @return |
| | | * @throws java.io.UnsupportedEncodingException |
| | | */ |
| | | public static int string2Bytes_LE(byte[] bs, String str, int from)throws Exception { |
| | | byte[] bb = str.getBytes(); |
| | | boolean b = isOutOfArrLength(bs.length, (from -1 + bb.length)); |
| | | if (b) { |
| | | for (int i = bb.length-1; i >= 0; i--) { |
| | | bs[from + i] = bb[i]; |
| | | } |
| | | } else { |
| | | throw new Exception("string2Bytes时数组越界"); |
| | | } |
| | | return bb.length ; |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * byte数组转换成字符串 |
| | | * @value bs byte[] |
| | | * @value str String |
| | | * @value from int |
| | | * @throws java.io.UnsupportedEncodingException |
| | | */ |
| | | public static String bytes2String_BE(byte[] bs, int from, int end)throws Exception { |
| | | byte[] bb = new byte[end - from + 1]; |
| | | int count = 0 ; |
| | | for (int i = from; i <= end; i++) { |
| | | bb[count++] = bs[i]; |
| | | } |
| | | return new String(bb); |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * byte数组转换成字符串 |
| | | * @value bs byte[] |
| | | * @value str String |
| | | * @value from int |
| | | * @throws java.io.UnsupportedEncodingException |
| | | */ |
| | | public static String bytes2String_LE(byte[] bs, int from, int end)throws Exception { |
| | | byte[] bb = new byte[end - from + 1]; |
| | | int count = 0 ; |
| | | for (int i = end; i >= from; i--) { |
| | | bb[count++] = bs[i]; |
| | | } |
| | | return new String(bb); |
| | | } |
| | | |
| | | /** |
| | | * 判断数组下标是否越界 |
| | | * |
| | | * @value bsLength 数组总长度 |
| | | * @value toSite 数组偏移量 |
| | | * @return |
| | | */ |
| | | private static boolean isOutOfArrLength(int bsLength, int toSite) { |
| | | if (bsLength > toSite) { |
| | | return true; |
| | | } else { |
| | | return false; |
| | | } |
| | | } |
| | | |
| | | |
| | | /** |
| | | * 字节数组转换成十六进制的字符串 |
| | | * |
| | | * @param b byte[] |
| | | * @param hasBlank 16进制是否用空格分隔 |
| | | * @return String |
| | | */ |
| | | public static String bytes2Hex(byte[] src, boolean hasBlank){ |
| | | StringBuilder stringBuilder = new StringBuilder(""); |
| | | if (src == null || src.length <= 0) { |
| | | return null; |
| | | } |
| | | for (int i = 0; i < src.length; i++) { |
| | | int v = src[i] & 0xFF; |
| | | String str = Integer.toHexString(v); |
| | | if (str.length() < 2) { |
| | | str = "0" + str; |
| | | } |
| | | if (hasBlank) { |
| | | if (i == 0) { |
| | | stringBuilder.append(str); |
| | | } else { |
| | | stringBuilder.append(" " + str); |
| | | } |
| | | } else { |
| | | stringBuilder.append(str); |
| | | } |
| | | } |
| | | return stringBuilder.toString().toUpperCase(Locale.US); |
| | | } |
| | | /** |
| | | * 字节数组转换成十六进制的字符串 |
| | | * |
| | | * @param b byte[] |
| | | * @param hasBlank 16进制是否用空格分隔 |
| | | * @param from |
| | | * @param len |
| | | * @return String |
| | | */ |
| | | public static String bytes2Hex(byte[] src, boolean hasBlank, int from, int len){ |
| | | if (src == null || src.length <= 0 || src.length < from + len) { |
| | | return null; |
| | | } |
| | | byte[] bb = new byte[len]; |
| | | for (int i = 0 ; i < len; i++) { |
| | | bb[i] = src[from + i]; |
| | | } |
| | | return bytes2Hex(bb, hasBlank) ; |
| | | } |
| | | /** |
| | | * 十六进制转字节数组 |
| | | * @param hexString the hex string |
| | | * @return byte[] |
| | | */ |
| | | public static byte[] hex2Bytes(String hex) { |
| | | if (hex == null || hex.equals("")) { |
| | | return null; |
| | | } |
| | | hex = hex.toUpperCase(Locale.ENGLISH); |
| | | int length = hex.length() / 2; |
| | | char[] hexChars = hex.toCharArray(); |
| | | byte[] d = new byte[length]; |
| | | for (int i = 0; i < length; i++) { |
| | | int pos = i * 2; |
| | | d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1])); |
| | | } |
| | | return d; |
| | | } |
| | | /** |
| | | * 十六进制转字节数组 |
| | | * @param hexString the hex string |
| | | * @return byte[] |
| | | */ |
| | | public static int hex2Bytes(String hex, byte[] bs, int fromIndex) { |
| | | if (hex == null || hex.equals("")) { |
| | | return fromIndex; |
| | | } |
| | | hex = hex.toUpperCase(Locale.ENGLISH); |
| | | int length = hex.length() / 2; |
| | | char[] hexChars = hex.toCharArray(); |
| | | byte[] d = new byte[length]; |
| | | for (int i = 0; i < length; i++) { |
| | | int pos = i * 2; |
| | | d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1])); |
| | | } |
| | | for(int i = 0 ; i < d.length; i++){ |
| | | bs[fromIndex++] = d[i] ; |
| | | } |
| | | return fromIndex ; |
| | | } |
| | | |
| | | private static final char[] HEX_CHAR = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; |
| | | /** |
| | | * 将byte[]转换为16进制字符串 |
| | | * |
| | | * @param bytes 待转换byte[] |
| | | * @return 转换后的字符串 |
| | | */ |
| | | public static String bytesToHex(byte[] bytes) { |
| | | //一个byte为8位,可用两个十六进制位标识 |
| | | char[] buf = new char[bytes.length * 2]; |
| | | int a = 0; |
| | | int index = 0; |
| | | for (byte b : bytes) { // 使用除与取余进行转换 |
| | | if (b < 0) { |
| | | a = 256 + b; |
| | | } else { |
| | | a = b; |
| | | } |
| | | |
| | | buf[index++] = HEX_CHAR[a / 16]; |
| | | buf[index++] = HEX_CHAR[a % 16]; |
| | | } |
| | | return new String(buf); |
| | | } |
| | | |
| | | /** |
| | | * 将16进制字符串转换为byte[] |
| | | * |
| | | * @param str 待转换字符串 |
| | | * @return 转换后的byte[] |
| | | */ |
| | | public static byte[] hexToBytes(String str) { |
| | | if (str == null || "".equals(str.trim())) { |
| | | return new byte[0]; |
| | | } |
| | | |
| | | byte[] bytes = new byte[str.length() / 2]; |
| | | for (int i = 0; i < str.length() / 2; i++) { |
| | | String subStr = str.substring(i * 2, i * 2 + 2); |
| | | bytes[i] = (byte) Integer.parseInt(subStr, 16); |
| | | } |
| | | |
| | | return bytes; |
| | | } |
| | | |
| | | /** |
| | | * Convert char to byte |
| | | * @param c char |
| | | * @return byte |
| | | */ |
| | | private static byte charToByte(char c) { |
| | | return (byte) "0123456789ABCDEF".indexOf(c); |
| | | } |
| | | |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * 整形转成BCD编码 |
| | | * @param l |
| | | * @return |
| | | */ |
| | | public static byte[] int2BCD_BE(int i)throws Exception { |
| | | String str = "" + i; |
| | | byte[] b = null; |
| | | if (str.length() % 2 == 0) { |
| | | b = new byte[str.length() / 2]; |
| | | } else { |
| | | b = new byte[(str.length() / 2) + 1]; |
| | | } |
| | | encodeBCD_BE(str, b, 0, b.length); |
| | | |
| | | return b; |
| | | } |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * 整形转成BCD编码,字节顺序是倒的 |
| | | * @param l |
| | | * @return |
| | | */ |
| | | public static byte[] int2BCD_LE(int i)throws Exception { |
| | | String str = "" + i; |
| | | byte[] b = null; |
| | | if (str.length() % 2 == 0) { |
| | | b = new byte[str.length() / 2]; |
| | | } else { |
| | | b = new byte[(str.length() / 2) + 1]; |
| | | } |
| | | encodeBCD_LE(str, b, 0, b.length); |
| | | |
| | | return b; |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * 长整形转成BCD编码 |
| | | * @param l |
| | | * @return |
| | | */ |
| | | public static byte[] long2BCD_BE(long l)throws Exception { |
| | | String str = "" + l; |
| | | byte[] b = null; |
| | | if (str.length() % 2 == 0) { |
| | | b = new byte[str.length() / 2]; |
| | | } else { |
| | | b = new byte[(str.length() / 2) + 1]; |
| | | } |
| | | encodeBCD_BE(str, b, 0, b.length); |
| | | |
| | | return b; |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * 长整形转成BCD编码,字节顺序是倒的 |
| | | * @param l |
| | | * @return |
| | | */ |
| | | public static byte[] long2BCD_LE(long l) throws Exception { |
| | | String str = "" + l; |
| | | byte[] b = null; |
| | | if (str.length() % 2 == 0) { |
| | | b = new byte[str.length() / 2]; |
| | | } else { |
| | | b = new byte[(str.length() / 2) + 1]; |
| | | } |
| | | encodeBCD_LE(str, b, 0, b.length); |
| | | |
| | | return b; |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * 字符串型数字转成BCD编码 |
| | | * @param s |
| | | * @return |
| | | * @throws Exception |
| | | */ |
| | | public static byte[] string2BCD_BE(String s) throws Exception { |
| | | byte[] b = null; |
| | | if (s.length() % 2 == 0) { |
| | | b = new byte[s.length() / 2]; |
| | | } else { |
| | | b = new byte[(s.length() / 2) + 1]; |
| | | } |
| | | |
| | | encodeBCD_BE(s, b, 0, b.length); |
| | | |
| | | return b ; |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * 字符串转换成byte数组 |
| | | * @value bs byte[] |
| | | * @value str String |
| | | * @value fromIndex int |
| | | * @return |
| | | * @throws java.io.Exception |
| | | */ |
| | | public static int string2BCD_BE(byte[] bs, String str, int fromIndex)throws Exception { |
| | | byte[] bb = string2BCD_BE(str); |
| | | boolean b = isOutOfArrLength(bs.length, (fromIndex -1 + bb.length)); |
| | | if (b) { |
| | | for (int i = 0; i < bb.length; i++) { |
| | | bs[fromIndex + i] = bb[i]; |
| | | } |
| | | } else { |
| | | throw new Exception("string2BCD时数组越界"); |
| | | } |
| | | return bb.length ; |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * 字符串型数字转成BCD编码,字节顺序是倒的 |
| | | * @param s |
| | | * @return |
| | | * @throws Exception |
| | | */ |
| | | public static byte[] string2BCD_LE(String s) throws Exception { |
| | | byte[] b = null; |
| | | if (s.length() % 2 == 0) { |
| | | b = new byte[s.length() / 2]; |
| | | } else { |
| | | b = new byte[(s.length() / 2) + 1]; |
| | | } |
| | | encodeBCD_LE(s, b, 0, b.length); |
| | | |
| | | return b; |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * 字符串转换成byte数组 |
| | | * @value bs byte[] |
| | | * @value str String |
| | | * @value fromIndex int |
| | | * @return |
| | | * @throws java.io.Exception |
| | | */ |
| | | public static int string2BCD_LE(byte[] bs, String str, int fromIndex)throws Exception { |
| | | byte[] bb = string2BCD_LE(str); |
| | | boolean b = isOutOfArrLength(bs.length, (fromIndex -1 + bb.length)); |
| | | if (b) { |
| | | for (int i = bb.length-1; i >= 0 ; i--) { |
| | | bs[fromIndex + i] = bb[i]; |
| | | } |
| | | } else { |
| | | throw new Exception("string2BCD时数组越界"); |
| | | } |
| | | return bb.length ; |
| | | } |
| | | |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * BCD编码转成整型 |
| | | * @param b |
| | | * @param startIndex |
| | | * @param endIndex |
| | | * @return |
| | | * @throws Exception |
| | | */ |
| | | public static int BCD2Int_BE(byte b) throws Exception { |
| | | String str = ""; |
| | | str = decodeBCD_BE(new byte[] { b }, 0, 1); |
| | | int n = Integer.parseInt(str); |
| | | return n; |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * BCD编码转成整型,字节顺序是倒的 |
| | | * @param b |
| | | * @param startIndex |
| | | * @param endIndex |
| | | * @return |
| | | * @throws Exception |
| | | */ |
| | | public static int BCD2Int_LE(byte b) throws Exception { |
| | | String str = ""; |
| | | str = decodeBCD_LE(new byte[] { b }, 0, 1); |
| | | int n = Integer.parseInt(str); |
| | | return n; |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * BCD编码转成整型 |
| | | * @param b |
| | | * @param startIndex |
| | | * @param endIndex |
| | | * @return |
| | | * @throws Exception |
| | | */ |
| | | public static int BCD2Int_BE(byte[] b, int startIndex, int endIndex)throws Exception { |
| | | String str = ""; |
| | | str = decodeBCD_BE(b, startIndex, endIndex - startIndex + 1); |
| | | int n = Integer.parseInt(str); |
| | | return n; |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * BCD编码转成整型,字节顺序是倒的 |
| | | * @param b |
| | | * @param startIndex |
| | | * @param endIndex |
| | | * @return |
| | | * @throws Exception |
| | | */ |
| | | public static int BCD2Int_LE(byte[] b, int startIndex, int endIndex)throws Exception { |
| | | String str = ""; |
| | | str = decodeBCD_LE(b, startIndex, endIndex - startIndex + 1); |
| | | int n = Integer.parseInt(str); |
| | | return n; |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * BCD编码转成字符串型 |
| | | * @param b |
| | | * @param startIndex |
| | | * @param endIndex |
| | | * @return |
| | | * @throws Exception |
| | | */ |
| | | public static long BCD2Long_BE(byte[] b, int startIndex, int endIndex)throws Exception { |
| | | String str = ""; |
| | | str = decodeBCD_BE(b, startIndex, endIndex - startIndex + 1); |
| | | long n = Long.parseLong(str); |
| | | return n; |
| | | } |
| | | |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * BCD编码转成字符串型,字节顺序是倒的 |
| | | * @param b |
| | | * @param startIndex |
| | | * @param endIndex |
| | | * @return |
| | | * @throws Exception |
| | | */ |
| | | public static long BCD2Long_LE(byte[] b, int startIndex, int endIndex)throws Exception { |
| | | String str = ""; |
| | | str = decodeBCD_LE(b, startIndex, endIndex - startIndex + 1); |
| | | long n = Long.parseLong(str); |
| | | return n; |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * BCD编码转成字符串型 |
| | | * @param b |
| | | * @param startIndex |
| | | * @param endIndex |
| | | * @return |
| | | * @throws Exception |
| | | */ |
| | | public static String BCD2String_BE(byte[] b, int startIndex, int endIndex) throws Exception { |
| | | return decodeBCD_BE(b, startIndex, endIndex - startIndex + 1); |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * BCD编码转成字符串型,字节顺序是倒的 |
| | | * @param b |
| | | * @param startIndex |
| | | * @param endIndex |
| | | * @return |
| | | * @throws Exception |
| | | */ |
| | | public static String BCD2String_LE(byte[] b, int startIndex, int endIndex) throws Exception { |
| | | return decodeBCD_LE(b, startIndex, endIndex - startIndex + 1); |
| | | } |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * 编码BCD,例如1387编码成 13 87,顺序是正的 |
| | | * @param value |
| | | * @param dest |
| | | * @param startIndex |
| | | * @param length |
| | | */ |
| | | private static void encodeBCD_BE(String value, byte[] dest, int startIndex, int length)throws Exception { |
| | | if (value == null || !value.matches("\\d*")) { |
| | | throw new Exception("数字转成BCD编码时出错,不是合法数字:" + value, null); |
| | | } |
| | | |
| | | int[] tmpInts = new int[2 * length]; |
| | | int index = value.length() - 1; |
| | | for (int i = tmpInts.length - 1; i >= 0 && index >= 0; i--, index--) { |
| | | tmpInts[i] = value.charAt(index) - '0'; |
| | | } |
| | | for (int i = startIndex, j = 0; i < startIndex + length; i++, j++) { |
| | | dest[i] = (byte) (tmpInts[2 * j] * 16 + tmpInts[2 * j + 1]); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * 编码BCD,例如1387编码成 87 13,顺序是倒的 |
| | | * @param value |
| | | * @param dest |
| | | * @param startIndex |
| | | * @param length |
| | | */ |
| | | private static void encodeBCD_LE(String value, byte[] dest, int startIndex, int length)throws Exception { |
| | | if (value == null || !value.matches("\\d*")) { |
| | | throw new Exception("数字转成BCD编码时出错,不是合法数字:" + value, null); |
| | | } |
| | | |
| | | int[] tmpInts = new int[2 * length]; |
| | | int index = value.length() - 1; |
| | | for (int i = 0; i <= tmpInts.length - 1 && index >= 0; i++, index--) { |
| | | tmpInts[i] = value.charAt(index) - '0'; |
| | | } |
| | | for (int i = startIndex, j = 0; i < startIndex + length; i++, j++) { |
| | | dest[i] = (byte) (tmpInts[2 * j + 1] * 16 + tmpInts[2 * j] ); |
| | | } |
| | | } |
| | | |
| | | |
| | | |
| | | /** |
| | | * 大端模式《数据低位在数组高字节》 |
| | | * 解码BCD,顺序是正的 |
| | | * @param src |
| | | * @param startIndex |
| | | * @param length |
| | | * @return |
| | | */ |
| | | private static String decodeBCD_BE(byte[] src, int startIndex, int length)throws Exception { |
| | | StringBuilder sb = new StringBuilder(); |
| | | for (int i = startIndex; i < startIndex + length ; i++) { |
| | | int value = (src[i] + 256) % 256; |
| | | sb.append((char) (value / 16 + '0')).append((char) (value % 16 + '0')); |
| | | value++; |
| | | } |
| | | String result = sb.toString(); |
| | | if (!result.matches("\\d*")) { |
| | | throw new Exception("解码BCD,但数据(" + result + "[startIndex=" + startIndex + ",length=" + length + "])非BCD码!"); |
| | | } |
| | | return result; |
| | | } |
| | | |
| | | /** |
| | | * 小端模式《数据低位在数组低字节》 |
| | | * 编码BCD,顺序是倒的 |
| | | * @param src |
| | | * @param startIndex |
| | | * @param length |
| | | * @return |
| | | */ |
| | | private static String decodeBCD_LE(byte[] src, int startIndex, int length)throws Exception { |
| | | StringBuilder sb = new StringBuilder(); |
| | | for (int i = (startIndex + length - 1); i >= startIndex; i--) { |
| | | int value = (src[i] + 256) % 256; |
| | | sb.append((char) (value / 16 + '0')).append((char) (value % 16 + '0')); |
| | | } |
| | | |
| | | String result = sb.toString(); |
| | | if (!result.matches("\\d*")) { |
| | | throw new Exception("解码BCD,但数据(" + result + "[startIndex=" + startIndex + ",length=" + length + "])非BCD码!"); |
| | | } |
| | | return result; |
| | | } |
| | | |
| | | // public static void main(String[] args) throws Exception { |
| | | // // 帧头 + 帧长度 + 终端ID + 功能码 + 数据 |
| | | // int len = 2 + 4 + 4 + 2 + (4 + 4); |
| | | // |
| | | // byte[] b = new byte[len]; |
| | | // ByteUtil.int2Bytes(b, 1234567890, 0); |
| | | // int v1 = ByteUtil.bytes2Int(b, 0); |
| | | // System.out.println(v1); |
| | | // |
| | | // b = new byte[len]; |
| | | // ByteUtil.short2Bytes(b, (short) -1234, 0); |
| | | // short v2 = ByteUtil.bytes2Short(b, 0); |
| | | // System.out.println(v2); |
| | | // |
| | | // b = new byte[len]; |
| | | // ByteUtil.long2Bytes(b, 4638387438405602509L, 0); |
| | | // long v3 = ByteUtil.bytes2Long(b, 0); |
| | | // System.out.println(v3); |
| | | // |
| | | // b = new byte[len]; |
| | | // ByteUtil.float2Bytes(b, (float) -123456.45, 0); |
| | | // float v4 = ByteUtil.bytes2Float(b, 0); |
| | | // System.out.println(v4); |
| | | // |
| | | // b = new byte[len]; |
| | | // ByteUtil.double2Bytes(b, -256.1234567890123D, 0); |
| | | // double v5 = ByteUtil.bytes2Double(b, 0); |
| | | // System.out.println(v5); |
| | | // |
| | | // } |
| | | public static void main(String[] args) throws Exception { |
| | | byte[] bs = new byte[]{0x38, 0x36, 0x39, 0x31} ; |
| | | String s = bytes2String_BE(bs, 0, 3) ; |
| | | System.out.println(s); |
| | | |
| | | byte[] bss = new byte[]{(byte)0x8F} ; |
| | | int v = bss[0] ; |
| | | System.out.println(v); |
| | | if(v < 0){ |
| | | v = 255 + v + 1 ; |
| | | } |
| | | System.out.println(v); |
| | | } |
| | | |
| | | } |