java中将byte数组转换成float或double的值

本是古典何须时尚 2022-10-16 04:46 237阅读 0赞

import java.util.ArrayList;
    import java.util.List;
    
    /**
     * @Author: 
     * @Date: 
     * @Description: 进行数据转换的工具类
     */
    public class WaveDataCalcUtil { 
    
        /**
         * 将byte类型的arr转换成float
         * @return
         */
        public static List<Float> byteArrayToFloatList(byte[] bytes){ 
            List<Float> d = new ArrayList<>(bytes.length/8);
            byte[] doubleBuffer = new byte[4];
            for(int j = 0; j < bytes.length; j += 4) { 
                System.arraycopy(bytes, j, doubleBuffer, 0, doubleBuffer.length);
                d.add(bytes2Float(doubleBuffer));
            }
            return d;
        }
    
        /**
         * 将byte类型的arr转换成double
         * @param arr
         * @return
         */
        public static List<Double> byteArrayToDoubleList(byte[] arr){ 
            List<Double> d = new ArrayList<>(arr.length/8);
            byte[] doubleBuffer = new byte[8];
            for(int j = 0; j < arr.length; j += 8) { 
                System.arraycopy(arr, j, doubleBuffer, 0, doubleBuffer.length);
                d.add(bytes2Double(doubleBuffer));
            }
            return d;
        }
    
        /**
         * 将byte数组数据转换成float
         * @param arr
         * @return
         */
        public static float bytes2Float(byte[] arr) { 
            int accum = 0;
            accum = accum|(arr[0] & 0xff) << 0;
            accum = accum|(arr[1] & 0xff) << 8;
            accum = accum|(arr[2] & 0xff) << 16;
            accum = accum|(arr[3] & 0xff) << 24;
            return Float.intBitsToFloat(accum);
        }
    
        /**
         * 将byte转换成double
         * @param arr
         * @return
         */
        public static double bytes2Double(byte[] arr) { 
            long value = 0;
            for (int i = 0; i < 8; i++) { 
                value |= ((long) (arr[i] & 0xff)) << (8 * i);
            }
            return Double.longBitsToDouble(value);
        }
    }