文章目錄
最近需要用到这个功能,本来想自己写,怕写错了,上网找了一下,都没找到合适的。看了solr与源码中的TrieField.java,有这一部分的代码,copy到这里。
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| public class ByteUtil { public static int toInt(byte[] arr) { return (arr[0] << 24) | ((arr[1] & 0xff) << 16) | ((arr[2] & 0xff) << 8) | (arr[3] & 0xff); }
public static long toLong(byte[] arr) { int high = (arr[0] << 24) | ((arr[1] & 0xff) << 16) | ((arr[2] & 0xff) << 8) | (arr[3] & 0xff); int low = (arr[4] << 24) | ((arr[5] & 0xff) << 16) | ((arr[6] & 0xff) << 8) | (arr[7] & 0xff); return (((long) high) << 32) | (low & 0x0ffffffffL); }
public static float toFloat(byte[] arr) { return Float.intBitsToFloat(toInt(arr)); }
public static double toDouble(byte[] arr) { return Double.longBitsToDouble(toLong(arr)); }
public static byte[] toArr(int val) { byte[] arr = new byte[4]; arr[0] = (byte) (val >>> 24); arr[1] = (byte) (val >>> 16); arr[2] = (byte) (val >>> 8); arr[3] = (byte) (val); return arr; }
public static byte[] toArr(long val) { byte[] arr = new byte[8]; arr[0] = (byte) (val >>> 56); arr[1] = (byte) (val >>> 48); arr[2] = (byte) (val >>> 40); arr[3] = (byte) (val >>> 32); arr[4] = (byte) (val >>> 24); arr[5] = (byte) (val >>> 16); arr[6] = (byte) (val >>> 8); arr[7] = (byte) (val); return arr; }
public static byte[] toArr(float val) { return toArr(Float.floatToRawIntBits(val)); }
public static byte[] toArr(double val) { return toArr(Double.doubleToRawLongBits(val)); } }
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