java unicode to utf-8
package test.wingware;public class UnicodeToUTF8 {private static final int MASKBITS = 0x3F;private static final int MASKBYTE = 0x80;private static final int MASK2BYTES = 0xC0;private static final int MASK3BYTES = 0xE0;// private static final int MASK4BYTES = 0xF0;// private static final int MASK5BYTES = 0xF8;// private static final int MASK6BYTES = 0xFC;/** *//** * @功能: 将UNICODE（UTF-16LE）编码转成UTF-8编码 * @参数: byte[] b 源字节数组 * @返回值: byte[] b 转为UTF-8编码后的数组 * @作者: imuse */public static byte[] UNICODE_TO_UTF8(byte[] b) {int i = 0;int j = 0;byte[] utf8Byte = new byte[b.length * 2];while (i < b.length) {byte[] bUTF = new byte[1];int nCode = (b[i] & 0xFF) | ((b[i + 1] & 0xFF) << 8);if (nCode < 0x80) {bUTF = new byte[1];bUTF[0] = (byte) nCode;}// 110xxxxx 10xxxxxxelse if (nCode < 0x800) {bUTF = new byte[2];bUTF[0] = (byte) (MASK2BYTES | nCode >> 6);bUTF[1] = (byte) (MASKBYTE | nCode & MASKBITS);}// 1110xxxx 10xxxxxx 10xxxxxxelse if (nCode < 0x10000) {bUTF = new byte[3];bUTF[0] = (byte) (MASK3BYTES | nCode >> 12);bUTF[1] = (byte) (MASKBYTE | nCode >> 6 & MASKBITS);bUTF[2] = (byte) (MASKBYTE | nCode & MASKBITS);}for (int k = 0; k < bUTF.length; k++) {utf8Byte[j++] = bUTF[k];}i += 2;}b = new byte[j];System.arraycopy(utf8Byte, 0, b, 0, j);return b;}/** *//** * @功能: 将一个长度为2 byte数组转为short * @参数: byte[] bytesShort要转的字节数组 * @返回值: short sRet 转后的short值 */public static short bytesToShort(byte[] bytesShort) {short sRet = 0;sRet += (bytesShort[0] & 0xFF) << 8;sRet += bytesShort[1] & 0xFF;return sRet;}/** *//** * @功能: 将一个short值转为byte数组 * @参数: short sNum 要转的short值 * @返回值: byte[] bytesRet 转后的byte数组 */public static byte[] shortToBytes(short sNum) {byte[] bytesRet = new byte[2];bytesRet[0] = (byte) ((sNum >> 8) & 0xFF);bytesRet[1] = (byte) (sNum & 0xFF);return bytesRet;}/** *//** * @功能: 将一个长度为4 byte数组转为int * @参数: byte[] bNum要转的字节数组 * @返回值: int retInt 转后的int值 */public static int bytesToInt(byte[] bNum) {int retInt = 0;retInt = ((bNum[0] & 0xFF) << 24);retInt += (bNum[1] & 0xFF) << 16;retInt += (bNum[2] & 0xFF) << 8;retInt += bNum[3] & 0xFF;return retInt;}/** *//** * @功能: 将一个int值转为byte数组 * @参数: int nNum 要转的int值 * @返回值: byte[] bytesRet 转后的byte数组 */public static byte[] intToBytes(int nNum) {byte[] bytesRet = new byte[4];bytesRet[0] = (byte) ((nNum >> 24) & 0xFF);bytesRet[1] = (byte) ((nNum >> 16) & 0xFF);bytesRet[2] = (byte) ((nNum >> 8) & 0xFF);bytesRet[3] = (byte) (nNum & 0xFF);return bytesRet;}}