JAVA_Unicod转换成UTF-8

private static final int MASKBITS = 0x3F;
private static final int MASKBYTE = 0x80;
private static final int MASK2BYTES = 0xC0;
private static final int MASK3BYTES = 0xE0;
/** *//**
* @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
* @author: leo
* @MAIL: postzhu@https://www.wendangku.net/doc/c315907068.html,
*/
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 10xxxxxx
else if (nCode < 0x800)
{
bUTF = new byte[2];
bUTF[0] = (byte) (MASK2BYTES | nCode >> 6);
bUTF[1] = (byte) (MASKBYTE | nCode & MASKBITS);
}
// 1110xxxx 10xxxxxx 10xxxxxx
else 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);
byt

esRet[3] = (byte) (nNum & 0xFF);
return bytesRet;
}