java 16进制浮点数转十进制

/**
* 处理4个字节带小数的浮点数
* Created by wuhaowei([e-mail])
* @DATE:2011-10-16 下午08:52:24
*
* @param b
* @return
*/
public static float byte2int_Float(byte b[]) {
int bits = b[3] & 0xff | (b[2] & 0xff) << 8 | (b[1] & 0xff) << 16
| (b[0] & 0xff) << 24;

int sign = ((bits & 0x80000000) == 0) ? 1 : -1;
int exponent = ((bits & 0x7f800000) >> 23);
int mantissa = (bits & 0x007fffff);

mantissa |= 0x00800000;
// Calculate the result:
float f = (float) (sign * mantissa * Math.pow(2, exponent - 150));

return f;
}