java位操作

public class ByteConvert {


public static byte[] stringToByte(String inputString) {
int strLen = inputString.length();
char[] charResult = new char[strLen];
byte[] byteResult = new byte[strLen];

for (int i = 0; i < strLen; i++) {
charResult[i] = inputString.charAt(i);
byteResult[i] = (byte) charResult[i];
}
return byteResult;
}
/**
* 将int型转为byte[]，高位byte存储高位
* @param int inputNum
* @return byte[]
*/
public static byte[] intToByte(int inputNum) {

int count = 0;
if (inputNum < (Math.pow(2, 8)))
count = 1;
else if (inputNum < (Math.pow(2, 16)))
count = 2;
else if (inputNum < (Math.pow(2, 24)))
count = 3;
else if (inputNum < (Math.pow(2, 32)))
count = 4;
byte[] byteResult = new byte[count];
for (int i = 0; i < count; i++) {
byteResult[i] = (byte) ((inputNum >> (8 * i)) & 0xff);
}
return byteResult;

}
/**
* 将byte[]转为int，高位byte存储的是高位，从高位开始解析
* @param inputByte
* @return int
*/
public static int byteToInt(byte[] inputByte) {
int count = inputByte.length;

int result = 0;
for (int i = count - 1; i >= 0; i--) {
if (inputByte[i] < 0) {
int temp = 0;
temp = 256 + inputByte[i];
result = (result << 8) + temp;
} else {
result = (result << 8) + inputByte[i];
}
}
return result;
}
/**
* 将byte[]转为string
* @param inputByte
* @return String
*/
public static String byteToString(byte[] inputByte){
int len=inputByte.length;
String result="";
for(int i=0;i<len;i++){
result=result+(char)inputByte[i];
}
return result;
}
}