常用数据类型转换

/**
* switch IP Address
* 
* @param int
* @return String
*/
public String intToIp(int i) {
return (i & 0xFF) + "." + ((i >> 8) & 0xFF) + "." + ((i >> 16) & 0xFF)
+ "." + (i >> 24 & 0xFF);
}


/**
* bytes[] to hexString
* 
* @param bytes[]
* @return String(Hex)
*/
public String toHexString(byte[] bytes) {
String hexSSID = "";
for (int i = 0; i < bytes.length; i++) {
String hex = Integer.toHexString(bytes[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
hexSSID = hexSSID + hex;
}


return hexSSID;
}

/**
*short to byte[]
* 
* @param short
* @return byte[]
*/
public static byte[] getBytes(short data){
byte[] bytes = new byte[2];
        bytes[0] = (byte) (data & 0xff);
                bytes[1] = (byte) ((data & 0xff00) >> 8);
                return bytes;
        }


/**
*char to byte[]
* 
* @param char
* @return byte[]
*/
    public static byte[] getBytes(char data){
        byte[] bytes = new byte[2];
        bytes[0] = (byte) (data);
        bytes[1] = (byte) (data >> 8);
        return bytes;
    }


/**
*int to byte[]
* 
* @param int
* @return byte[]
*/
    public static byte[] getBytes(int data){
        byte[] bytes = new byte[4];
        bytes[0] = (byte) (data & 0xff);
        bytes[1] = (byte) ((data & 0xff00) >> 8);
        bytes[2] = (byte) ((data & 0xff0000) >> 16);
        bytes[3] = (byte) ((data & 0xff000000) >> 24);
        return bytes;
    }


/**
*long to byte[]
* 
* @param long
* @return byte[]
*/
public static byte[] getBytes(long data){
        byte[] bytes = new byte[8];
        bytes[0] = (byte) (data & 0xff);
        bytes[1] = (byte) ((data >> 8) & 0xff);
        bytes[2] = (byte) ((data >> 16) & 0xff);
        bytes[3] = (byte) ((data >> 24) & 0xff);
        bytes[4] = (byte) ((data >> 32) & 0xff);
        bytes[5] = (byte) ((data >> 40) & 0xff);
        bytes[6] = (byte) ((data >> 48) & 0xff);
        bytes[7] = (byte) ((data >> 56) & 0xff);
        return bytes;
    }


/**
*float to byte[]
* 
* @param float
* @return byte[]
*/
    public static byte[] getBytes(float data){
        int intBits = Float.floatToIntBits(data);
        return getBytes(intBits);
    }


/**
*double to byte[]
* 
* @param double
* @return byte[]
*/
    public static byte[] getBytes(double data){
        long intBits = Double.doubleToLongBits(data);
        return getBytes(intBits);
    }




/**
*double to byte[]
* 
* @param string,string(编码格式)
* @return byte[]
*/
    public static byte[] getBytes(String data, String charsetName){
        Charset charset = Charset.forName(charsetName);
        return data.getBytes(charset);
    }


    /**
*byte[] to short
* 
* @param byte[]
* @return short
*/
    public static short getShort(byte[] bytes){
        return (short) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));
    }


/**
*byte[] to char
* 
* @param byte[]
* @return char
*/
    public static char getChar(byte[] bytes){
        return (char) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));
    }


/**
*byte[] to int
* 
* @param byte[]
* @return int
*/
    public static int getInt(byte[] bytes){
        return (0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)) | (0xff0000 & (bytes[2] << 16)) | (0xff000000 & (bytes[3] << 24));
    }
   
    /**
*byte[] to long
* 
* @param byte[]
* @return long
*/
    public static long getLong(byte[] bytes){
        return(0xffL & (long)bytes[0]) | (0xff00L & ((long)bytes[1] << 8)) | (0xff0000L & ((long)bytes[2] << 16)) | (0xff000000L & ((long)bytes[3] << 24))
         | (0xff00000000L & ((long)bytes[4] << 32)) | (0xff0000000000L & ((long)bytes[5] << 40)) | (0xff000000000000L & ((long)bytes[6] << 48)) | (0xff00000000000000L & ((long)bytes[7] << 56));
    }




/**
*byte[] to float
* 
* @param byte[]
* @return float
*/
    public static float getFloat(byte[] bytes){
        return Float.intBitsToFloat(getInt(bytes));
    }


/**
*byte[] to double
* 
* @param byte[]
* @return double
*/
    public static double getDouble(byte[] bytes){
        long l = getLong(bytes);
        System.out.println(l);
        return Double.longBitsToDouble(l);
    }


/**
*byte[] to string
* 
* @param byte[],string(编码格式)
* @return string
*/
    public static String getString(byte[] bytes, String charsetName){
        return new String(bytes, Charset.forName(charsetName));
    }