java中数值转换的总结

来源：互联网发布：tcp 51 udp 端口编辑：程序博客网时间：2024/06/06 20:12
在与硬件交互时，需要将这种数值转成字节数据，按照某种协议进行传递，其中很重要的是数值和byte之间的转化。
public final class ModbusUtil {    /**     * 字节数组转十六进制字符串     *     * @param data     * @return     */    public static final String valueToHex(byte[] data) {        if (data == null) {            return "";        }        return valueToHex(data, 0, data.length);    }    /**     * 截取主要信息(包含子功能码)，不需要获取全部     *     * @param data     * @return     */    public static final String toSumaryHex(byte[] data) {        if (Utils.ifNeedCompLog()) {            if (data == null) {                return "";            }            return valueToHex(data, 0, data.length);        }        if (data == null) {            return "";        }        if (data.length < 8) {            return "data is not right";        }        String funcCode = ModbusUtil.valueToHex(new byte[]{data[7]});        switch (funcCode) {            case "41":            case "83":            case "86":            case "c1":                return valueToHex(data, 7, 9);            default:                return valueToHex(data, 7, 8);        }    }    /**     * 字节数组转十六进制字符串     *     * @param data     * @param off     * @param length     * @return     */    public static final String valueToHex(byte[] data, int off, int length) {        StringBuffer stringBuffer = new StringBuffer(data.length * 2);        for (int i = off; i < length; i++) {            if (((int) data[i] & 0xff) < 0x10) {                stringBuffer.append("0");            }            stringBuffer.append(Long.toString((int) data[i] & 0xff, 16));            if (i < data.length - 1) {                stringBuffer.append(" ");            }        }        return stringBuffer.toString();    }    public static final int hexStrToInt(String hexStr) {        if (TextUtils.isEmpty(hexStr)) {            return -1;        }        String result = hexStr.substring(2);        return Integer.parseInt(result, 16);    }    /**     * 整型转换十六进制数组     *     * @param i     * @return     */    public static final byte[] valueToHex(int i) {        StringBuffer stringBuffer = new StringBuffer(2);        if ((i & 0xff) < 0x10) {            stringBuffer.append("0");        }        stringBuffer.append(Long.toString(i & 0xff, 16).toUpperCase());        return stringBuffer.toString().getBytes(Charset.defaultCharset());    }    /**     * 字节数组转无符号Short     *     * @param bytes     * @return     */    public static final int regToUnsignedShort(byte[] bytes) {        if (bytes == null) {            return -1;        }        return ((bytes[0] & 0xff) << 8 | (bytes[1] & 0xff));    }    public static final int regToUnsignedShort(byte one, byte two) {        return ((one & 0xff) << 8 | (two & 0xff));    }    /**     * 无符号short转字节数组     *     * @param v     * @return     */    public static final byte[] unsignedShortToReg(int v) {        byte[] regs = new byte[2];        regs[0] = (byte) (0xff & (v >> 8));        regs[1] = (byte) (0xff & v);        return regs;    }    /**     * 字节数组转short     *     * @param bytes     * @return     */    public static final short regToShort(byte[] bytes) {        if (bytes == null) {            return 0;        }        return (short) ((bytes[0] << 8) | (bytes[1] & 0xff));    }    /**     * 字节数组转short     *     * @param bytes     * @return     */    public static final short regToShort(byte[] bytes, int idx) {        return (short) ((bytes[idx] << 8) | (bytes[idx + 1] & 0xff));    }    /**     * short转字节数组     *     * @param s     * @return     */    public static final byte[] shortToReg(short s) {        byte[] regs = new byte[2];        regs[0] = (byte) (0xff & (s >> 8));        regs[1] = (byte) (0xff & s);        return regs;    }    /**     * 字节数组转int     *     * @param bytes     * @return     */    public static final int regToInt(byte[] bytes) {        if (bytes == null || bytes.length != 4) {            return 0;        }        return (((bytes[0] & 0xff) << 24) | ((bytes[1] & 0xff) << 16)                | ((bytes[2] & 0xff) << 8) | (bytes[3] & 0xff));    }    /**     * 字节数组低位转int     *     * @param bytes     * @return     */    public static final int regToIntByLittle(byte[] bytes) {        return ((bytes[0] & 0xff) | ((bytes[1] & 0xff) << 8)                | ((bytes[2] & 0xff) << 16) | (bytes[3] & 0xff) << 24);    }    /**     * 小端字节数组解析     */    public static short bytesToShortByLittle(byte[] bytes, int idx) {        if (bytes == null) {            return 0;        }        return (short) (((bytes[idx + 1] & 0xff) << 8) | (bytes[idx] & 0xff));    }    /**     * 将byte转成无符号的值对应的int     *     * @param value     * @return     */    public static final int byteToUnsignedInt(byte value) {        return (int) (value & 0xFF);    }    /**     * int转字节数组     *     * @param v     * @return     */    public static final byte[] intToReg(int v) {        byte[] regs = new byte[4];        regs[0] = (byte) (0xff & (v >> 24));        regs[1] = (byte) (0xff & (v >> 16));        regs[2] = (byte) (0xff & (v >> 8));        regs[3] = (byte) (0xff & v);        return regs;    }    /**     * 字节数组转long     *     * @param bytes     * @return     */    public static final long regToLong(byte[] bytes) {        return ((((long) (bytes[0] & 0xff) << 56)                | ((long) (bytes[1] & 0xff) << 48)                | ((long) (bytes[2] & 0xff) << 40)                | ((long) (bytes[3] & 0xff) << 32)                | ((long) (bytes[4] & 0xff) << 24)                | ((long) (bytes[5] & 0xff) << 16)                | ((long) (bytes[6] & 0xff) << 8) | ((long) (bytes[7] & 0xff))));    }    /**     * long转字节数组     *     * @param v     * @return     */    public static final byte[] longToReg(long v) {        byte[] regs = new byte[8];        regs[0] = (byte) (0xff & (v >> 56));        regs[1] = (byte) (0xff & (v >> 48));        regs[2] = (byte) (0xff & (v >> 40));        regs[3] = (byte) (0xff & (v >> 32));        regs[4] = (byte) (0xff & (v >> 24));        regs[5] = (byte) (0xff & (v >> 16));        regs[6] = (byte) (0xff & (v >> 8));        regs[7] = (byte) (0xff & v);        return regs;    }    /**     * 字节数组转float     *     * @param bytes     * @return     */    public static final float regToFloat(byte[] bytes) {        return Float                .intBitsToFloat((((bytes[0] & 0xff) << 24)                        | ((bytes[1] & 0xff) << 16) | ((bytes[2] & 0xff) << 8) | (bytes[3] & 0xff)));    }    /**     * float转字节数组     *     * @param f     * @return     */    public static final byte[] floatToReg(float f) {        return intToReg(Float.floatToIntBits(f));    }    /**     * 字节数组转double     *     * @param bytes     * @return     */    public static final double regToDouble(byte[] bytes) {        return Double                .longBitsToDouble(((((long) (bytes[0] & 0xff) << 56)                        | ((long) (bytes[1] & 0xff) << 48)                        | ((long) (bytes[2] & 0xff) << 40)                        | ((long) (bytes[3] & 0xff) << 32)                        | ((long) (bytes[4] & 0xff) << 24)                        | ((long) (bytes[5] & 0xff) << 16)                        | ((long) (bytes[6] & 0xff) << 8) | ((long) (bytes[7] & 0xff)))));    }    /**     * double转字节数组     *     * @param d     * @return     */    public static final byte[] doubleToReg(double d) {        return longToReg(Double.doubleToLongBits(d));    }    /**     * byte转int     *     * @param b     * @return     */    public static final int unsignedByteToInt(byte b) {        return (int) b & 0xFF;    }// unsignedByteToInt}
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