Java协议字节操作工具类详情
作者：何忆清风
这篇文章主要介绍了Java协议字节操作工具类详情，文章围绕主题展开详细的内容介绍，具有一定的参考价值，需要的小伙伴可以参考一下
前言：
由于最近有解析协议的一些业务场景，需要用到一些字节操作工具，这里封装了一些比较常用的转换方法，测试后基本没有问题，可能一些比较偏门的数据会出现数据转换错误
- int与数组相互转换
- short与数组想换转换
- 获取int指定位的数据
- 获取int指定范围的位数据
- 对象转换数组，数组转换对象
public class AppTest {
/**
* Rigorous Test :-)
*/
@Test
public void shouldAnswerWithTrue() {
int hex = 16;
System.out.println("获取16进制字符串数据:" + BitOperator.intToHexString(hex, 2));
System.out.println("获取int类型0-8位的位数据:" + BitOperator.intNumberRightBitRangeOperator(999, 0, 8));
System.out.println("获取int类型9-10位的位数据：" + BitOperator.intNumberRightBitRangeOperator(999, 8, 10));
System.out.println("获取int类型10-12位的位数据：" + BitOperator.intNumberRightBitRangeOperator(256, 10, 12));
short value = 256;
System.out.println("获取short类型10-12位的位数据：" + BitOperator.shortNumberRightBitRangeOperator(value, 8, 12));
//序列化与反序列化对象
byte[] bytes = BitOperator.objToBytes(new A());
A object = (A) BitOperator.bytesToObject(bytes);
System.out.println(object);
//转换int数据
int intV = 12738123;
byte[] bytes1 = {
(byte) ((intV >> 24) & 0xff),
(byte) ((intV >> 16) & 0xff),
(byte) ((intV >> 8) & 0xff),
(byte) (intV & 0xff)
};
byte[] bytes2 = BitOperator.intNumberToBytes(intV);
int intNumber = BitOperator.bytesToIntNumber(bytes2);
//转换short类型
short sv = 999;
byte[] bytes3 = {
(byte) ((sv >> 8) & 0xff),
(byte) (sv & 0xff)
};
short i = BitOperator.bytesToShortNumber(bytes3);
System.out.println(i);
}
@ToString
public static class A implements Serializable {
public String name = "zs";
}
}@SuppressWarnings("all")
public class BitOperator {
/** DIGITAL */
public static final String DIGITAL = "0123456789ABCDEF";
/** 16进制表示符 */
public static final String HEX = "0x";
/**
* 数组转换成 int类型
*
* @param value value
* @return the byte [ ]
* @since 1.0
*/
public static byte[] intNumberToBytes(int value) {
return new byte[] {
byteNumberRightBitRangeOperator(value, 24, 32),
byteNumberRightBitRangeOperator(value, 16, 24),
byteNumberRightBitRangeOperator(value, 8, 16),
byteNumberRightBitRangeOperator(value, 0, 8)
};
}
/**
* Short number to bytes
*
* @param value value
* @return the byte [ ]
* @since 1.0
*/
public static byte[] shortNumberToBytes(short value) {
return new byte[] {
(byte) shortNumberRightBitRangeOperator(value, 8, 16),
(byte) shortNumberRightBitRangeOperator(value, 0, 8)
};
}
/**
* 数组转换成int数据
*
* @param bytes bytes
* @return the int
* @since 1.0
*/
public static int bytesToIntNumber(byte[] bytes) {
return bytesToNumberValue(bytes,0, (res, value) -> {
return value | res;
});
}
/**
* 将数组转换成short类型
*
* @param bytes bytes
* @return the int
* @since 1.0
*/
public static short bytesToShortNumber(byte[] bytes) {
return bytesToNumberValue(bytes, (short) 0, (res, value) -> {
return (short) (res | value);
});
}
/**
* Bytes to number value
*
* @param <T> parameter
* @param bytes bytes
* @param value value
* @param function function
* @return the t
* @since 1.0
*/
public static <T extends Number> T bytesToNumberValue(byte[] bytes,
T value,
BiFunction<Integer, T, T> function) {
try {
int tmp = bytes.length * 8;
for (int i = 0; i < bytes.length; i++) {
tmp -= 8;
value = function.apply(((bytes[i] & 0xff) << tmp), value);
}
} catch (Exception e) {
e.printStackTrace();
}
return value;
}
/**
* 16进制字符串转换为字节数组
*
* @param str str
* @return the byte [ ]
* @since 1.0
*/
public static byte[] hexStringToByteArray(String str) {
int len = str.length();
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(str.charAt(i), 16) << 4)
+ Character.digit(str.charAt(i + 1), 16));
}
return data;
}
/**
* 字节数组转换为16进制字符串
*
* @param src src
* @return string string
* @since 2022.1.1
*/
public static String bytesArrayToHexString(byte[] src) {
StringBuilder stringBuilder = new StringBuilder();
if (src == null || src.length <= 0) {
return null;
}
for (byte b : src) {
int v = b & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2) {
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
return stringBuilder.toString();
}
/**
* 16进制字符串转换为字节数组
*
* @param hex hex
* @return byte [ ]
* @since 1.0
*/
public static byte[] stringToBytes(String hex) {
String hex1 = hex.replace(" ", "");
char[] hex2char = hex1.toCharArray();
byte[] bytes = new byte[hex1.length() / 2];
byte temp;
for (int p = 0; p < bytes.length; p++) {
temp = (byte) (DIGITAL.indexOf(hex2char[2 * p]) * 16);
temp += DIGITAL.indexOf(hex2char[2 * p + 1]);
bytes[p] = (byte) (temp & 0xff);
}
return bytes;
}
/**
* string字符串转换为 16进制字符串
*
* @param hex hex
* @return the string
* @since 1.0
*/
public static String stringToHexString(String s) {
StringBuilder str = new StringBuilder();
for (int i = 0; i < s.length(); i++) {
int ch = (int) s.charAt(i);
String s4 = Integer.toHexString(ch);
str.append(s4);
}
return HEX + str.toString();
}
/**
* int类型转换为16进制字符串
*
* @param value value
* @param number 不足指定位数补零
* @return the string
* @since 1.0
*/
public static String intToHexString(int value, int number) {
return numberValueToHexString(value, number, true);
}
/**
* long类型转换为16进制字符串
*
* @param value value
* @param number number
* @return the string
* @since 1.0
*/
public static String longToHexString(long value, int number) {
return numberValueToHexString(value, number, true);
}
/**
* 数字类型类型转换为16进制字符串
*
* @param value value
* @param number number
* @param isShowHex 是否拼接Ox
* @return the string
* @since 1.0
*/
public static String numberValueToHexString(Object value, int number, boolean isShowHex) {
if (number <= 0) {
number = 2;
}
String hex = String.format("%0" + number + "x", value);
return isShowHex ? HEX + hex : hex;
}
/**
* 获取指定位的位数据
*
* @param value value
* @param bitNumber bit number
* @return the int
* @since 1.0
*/
public static int intNumberRightBitOperator(int value, int bitNumber) {
return bitNumberOperator(32, bitNumber, str -> str != null ? ((value & Integer.parseUnsignedInt(str, 2)) >> bitNumber) : 0);
}
/**
* 获取Long类型指定位数的数据
*
* @param value value
* @param bitNumber bit number
* @return the int
* @since 1.0
*/
public static Long longNumberRightBitOperator(long value, int bitNumber) {
return bitNumberOperator(64, bitNumber, str -> str != null ? ((value & Long.parseUnsignedLong(str, 2)) >> bitNumber) : 0);
}
/**
* 获取指定位的数据
*
* @param <T> parameter
* @param valueBit 数据类型的长度，例如int：32位
* @param number 表示取多少位的数据
* @param func func
* @return the int
* @since 1.0
*/
public static <T> T bitNumberOperator(int valueBit, int number, Function<String, T> func) {
if (number > valueBit) {
return (T) new Integer(0);
}
//获取到位的长度，根据长度生成对应的二进制位数据，获取数据需要生成 1
StringBuilder builder = new StringBuilder();
number = valueBit - number;
for (int i = 0; i < valueBit; i++) {
if (i == number) {
builder.append("1");
} else {
builder.append("0");
}
}
return func.apply(builder.toString());
}
/**
* 获取int类型数据指定范围的数据
*
* @param value value
* @param start start
* @param end end
* @return the int
* @since 1.0
*/
public static int intNumberRightBitRangeOperator(int value, int start, int end) {
return bitNumberRangeOperator(start, end, 32, str -> str != null ? ((value & Integer.parseUnsignedInt(str, 2)) >> start) : 0);
}
/**
* 获取int类型数据指定范围的数据
*
* @param value value
* @param start start
* @param end end
* @return the int
* @since 1.0
*/
public static byte byteNumberRightBitRangeOperator(int value, int start, int end) {
return (byte) intNumberRightBitRangeOperator(value, start, end);
}
/**
* 获取short类型指定范围位数的数据
*
* @param value value
* @param start start
* @param end end
* @return the int
* @since 1.0
*/
public static short shortNumberRightBitRangeOperator(short value, int start, int end) {
return bitNumberRangeOperator(start, end, 16, str -> (short) (str != null ? ((value & Short.parseShort(str, 2)) >> start) : 0));
}
/**
* 获取指定位的数据
*
* @param <T> parameter
* @param start start
* @param end end
* @param typeLength type length
* @param func func
* @return the int
* @since 1.0
*/
public static <T> T bitNumberRangeOperator(int start, int end, int typeLength, Function<String, T> func) {
if (start > end) {
return (T) new Integer(0);
}
//获取到位的长度，根据长度生成对应的二进制位数据，获取数据需要生成 1
StringBuilder builder = new StringBuilder();
for (int i = typeLength - 1; i >= 0; i--) {
if (i >= start && i < end) {
builder.append("1");
} else {
builder.append("0");
}
}
return func.apply(builder.toString());
}
/**
* obj对象转换为字节数组
*
* @param obj obj
* @return the string
* @since 1.0
*/
public static byte[] objToBytes(Object obj) {
ByteArrayOutputStream objByteArray = new ByteArrayOutputStream();
byte[] result;
try (ObjectOutputStream objectOutputStream = new ObjectOutputStream(objByteArray);) {
objectOutputStream.writeObject(obj);
objectOutputStream.flush();
objectOutputStream.close();
result = objByteArray.toByteArray();
} catch (IOException e) {
throw new RuntimeException("对象数据转换异常:" + e.getMessage());
}
return result;
}
/**
* 反序列化对象
*
* @param bytes bytes
* @return the object
* @since 1.0
*/
public static Object bytesToObject(byte[] bytes) {
ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(bytes);
Object result = null;
try(ObjectInputStream objectInputStream = new ObjectInputStream(arrayInputStream);) {
result = objectInputStream.readObject();
} catch (IOException | ClassNotFoundException e) {
e.printStackTrace();
}
return result;
}
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