标签:short Java bytes System 互转 new byte ByteUtils out
示例
long
类型的变量与 byte
数组互转:
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
public class ByteUtilsTests {
public static void main(String[] args) throws IOException {
long currentTimeMillis = System.currentTimeMillis();
System.out.println(currentTimeMillis);
// long 类型变量转 byte 数组
ByteArrayOutputStream baos = new ByteArrayOutputStream(Long.BYTES);
new DataOutputStream(baos).writeLong(currentTimeMillis);
byte[] bytes = baos.toByteArray();
// byte 数组转 long 类型变量
long number = new DataInputStream(new ByteArrayInputStream(bytes)).readLong();
System.out.println(number);
}
}
输出:
1610638668277
1610638668277
工具类
将其封装成工具类:
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
public class ByteUtils {
public static byte[] toByteArray(short number) throws IOException {
byte[] bytes = new byte[Short.BYTES];
bytes[0] = (byte) (number >> 8);
bytes[1] = (byte) number;
return bytes;
}
public static byte[] toByteArray(int number) throws IOException {
byte length = Integer.BYTES;
byte[] bytes = new byte[length];
for (byte i = 0; i < length; i++) {
bytes[length - 1 - i] = (byte) number;
number >>= 8;
}
return bytes;
}
public static byte[] toByteArray(long number) throws IOException {
byte length = Long.BYTES;
byte[] bytes = new byte[length];
for (byte i = 0; i < length; i++) {
bytes[length - 1 - i] = (byte) number;
number >>= 8;
}
return bytes;
// ByteArrayOutputStream baos = new ByteArrayOutputStream(length);
// new DataOutputStream(baos).writeLong(number);
// return baos.toByteArray();
}
public static short toShort(byte[] bytes) throws IOException {
return new DataInputStream(new ByteArrayInputStream(bytes)).readShort();
}
public static int toInteger(byte[] bytes) throws IOException {
return new DataInputStream(new ByteArrayInputStream(bytes)).readInt();
}
public static long toLong(byte[] bytes) throws IOException {
return new DataInputStream(new ByteArrayInputStream(bytes)).readLong();
}
}
测试:
import java.io.IOException;
import com.mk.util.ByteUtils;
public class ByteUtilsTests {
public static void main(String[] args) throws IOException {
byte[] bytes = null;
bytes = ByteUtils.toByteArray((short) 0xF123); // 负数
System.out.println((short) 0xF123);
System.out.println(ByteUtils.toShort(bytes));
bytes = ByteUtils.toByteArray((short) 0x1234); // 正数
System.out.println((short) 0x1234);
System.out.println(ByteUtils.toShort(bytes));
bytes = ByteUtils.toByteArray(0xF1234567);
System.out.println(0xF1234567);
System.out.println(ByteUtils.toInteger(bytes));
bytes = ByteUtils.toByteArray(0x12345678);
System.out.println(0x12345678);
System.out.println(ByteUtils.toInteger(bytes));
bytes = ByteUtils.toByteArray(0xF123456789ABCDEFL);
System.out.println(0xF123456789ABCDEFL);
System.out.println(ByteUtils.toLong(bytes));
bytes = ByteUtils.toByteArray(0x123456789ABCDEF0L);
System.out.println(0x123456789ABCDEF0L);
System.out.println(ByteUtils.toLong(bytes));
}
}
输出:
-3805
-3805
4660
4660
-249346713
-249346713
305419896
305419896
-1070935975390360081
-1070935975390360081
1311768467463790320
1311768467463790320
标签:short,Java,bytes,System,互转,new,byte,ByteUtils,out 来源: https://blog.csdn.net/qq_29761395/article/details/112645304
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