Java基本类型与byte数组之间相互转换
package com.my.wxf4j.utils;
import
java.nio.charset.Charset;
public
class
ByteUtil
{
public
static
byte
[] getBytes(
short
data)
{
byte
[] bytes =
new
byte
[2];
bytes[0] = (
byte
) (data & 0xff);
bytes[1] = (
byte
) ((data & 0xff00) >> 8);
return
bytes;
}
public
static
byte
[] getBytes(
char
data)
{
byte
[] bytes =
new
byte
[2];
bytes[0] = (
byte
) (data);
bytes[1] = (
byte
) (data >> 8);
return
bytes;
}
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;
}
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;
}
public
static
byte
[] getBytes(
float
data)
{
int
intBits = Float.floatToIntBits(data);
return
getBytes(intBits);
}
public
static
byte
[] getBytes(
double
data)
{
long
intBits = Double.doubleToLongBits(data);
return
getBytes(intBits);
}
public
static
byte
[] getBytes(String data, String charsetName)
{
Charset charset = Charset.forName(charsetName);
return
data.getBytes(charset);
}
public
static
byte
[] getBytes(String data)
{
return
getBytes(data,
"GBK"
);
}
public
static
short
getShort(
byte
[] bytes)
{
return
(
short
) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));
}
public
static
char
getChar(
byte
[] bytes)
{
return
(
char
) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));
}
public
static
int
getInt(
byte
[] bytes)
{
return
(0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)) | (0xff0000 & (bytes[2] << 16)) | (0xff000000 & (bytes[3] << 24));
}
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));
}
public
static
float
getFloat(
byte
[] bytes)
{
return
Float.intBitsToFloat(getInt(bytes));
}
public
static
double
getDouble(
byte
[] bytes)
{
long
l = getLong(bytes);
System.
out
.println(l);
return
Double.longBitsToDouble(l);
}
public
static
String getString(
byte
[] bytes, String charsetName)
{
return
new
String(bytes, Charset.forName(charsetName));
}
public
static
String getString(
byte
[] bytes)
{
return
getString(bytes,
"GBK"
);
}
public
static
void
main(String[] args)
{
short
s = 122;
int
i = 122;
long
l = 1222222;
char
c =
'a'
;
float
f = 122.22f;
double
d = 122.22;
String string =
"我是好孩子"
;
System.
out
.println(s);
System.
out
.println(i);
System.
out
.println(l);
System.
out
.println(c);
System.
out
.println(f);
System.
out
.println(d);
System.
out
.println(string);
System.
out
.println(
"**************"
);
System.
out
.println(getShort(getBytes(s)));
System.
out
.println(getInt(getBytes(i)));
System.
out
.println(getLong(getBytes(l)));
System.
out
.println(getChar(getBytes(c)));
System.
out
.println(getFloat(getBytes(f)));
System.
out
.println(getDouble(getBytes(d)));
System.
out
.println(getString(getBytes(string)));
}
}