java class 转byte_Java各个类型与byte[]的转换

short 转byte[]

int temp = val;

byte[] bt=new byte[2];

for (int i = 0; i < 2; i++)

{

bt[i]=new Integer(temp & 0xff).byteValue();// 将最低位保存在最低位

temp = temp >> 8; // 向右移8位

}

int 转byte[]

int temp = v;

byte[] bt = new byte[4];

for (int i = 0; i < bt.length; i++)

{

bt[i] = new Integer(temp & 0xff).byteValue();// 将最低位保存在最低位

temp = temp >> 8; // 向右移8位

}

long 转byte[]

long temp = v;

byte writeBuffer[] = new byte[8];

for (int i = 0; i < writeBuffer.length; i++)

{

writeBuffer[i] = new Long(temp & 0xff).byteValue();   // 将最低位保存在最低位

temp = temp >> 8;   // 向右移8位

}

String 转byte[]

String s=new String("测试");

byte[] wrbyte = s.getBytes();

byte[]转short

int reval1 = 0;

int reval2 = 0;

int reval3 = 0;

int reval4 = 0;

try

{

reval1 = stream.read();

reval2 = stream.read();

reval3 = stream.read();

reval4 = stream.read();

} catch (IOException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

int returnval=(reval1) | (reval2 << 8) ;

byte[]转int

int reval1 = 0;

int reval2 = 0;

int reval3 = 0;

int reval4 = 0;

try

{

reval1 = stream.read();

reval2 = stream.read();

reval3 = stream.read();

reval4 = stream.read();

} catch (IOException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

int returnval=(reval1) | (reval2 << 8) | (reval3 << 16) |(reval4 << 24);byte[]转long

int reval1 = 0;

int reval2 = 0;

int reval3 = 0;

int reval4 = 0;

try

{

reval1 = stream.read();

reval2 = stream.read();

reval3 = stream.read();

reval4 = stream.read();

} catch (IOException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

int returnval=(reval1) | (reval2 << 8) | (reval3 << 16) |(reval4 << 24)|(reval4 << 32)|(reval4 << 48)|(reval4 << 64)|(reval4 << 72);;

byte[]转String