1、int、float字节转换
/**
* int转为低字节在前，高字节在后的byte数组 VC
*
@param n
*
@return byte[]
*/
private byte[] toLH(int n){
byte[] b = new byte[
4];
b[
0] = (byte) (n &
0xff);
b[
1] = (byte) (n >>
8 &
0xff);
b[
2] = (byte) (n >>
16 &
0xff);
b[
3] = (byte) (n >>
24 &
0xff);
return b;
}
/**
* 将float转为低字节在前，高字节在后的byte数组
*
@param f
*
@return byte[]
*/
private byte[] toLH(float f) {
return toLH(Float.floatToRawIntBits(f));
}
public static byte[] intToByteArray(int i) throws Exception {
ByteArrayOutputStream buf = new ByteArrayOutputStream();
DataOutputStream dos= new DataOutputStream(buf);
dos.writeInt(i);
byte[] b = buf.toByteArray();
dos.close();
buf.close();
return b;
}
public static int ByteArrayToInt(byte b[]) throws Exception {
int temp =
0, a=
0;
ByteArrayInputStream buf = new ByteArrayInputStream(b);
DataInputStream dis= new DataInputStream (buf);
return dis.readInt();
}
2、Java使用DataOutputStream发送对象
(1)将C++结构体转化为对应的JAVA类
C++定义的结构体:
typedef struct
{
char szHead[
4]; // 标志（
'H' 'E' 'A' 'D'）
DWORD dwSize; // 大小
}T_Head;
对应的JAVA类：
public
class Head(){
private byte[] head;
private int size;
public Head(byte[] head,int size){
this.head = head;
this.size = size;
}
public byte[] getHead(){
return this.head;
}
public int getSize(){
return this.size;
}
public void setHead(byte[] head){
this.head = head;
}
public void setSize(int size){
this.size = size;
}
(2)DataOutputStream发送数据
DataOutputStream out = new DataOutputStream(socket.getOutputStream());
out.write(cmdHead.getHead());
out.write(toLH(cmdHead.getSize()));
out.flush();
byte[] recvHead =newbyte[
4];
int size;
// readcmd转换字节序
socket.getInputStream().read(recvHead,
0,
4);
// read length转换字节序
socket.getInputStream().read(recvHead,
0,
4);
size = ByteArrayToInt(recvHead);
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