public class Util {
final static int LINE_COUNT = 16;
final static int WORD_COUNT = 2;
public static StringBuffer toHex(byte b)
{
byte factor = 16;
int v = b & 0xff;//去掉byte转换之后的负数部分。
byte high = (byte)( v / factor);
byte low = (byte)(v % factor);
StringBuffer buf = new StringBuffer();
buf.append(toHexLow(high)).append(toHexLow(low));
return buf;
}
private static char toHexLow(byte b)
{
if(b > 16 || b < 0 )
{
throw new IllegalArgumentException("inpt parameter should less than 16 and greater than 0");
}
if(b < 10){
return (char)('0' + (char)b);
}
else{
return (char)('A' + (b-10));
}
}
public static StringBuffer toHex(int val)
{
StringBuffer buf = toHex((byte)(val >>24 & 0xff)).append(toHex((byte)(val>>16&0xff)));
return buf.append(toHex((byte)(val>>8&0xff))).append(toHex((byte)(val & 0xff)));
}
/**
* 打印二进制数组
* @param arr
* @param off
* @param len
*/
public static void printBytes(byte [] arr,int off,int len)
{
if(arr == null || len <= 0 || off <0 || off + len > arr.length){
return;
}
int count = 0;
for(int i = off; count < len; ++i)
{
System.out.print(toHex(arr[i]));
++ count;
if(count% WORD_COUNT == 0)
{
System.out.print(' ');
}
if(count % LINE_COUNT == 0)
{
System.out.println();
}
}
}
public static void main(String[] args) {
byte[] arr = new byte[256];
for(int i = 0; i < 256;++i )
{
arr[i] = (byte)i;
}
printBytes(arr,0,256);
printBytes(arr,240,16);
System.out.println(toHex(1));
System.out.println(toHex(0xffffffff));
System.out.println(toHex(0xeeffaacc));
}
}
另外c++写好的小端序的int数据,用java读入如此处理
private static int convertInt(byte[] arr)
{
if(arr == null || arr.length != 4)
{
throw new IllegalArgumentException("bytes array error");
}
int val = (arr[0] & 0xff) | (arr[1] & 0xff)<<8 | (arr[2] & 0xff)<<16 | (arr[3]&0xff)<<24;
return val;
}
posted on 2011-11-02 21:36
huohuo 阅读(5384)
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