public boolean gbk(String str)
{
char[] chars=str.toCharArray();
boolean isGB2312=false;
for(int i=0;i<chars.length;i++){
byte[] bytes=(""+chars[i]).getBytes();
if(bytes.length==2){
int[] ints=new int[2];
ints[0]=bytes[0]& 0xff;
ints[1]=bytes[1]& 0xff;
if(ints[0]>=0x81 && ints[0]<=0xFE && ints[1]>=0x40 && ints[1]<=0xFE){
isGB2312=true;
break;
}
}
}
return isGB2312;
}
参考资料:http://blog.csdn.net/teamoli/archive/2008/10/29/3176597.aspx