截取字符串

public static String splitUTF(String str,int bytes) throws UnsupportedEncodingException{
int hanZiBytes = 0;
int interceptBytes = 0;

byte[] strByte= str.getBytes("UTF-8");

for (int i = 0; i < bytes; i++) {
if (strByte[i] < 0) {
hanZiBytes++;
}
}

if(hanZiBytes % 3 == 0){
interceptBytes=bytes;
}else if(hanZiBytes % 3 == 1){
interceptBytes=bytes-1;
}else if(hanZiBytes % 3 == 2){
interceptBytes=bytes-2;
}

return new String(strByte, 0, interceptBytes, "UTF-8");
}

public static String splitGBK(String str,int bytes) throws UnsupportedEncodingException{

int hanZiBytes = 0;
int interceptBytes = 0;

byte[] strByte= str.getBytes("GBK");

for (int i = 0; i < bytes; i++) {
if (strByte[i] < 0) {
hanZiBytes++;
}
}
interceptBytes = (hanZiBytes % 2 == 0) ? bytes : bytes - 1;
return  new String(strByte, 0, interceptBytes, "GBK");
}