按字符大小分割字符串

/**
 * 得到一个字符串应该被分割的位置数组
 * @param s
 * @return
 */
public static int[] lengthSplitArr(@NotNull String s, int splitSize) {
    if (s == null)
        return new int[0];
    char[] c = s.toCharArray();
    int[] temp = new int[(c.length * 2 / splitSize) + 1];
    int loc = 0;
    int clearPoint = 0;
    int splitPoint = clearPoint +  splitSize;
    int len = 0;
    for (int i = 0; i < c.length; i++) {
        len++;
        if (!isLetter(c[i])) {
            len++;
        }
        if (len >= splitPoint) {
            if (len > splitPoint) {
                clearPoint = splitPoint - 1;
                temp[loc] = i - 1;
            } else if(len == splitPoint){
                clearPoint = splitPoint;
                temp[loc] = i;
            }
            loc++;
            splitPoint = clearPoint +  splitSize;
        }
    }
    int [] result = new int[loc];
    System.arraycopy(temp, 0, result, 0, loc);
    return result;

}