java 将长字符串截取为指定位数短字符代码

//原始长字符串strContext
String  strContext = "长字符串................................";
ArrayList<String> arrayList = new ArrayList(5);
int totalNo = strContext.length();
//小字符串长度pageSize
int pageSize = 20;
if (totalNo > pageSize) {
  //取模等于0，说明每页数据记录数一致，如果不等于0，说明最后一页数据数少
  int pageIndex = totalNo % pageSize == 0 ? totalNo / pageSize : totalNo / pageSize + 1;
  for (int i = 0; i <= pageIndex - 1; i++) {
    int startLineIndex = i * pageSize;
    int maxLine = (i + 1) * pageSize;
    maxLine = maxLine > totalNo ? totalNo : maxLine;
    System.out.println("startLindInde" + startLineIndex+"\t maxLine" + maxLine+"\t pageSize" + pageSize+"\t page"+i);
    System.out.println(strContext.substring(startLineIndex, maxLine));
    arrayList.add(strContext.substring(startLineIndex, maxLine));
  }
}