测试分页查询出数据并分文件导出[java工程]

 package cn.shiyanjun.test;

 import java.util.ArrayList;
 import java.util.List;

 public class ExcelTest3 {
     List<Integer> rowData = getRowData(17);
     public static void main(String[] args) {
         ExcelTest3 excelTest3 = new ExcelTest3();
         excelTest3.exportExcelTest();
     }

 //    ==================================================================================================
     public void exportExcelTest() {
         int dataCount = rowData.size();//数据总数59
         int exNum = 6;//每个文件导出数
         int qryNum = 8;//已知查询数
         int qryCount = getCount(dataCount,qryNum);
         int end = 1;
         int fileNum = 0;
         List<Integer> list = new ArrayList<Integer>();

         for (int i = 0; i < qryCount; i++) {
             List<Integer> beanList = new ArrayList<Integer>();
             if(i != (qryCount - 1)){//如果不是最后一次查询
                 beanList = queryForPage(i*qryNum, (i+1)*qryNum);//一次查8条
             }else{
                 beanList = rowData.subList(i*qryNum, dataCount);
             }
             for (int j = 0; j < beanList.size(); j++) {//遍历这8条数据
                 list.add(beanList.get(j));
                 if(list.size() == exNum || (end ==qryCount && j == beanList.size() -1 )){
                     System.out.println((fileNum+1) + ".xls");//创建文件
                     System.out.println("导出"+list.size()+"条数据："+list);
                     list.clear();
                     fileNum++;
                 }
             }
             end++;
         }

     }

     public List<Integer> queryForPage(int startIndex, int pageSize){
         List<Integer> pageData = rowData.subList(startIndex, pageSize);
         return pageData;
     }

     //根据count和rows来计算个数
     public int getCount(int count, int rows) {
         int num = 1;
         if(count >= rows){
             if(count % rows == 0){
                 num = count/rows;
             }else{
                 num = count/rows + 1;
             }
         }
         return num;
     }

     //创建一个包含若干2位随机整数的list集合
     public List<Integer> getRowData(int count){
         List<Integer> list = new ArrayList<Integer>();
         for(int i = 0; i < count; i++){
 //            int num = (int) Math.round(Math.random()*90+10);
             list.add(i);
         }
         return list;
     }

     public void printExcelApi(List<Integer> exList, List<Integer> list){
         exList.addAll(list);
     }

 }