Poi多线程分割

 业务:利用sax将表格解析为xml快速读取表格百万级数据,利用多线程将这批数据分割为以一千为单位的小型的excel,根据表头分割出表名,只取第一张表的所有数据

public static void DataInsertData() throws InterruptedException {

    for (int i = 0; i < stringlist.size(); i++) {
        TableEntity tableEntity = tabledata.get(stringlist.get(i));
        String columnnum = tableEntity.getColumnnum();
        String[] split = columnnum.split(",");
        ArrayList<String> tablelins = new ArrayList<>();
        for (int j = 0; j < tableslist.size(); j++) {
            ArrayList<String> arrlist = new ArrayList<>();
            for (int k = 0; k < split.length; k++) {
                String s = tableslist.get(j).get(Integer.parseInt(split[k]));
                arrlist.add(s);
            }
            tablelins.add(arrlist.toString());
            list.add(arrlist);
            if(j%1000==0){
                ThreadExcelImport threadExcelImport = new ThreadExcelImport(list);
                Thread.sleep(10000);
                threadExcelImport.start();
                list.clear();
            }
        }
        tabledata.get(stringlist.get(i)).setColumnvalue(tablelins);
    }
}

多线程执行生成以一千为单位的excel格式

package com.bootdo.gi;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.*;
import java.util.List;
import java.util.Random;

/**
 * Created by tiantian on 2019/7/31.
 */
public class ThreadExcelImport extends Thread {
    private static Workbook wb;

    private List<List<String>> list;

    public ThreadExcelImport(List<List<String>> list) {
        this.list = list;
    }

    public List<List<String>> getList() {
        return list;
    }

    public void setList(List<List<String>> list) {
        this.list = list;
    }

    @Override
    public void run() {

    wb = new XSSFWorkbook();
    Sheet sheet = wb.createSheet();
    for (int i = 0; i <list.size() ; i++) {
        Row row = sheet.createRow(i);
        List<String> rowList = this.list.get(i);
        for (int j = 0; j <rowList.size() ; j++) {
            Cell cell = row.createCell(j);
            cell.setCellValue(rowList.get(j));
        }
    }

    try {
        wb.write(new FileOutputStream(new File("D:\\生成的大量数据\\数据表"+new Random().nextInt(100)+".xlsx")));
    } catch (IOException e) {
        e.printStackTrace();
    }

}
}