【poi】解决java导出excel 海量数据内存溢出问题

import java.io.FileOutputStream;
import org.apache.commons.lang.exception.ExceptionUtils;
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.ss.util.CellReference;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 
public class Test {
    public static void main(String[] args) {
        if (args[0].equals("hssf")) {
            hssfTest();
        }
 
        if (args[0].equals("sxssf")) {
            sxssfTest();
        }
    }
 
    public static void sxssfTest() {
 
        Workbook wb = new SXSSFWorkbook(100); // keep 100 rows in memory,
        // exceeding rows will be
        // flushed to diskSheet sh = wb.createSheet()
        ;
        int rownum = 0;
        try {
            while (true) {
                Row row = sh.createRow(rownum);
                for (int cellnum = 0; cellnum < 10; cellnum++) {
                    Cell cell = row.createCell(cellnum);
                    String address = new CellReference(cell).formatAsString();
                    cell.setCellValue(address);
                }
                System.out.println(rownum);
                rownum++;
                if (rownum >= 1000000)
                    break;
 
            }
            FileOutputStream out = new FileOutputStream("c:/sxssf.xlsx");
            wb.write(out);
            out.close();
        } catch (Exception e) {
            System.out.println(ExceptionUtils.getFullStackTrace(e));
        }
    }
 
    public static void hssfTest() {
        XSSFWorkbook wb = new XSSFWorkbook();
        Sheet sh = wb.createSheet();
        int rownum = 0;
        try {
            while (true) {
                Row row = sh.createRow(rownum);
                for (int cellnum = 0; cellnum < 10; cellnum++) {
                    Cell cell = row.createCell(cellnum);
                    String address = new CellReference(cell).formatAsString();
                    cell.setCellValue(address);
                }
                System.out.println(rownum);
                rownum++;
                if (rownum >= 1000000)
                    break;
            }
            FileOutputStream out = new FileOutputStream("c:/hssf.xlsx");
            wb.write(out);
            out.close();
        } catch (Exception e) {
            System.out.println(ExceptionUtils.getFullStackTrace(e));
        }
    }
}