Java EasyExcel 导出报内存溢出如何解决

     String fileName = "large_data.xlsx";     ExcelWriter excelWriter = EasyExcel.write(fileName).build();     WriteSheet writeSheet = EasyExcel.writerSheet("Sheet1").build();
     // 假设每次写入10000条数据     int batchSize = 10000;     List<Data> dataList;     int pageIndex = 0;     do {         // 分页获取数据         dataList = getDataByPage(pageIndex++, batchSize);         excelWriter.write(dataList, writeSheet);     } while (dataList.size() == batchSize);
     // 关闭资源     excelWriter.finish();

     java -Xms512M -Xmx4G -jar yourApp.jar

     EasyExcel.write(fileName)             .registerWriteHandler(new SimpleWriteHandler()) // 不使用自动列宽             .sheet("Sheet1")             .doWrite(dataList);

     try (OutputStream out = new BufferedOutputStream(new FileOutputStream(fileName))) {         ExcelWriter excelWriter = EasyExcel.write(out).build();         WriteSheet writeSheet = EasyExcel.writerSheet("Sheet1").build();         int pageIndex = 0;         List<Data> dataList;         do {             dataList = getDataByPage(pageIndex++, batchSize);             excelWriter.write(dataList, writeSheet);         } while (dataList.size() == batchSize);         excelWriter.finish();     } catch (IOException e) {         e.printStackTrace();     }

import org.apache.poi.ss.usermodel.*;import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import java.io.FileOutputStream;import java.io.IOException;import java.util.ArrayList;import java.util.List;
public class LargeDataExportExample {
    public static void main(String[] args) {        // 文件输出路径        String filePath = "vg_large_data_export.xlsx";                // 导出百万级数据        exportLargeData(filePath);    }
    private static void exportLargeData(String filePath) {        // 每次写入的批次大小        final int batchSize = 10000;        // 数据总条数        final int totalRows = 1_000_000;
        // 创建SXSSFWorkbook对象，内存中只保留100行，超过的部分会写入临时文件        SXSSFWorkbook workbook = new SXSSFWorkbook(100);        workbook.setCompressTempFiles(true); // 启用临时文件压缩
        // 创建工作表        Sheet sheet = workbook.createSheet("Large Data");
        // 创建标题行        Row headerRow = sheet.createRow(0);        String[] headers = {"ID", "Name", "Age"};        for (int i = 0; i < headers.length; i++) {            Cell cell = headerRow.createCell(i);            cell.setCellValue(headers[i]);        }
        int rowNum = 1; // 数据开始的行号
        try {            // 按批次写入数据            for (int i = 0; i < totalRows / batchSize; i++) {                // 模拟获取每批数据                List<Data> dataList = getDataBatch(rowNum, batchSize);                                // 将数据写入到Excel中                for (Data data : dataList) {                    Row row = sheet.createRow(rowNum++);                    row.createCell(0).setCellValue(data.getId());                    row.createCell(1).setCellValue(data.getName());                    row.createCell(2).setCellValue(data.getAge());                }
                // 处理完成一批数据后，可以选择清除缓存数据，防止内存溢出                ((SXSSFSheet) sheet).flushRows(batchSize); // 清除已写的行缓存            }
            // 将数据写入文件            try (FileOutputStream fos = new FileOutputStream(filePath)) {                workbook.write(fos);            }            System.out.println("数据导出完成：" + filePath);
        } catch (IOException e) {            e.printStackTrace();        } finally {            // 关闭workbook并删除临时文件            workbook.dispose();        }    }
    /**     * 模拟分页获取数据     */    private static List<Data> getDataBatch(int startId, int batchSize) {        List<Data> dataList = new ArrayList<>(batchSize);        for (int i = 0; i < batchSize; i++) {            dataList.add(new Data(startId + i, "Name" + (startId + i), 20 + (startId + i) % 50));        }        return dataList;    }
    // 数据类    static class Data {        private final int id;        private final String name;        private final int age;
        public Data(int id, String name, int age) {            this.id = id;            this.name = name;            this.age = age;        }
        public int getId() {            return id;        }
        public String getName() {            return name;        }
        public int getAge() {            return age;        }    }}