读取大数据量的excel时

代码如下

private static RowHandler createRowHandler() {return new RowHandler() {@Overridepublic void handle(int i, long l, List<Object> list) {System.out.println(i + " " + l + " " + list);}};}public static void main(String[] args) {File file = FileUtil.file("d:/1.xlsx");ExcelUtil.readBySax(file,-1,createRowHandler());}

报错

NoSuchMethodError:org.apache.poi.util.XMLHelper.newXMLReader()

解决办法

修改源码

ExcelSaxUtil中readFrom方法中的xmlReader = XMLHelper.newXMLReader();

改为

xmlReade SAXHelper.newXMLReader();

或者升级poi到5.x

读取sheet名称问题

代码如下

 public static List<String> getSheetNames() throws IOException {OPCPackage open = null;try {File file = FileUtil.file("d:/1.xlsx");open = OPCPackage.open(file, PackageAccess.READ);XSSFReader xssfReader = new XSSFReader(open);SheetRidReader parse = SheetRidReader.parse(xssfReader);List<String> sheetNames = parse.getSheetNames();return sheetNames;} catch (IOException e) {throw new RuntimeException(e);} catch (OpenXML4JException e) {throw new RuntimeException(e);} finally {if (open!= null){open.close();}}}

这是运行没问题的 

当将open = OPCPackage.open(file, PackageAccess.READ);改为文件流的形式如下

open = OPCPackage.open(new FileInputStream(file));

将报错

Zip bomb detected! The file would exceed the max. ratio of compressed file size to the size of the expanded data.
This may indicate that the file is used to inflate memory usage and thus could pose a security risk.
You can adjust this limit via ZipSecureFile.setMinInflateRatio() if you need to work with files which exceed this limit.
Uncompressed size: 233647, Raw/compressed size: 2324, ratio: 0.009947
Limits: MIN_INFLATE_RATIO: 0.010000, Entry: xl/styles.xml

包括获取文件内容时将

ExcelUtil.readBySax(file,-1,createRowHandler());改为流的形式如下

ExcelUtil.readBySax(new FileInputStream(file),-1,createRowHandler());
同样会报这个错

这是因为压缩率超过范围了 在执行之前添加代码

ZipSecureFile.setMinInflateRatio(-1.0);即可解决

改完后代码如下

package org.example;import cn.hutool.core.io.FileUtil;
import cn.hutool.poi.excel.ExcelUtil;
import cn.hutool.poi.excel.sax.SheetRidReader;
import cn.hutool.poi.excel.sax.handler.RowHandler;
import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.openxml4j.opc.PackageAccess;
import org.apache.poi.openxml4j.util.ZipSecureFile;
import org.apache.poi.util.XMLHelper;
import org.apache.poi.xssf.eventusermodel.XSSFReader;import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.List;public class Test5 {private static RowHandler createRowHandler() {return new RowHandler() {@Overridepublic void handle(int i, long l, List<Object> list) {System.out.println(i + " " + l + " " + list);}};}public static void main(String[] args) throws FileNotFoundException {ZipSecureFile.setMinInflateRatio(-1.0);File file = FileUtil.file("d:/1.xlsx");ExcelUtil.readBySax(new FileInputStream(file),-1,createRowHandler());}public static List<String> getSheetNames() throws IOException {OPCPackage open = null;try {ZipSecureFile.setMinInflateRatio(-1.0);File file = FileUtil.file("d:/1.xlsx");open = OPCPackage.open(new FileInputStream(file));XSSFReader xssfReader = new XSSFReader(open);SheetRidReader parse = SheetRidReader.parse(xssfReader);List<String> sheetNames = parse.getSheetNames();return sheetNames;} catch (IOException e) {throw new RuntimeException(e);} catch (OpenXML4JException e) {throw new RuntimeException(e);} finally {if (open!= null){open.close();}}}}