hutool读取大excel（超过10M）文件的时候gc会溢出，超出限制，为了解决这个问题，自己编写一个类，以读取大文件

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.Console;
import cn.hutool.poi.excel.sax.Excel07SaxReader;
import cn.hutool.poi.excel.sax.handler.RowHandler;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;public class MyBigExcelUtil {private static List<Object> headLine;private static List<Map<String, Object>> datas = new ArrayList<>();/*** @param pathAndName        文件路径* @param idOrRidOrSheetName Excel中的sheet id或者rid编号或sheet名称，rid必须加rId前缀，例如rId1，如果为-1处理所有编号的sheet*/public static List<Map<String, Object>> readBigExcel(String pathAndName, int idOrRidOrSheetName) {Console.log("【{}】 开始读取 ... ", pathAndName);Excel07SaxReader reader = new Excel07SaxReader(new MyRowHandler());reader.read(pathAndName, idOrRidOrSheetName);Console.log("【{}】 读取完成 ... ", pathAndName);return datas;}/*** @param pathAndName        文件路径* @param idOrRidOrSheetName Excel中的sheet id或者rid编号或sheet名称，rid必须加rId前缀，例如rId1，如果为-1处理所有编号的sheet* @param beanType           类类型* @param fieldMapping       T类型对应的别名，即类类型对应的 excel 的关系* @param <T>                返回值为List<T>* @return*/public static <T> List<T> read(String pathAndName, int idOrRidOrSheetName, Class<T> beanType, Map<String, String> fieldMapping) {readBigExcel(pathAndName, idOrRidOrSheetName);List<T> datalist = new ArrayList<>();CopyOptions copyOptions = CopyOptions.create();copyOptions.setFieldMapping(fieldMapping);for (Map<String, Object> data : datas) {datalist.add(BeanUtil.mapToBean(data, beanType, copyOptions));}return datalist;}/*** @param pathAndName        文件路径* @param idOrRidOrSheetName Excel中的sheet id或者rid编号或sheet名称，rid必须加rId前缀，例如rId1，如果为-1处理所有编号的sheet* @param beanType           类类型* @param <T>                返回值为List<T>* @return*/public static <T> List<T> read(String pathAndName, int idOrRidOrSheetName, Class<T> beanType) {readBigExcel(pathAndName, idOrRidOrSheetName);List<T> datalist = new ArrayList<>();for (Map<String, Object> data : datas) {datalist.add(BeanUtil.mapToBean(data, beanType, CopyOptions.create()));}return datalist;}private static class MyRowHandler implements RowHandler {@Overridepublic void handle(int sheetIndex, long rowIndex, List<Object> rowList) {//Console.log("[{}] [{}] {}", sheetIndex, rowIndex, rowList);if (rowIndex == 0) {headLine = rowList;} else {Map<String, Object> tMap = new HashMap<>(rowList.size());for (int i = 0; i < rowList.size(); i++) {tMap.put(transStr(headLine.get(i)), rowList.get(i));}datas.add(tMap);}}}private static String transStr(Object obj) {return obj == null ? "" : obj.toString();}}