SpringBoot实现Excel读取的实例教程

这是本人写的一个SpringBoot对Excel读取的方法，实测能用，待提升的地方有很多，有不足之处请多多指点。

Excel2003版（后缀为.xls）最大行数是65536行，最大列数是256列。

Excel2007以上的版本（后缀为.xlsx）最大行数是1048576行，最大列数是16384列。

提供2种方法读取：

1.根据指定的开始和结束行数读取返回结果，结果格式为List>

2.根据指定的开始和结束行数读取返回结果，结果格式为List

请根据实际内存堆可用大小进行读取，太多可进行分段读取（类似分页的原理）

 
  org.apache.poi
  poi
  4.0.1
 
 
  org.apache.poi
  poi-ooxml
  4.0.1
 

package com.cly.utils.Excel;



public class ExcelPOJO {
 public String getName() {
 return name;
 }
 public void setName(String name) {
 this.name = name;
 }
 public String getPasswork() {
 return passwork;
 }
 public void setPasswork(String passwork) {
 this.passwork = passwork;
 }
 public String getLook() {
 return look;
 }
 public void setLook(String look) {
 this.look = look;
 }
 
 @excelRescoure(value = "XM")
 private String name;
 @excelRescoure(value = "SFZH")
 private String passwork;
 @excelRescoure()
 private String look;
 
 @Override
 public String toString(){
 return "name:"+this.getName()+",passwork:"+this.getPasswork()+",look:"+this.getLook();
 }
 public ExcelPOJO() {}
}

package com.cly.utils.Excel;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;


@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
public @interface excelRescoure {
 String value() default "";//默认为空
}

package com.cly.utils.Excel;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.sun.org.apache.bcel.internal.generic.NEW;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.formula.functions.T;
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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.xml.transform.Source;
import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.*;
import java.text.DecimalFormat;
import java.util.*;


public class excelRead {
 //日志输出
 private static Logger logger = LoggerFactory.getLogger(excelRead.class);
 //定义excel类型
 private static final String XLS = "xls";
 private static final String XLSX = "xlsx";

 
 private static Workbook getWorkbook(InputStream inputStream, String fileType) throws IOException {
 //用自带的方法新建工作薄
 Workbook workbook = WorkbookFactory.create(inputStream);
 //后缀判断有版本转换问题
 //Workbook workbook = null;
 //if (fileType.equalsIgnoreCase(XLS)) {
 // workbook = new HSSFWorkbook(inputStream);
 //} else if (fileType.equalsIgnoreCase(XLSX)) {
 // workbook = new XSSFWorkbook(inputStream);
 //}
 return workbook;
 }


 
 private static String convertCellValueToString(Cell cell) {
 if (cell == null) {
  return null;
 }
 String returnValue = null;
 switch (cell.getCellType()) {
  case NUMERIC: //数字
  Double doublevalue = cell.getNumericCellValue();
  // 格式化科学计数法，取一位整数，如取小数，值如0.0,取小数点后几位就写几个0
  DecimalFormat df = new DecimalFormat("0");
  returnValue = df.format(doublevalue);
  break;
  case STRING: //字符串
  returnValue = cell.getStringCellValue();
  break;
  case BOOLEAN: //布尔
  Boolean booleanValue = cell.getBooleanCellValue();
  returnValue = booleanValue.toString();
  break;
  case BLANK: // 空值
  break;
  case FORMULA: // 公式
  returnValue = cell.getCellFormula();
  break;
  case ERROR: // 故障
  break;
  default:
  break;
 }
 return returnValue;
 }

 
 private static List> HandleData(Workbook workbook, int StatrRow, int EndRow, boolean ExistTop) {
 //声明返回结果集result
 List> result = new ArrayList<>();
 //声明一个Excel头部函数
 ArrayList top = new ArrayList<>();
 //解析sheet（sheet是Excel脚页）
 
 for (int sheetNum = 0; sheetNum < workbook.getNumberOfSheets(); sheetNum++) {
  Sheet sheet = workbook.getSheetAt(sheetNum);
  // 校验sheet是否合法
  if (sheet == null) {
  continue;
  }
  //如存在头部，处理头部数据
  if (ExistTop) {
  int firstRowNum = sheet.getFirstRowNum();
  Row firstRow = sheet.getRow(firstRowNum);
  if (null == firstRow) {
   logger.warn("解析Excel失败，在第一行没有读取到任何数据！");
  }
  for (int i = 0; i < firstRow.getLastCellNum(); i++) {
   top.add(convertCellValueToString(firstRow.getCell(i)));
  }
  }
  //处理Excel数据内容
  int endRowNum;
  //获取结束行数
  if (EndRow == -1) {
  endRowNum = sheet.getPhysicalNumberOfRows();
  } else {
  endRowNum = EndRow <= sheet.getPhysicalNumberOfRows() ? EndRow : sheet.getPhysicalNumberOfRows();
  }
  //遍历行数
  for (int i = StatrRow - 1; i < endRowNum; i++) {
  Row row = sheet.getRow(i);
  if (null == row) {
   continue;
  }
  Map map = new HashMap<>();
  //获取所有列数据
  for (int y = 0; y < row.getLastCellNum(); y++) {
   if (top.size() > 0) {
   if (top.size() >= y) {
    map.put(top.get(y), convertCellValueToString(row.getCell(y)));
   } else {
    map.put(String.valueOf(y + 1), convertCellValueToString(row.getCell(y)));
   }
   } else {
   map.put(String.valueOf(y + 1), convertCellValueToString(row.getCell(y)));
   }
  }
  result.add(map);
  }
 }
 return result;
 }

 
 public static List> ReadExcelByRC(String fileName, int StatrRow, int EndRow, boolean ExistTop) {
 //判断输入的开始值是否少于等于结束值
 if (StatrRow > EndRow && EndRow != -1) {
  logger.warn("输入的开始行值比结束行值大，请重新输入正确的行数");
  List> error = null;
  return error;
 }
 //声明返回的结果集
 List> result = new ArrayList<>();
 //声明一个工作薄
 Workbook workbook = null;
 //声明一个文件输入流
 FileInputStream inputStream = null;
 try {
  // 获取Excel后缀名，判断文件类型
  String fileType = fileName.substring(fileName.lastIndexOf(".") + 1);
  // 获取Excel文件
  File excelFile = new File(fileName);
  if (!excelFile.exists()) {
  logger.warn("指定的Excel文件不存在！");
  return null;
  }
  // 获取Excel工作簿
  inputStream = new FileInputStream(excelFile);
  workbook = getWorkbook(inputStream, fileType);
  //处理Excel内容
  result = HandleData(workbook, StatrRow, EndRow, ExistTop);
 } catch (Exception e) {
  logger.warn("解析Excel失败，文件名：" + fileName + " 错误信息：" + e.getMessage());
 } finally {
  try {
  if (null != workbook) {
   workbook.close();
  }
  if (null != inputStream) {
   inputStream.close();
  }
  } catch (Exception e) {
  logger.warn("关闭数据流出错！错误信息：" + e.getMessage());
  return null;
  }
 }
 return result;
 }




 
 public static List