1.Introduce pom file
<!-- 操作以 .xls 为后缀的 Excel -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>4.1.2</version>
</dependency>
<!-- 操作以 .xlsx 为后缀的 Excel -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>4.1.2</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>4.1.2</version>
</dependency>
2. Create util: PoiExcelUtils:
package io.renren.common.utils;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.ss.usermodel.CellType;
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.util.CellRangeAddress;
/**
* 功能: poi导出excel工具类
*/
public class PoiExcelUtils {
/**
* 获取单元格的值
*
* @param fCell
* @return
*/
public static String getCellValue(Cell fCell) {
if (fCell == null)
return "";
return fCell.toString();
}
/**
* 把单元格内容全部转为String
* @param cell
* @return
*/
public static String getCellString(Cell cell){
if (cell == null ) return "";
cell.setCellType(CellType.STRING);
return cell.getStringCellValue();
}
/**
* 合并单元格处理,获取合并行
*
* @param sheet
* @return List<CellRangeAddress>
*/
public static List<CellRangeAddress> getCombineCell(Sheet sheet) {
List<CellRangeAddress> list = new ArrayList<CellRangeAddress>();
// 获得一个 sheet 中合并单元格的数量
int sheetmergerCount = sheet.getNumMergedRegions();
// 遍历所有的合并单元格
for (int i = 0; i < sheetmergerCount; i++) {
// 获得合并单元格保存进list中
CellRangeAddress ca = sheet.getMergedRegion(i);
list.add(ca);
}
return list;
}
public static int getRowNum(List<CellRangeAddress> listCombineCell, Cell cell, Sheet sheet) {
int xr = 0;
int firstC = 0;
int lastC = 0;
int firstR = 0;
int lastR = 0;
for (CellRangeAddress ca : listCombineCell) {
// 获得合并单元格的起始行, 结束行, 起始列, 结束列
firstC = ca.getFirstColumn();
lastC = ca.getLastColumn();
firstR = ca.getFirstRow();
lastR = ca.getLastRow();
//cell.getRowIndex()获取单元格所在行号 cell.getColumnIndex()获取列号
if (cell.getRowIndex() >= firstR && cell.getRowIndex() <= lastR) {
if (cell.getColumnIndex() >= firstC && cell.getColumnIndex() <= lastC) {
xr = lastR;
}
}
}
return xr;
}
/**
* 判断单元格是否为合并单元格，是的话则将单元格的值返回
*
* @param listCombineCell
* 存放合并单元格的list
* @param cell
* 需要判断的单元格
* @param sheet
* sheet
* @return
*/
public static String isCombineCell(List<CellRangeAddress> listCombineCell, Cell cell, Sheet sheet) throws Exception {
int firstC = 0;
int lastC = 0;
int firstR = 0;
int lastR = 0;
String cellValue = null;
for (CellRangeAddress ca : listCombineCell) {
// 获得合并单元格的起始行, 结束行, 起始列, 结束列
firstC = ca.getFirstColumn();
lastC = ca.getLastColumn();
firstR = ca.getFirstRow();
lastR = ca.getLastRow();
if (cell.getRowIndex() >= firstR && cell.getRowIndex() <= lastR) {
if (cell.getColumnIndex() >= firstC && cell.getColumnIndex() <= lastC) {
Row fRow = sheet.getRow(firstR);
Cell fCell = fRow.getCell(firstC);
cellValue = getCellValue(fCell);
break;
}
} else {
cellValue = "";
}
}
return cellValue;
}
/**
* 获取合并单元格的值
*
* @param sheet
* @param row
* @param column
* @return
*/
public static String getMergedRegionValue(Sheet sheet, int row, int column) {
int sheetMergeCount = sheet.getNumMergedRegions();
for (int i = 0; i < sheetMergeCount; i++) {
CellRangeAddress ca = sheet.getMergedRegion(i);
int firstColumn = ca.getFirstColumn();
int lastColumn = ca.getLastColumn();
int firstRow = ca.getFirstRow();
int lastRow = ca.getLastRow();
if (row >= firstRow && row <= lastRow) {
if (column >= firstColumn && column <= lastColumn) {
Row fRow = sheet.getRow(firstRow);
Cell fCell = fRow.getCell(firstColumn);
return getCellValue(fCell);
}
}
}
return null;
}
/**
* 判断指定的单元格是否是合并单元格
*
* @param sheet
* @param row
* 行下标
* @param column
* 列下标
* @return
*/
public static boolean isMergedRegion(Sheet sheet, int row, int column) {
int sheetMergeCount = sheet.getNumMergedRegions();
for (int i = 0; i < sheetMergeCount; i++) {
CellRangeAddress range = sheet.getMergedRegion(i);
int firstColumn = range.getFirstColumn();
int lastColumn = range.getLastColumn();
int firstRow = range.getFirstRow();
int lastRow = range.getLastRow();
if (row >= firstRow && row <= lastRow) {
if (column >= firstColumn && column <= lastColumn) {
return true;
}
}
}
return false;
}
}
3.Code
public R importTarget(MultipartFile file, Integer taskId) throws IOException {
try {
//解析Excel,根据Excel文件创建工作簿
//传入输入流的对象InputStream,获取Workbook
//Workbook工作簿的高级表现形式，是sheet的上级对象。一个excel就是一个工作簿，一个工作簿含有多个工作表(sheet)
Workbook wb = WorkbookFactory.create(file.getInputStream());
//1.2.获取Sheet
Sheet sheet = wb.getSheetAt(0);//参数：索引
//row函数的含义,返回所选择的某一个单元格的行数。
Row row;
//合并单元格处理,获取合并行
List<CellRangeAddress> cras = PoiExcelUtils.getCombineCell(sheet);
//getPhysicalNumberOfRows()获得的实际行数，不一定有数据的行数。
for (int i = 1; i < sheet.getPhysicalNumberOfRows(); i++) {
//sheet.getRow(i)获取第i行的所有数据
Row BigRow = sheet.getRow(i);
if (BigRow == null) {
break;
}
row = sheet.getRow(i);
//判断指定的单元格是否是合并单元格
if (PoiExcelUtils.isMergedRegion(sheet, i, 0)) {
//sheet.getRow(i).getCell(0)获取第i行第1个格
int lastRow = PoiExcelUtils.getRowNum(cras, sheet.getRow(i).getCell(0), sheet);
for (; i <= lastRow; i++) {
row = sheet.getRow(i);
// 判断该行第1列是合并单元格
if (PoiExcelUtils.isMergedRegion(sheet, i, 0)) {
int lastRow2 = PoiExcelUtils.getRowNum(cras, sheet.getRow(i).getCell(4), sheet);
for (; i <= lastRow2; i++) {
Row nextRow = sheet.getRow(i);
//实体类
ExcelTarget target = new ExcelTarget();
buildTarget(row, BigRow, nextRow, target);
targetService.save(target);
}
} else {
ExcelTarget target = new ExcelTarget();
buildTarget(row, BigRow, row, target);
targetService.save(target);
}
}
i--;
} else {
row = sheet.getRow(i);
ExcelTarget target = new ExcelTarget();
buildTarget(row, BigRow, row, target);
targetService.save(target);
}
}
return R.ok("导入成功");
}catch (IOException e){
e.printStackTrace();
return R.error("导入失败");
}
}
private void buildTarget(Row row, Row BigRow, Row nextRow, ExcelTarget target) {
//下标从0开始读取
final String name = PoiExcelUtils.getCellString(BigRow.getCell(1)); // 姓名
target.setName(name);
String sex = PoiExcelUtils.getCellString(BigRow.getCell(2)); // 性别(1:男2:女)
if (sex.equals("男")){
target.setSex(1);
}else if (sex.equals("女")){
target.setSex(2);
}
target.setCreateTime(new Date());
}