Java实现excel数据读取并导入数据库（excel版本为2003）
Java实现excel数据读取并导入数据库（excel版本为2003）
1.在pom.xml中导入相关坐标
<!--导入读取Excel表的相关依赖-->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>4.1.2</version>
</dependency>
<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.添加导入excel文件工具类ImportExeclUtil
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
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.ss.util.NumberToTextConverter;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import com.sun.org.apache.xerces.internal.impl.xpath.regex.ParseException;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Locale;
public class ImportExeclUtil {
private static int totalRows = 0;// 总行数
private static int totalCells = 0;// 总列数
private static String errorInfo;// 错误信息
/** 无参构造方法 */
public ImportExeclUtil()
{
}
public static int getTotalRows()
{
return totalRows;
}
public static int getTotalCells()
{
return totalCells;
}
public static String getErrorInfo()
{
return errorInfo;
}
/**
*
* 根据流读取Excel文件
*
*
* @param inputStream
* @param isExcel2003
* @return
* @see [类、类#方法、类#成员]
*/
public List<List<String>> read(InputStream inputStream, boolean isExcel2003)
throws IOException
{
List<List<String>> dataLst = null;
/** 根据版本选择创建Workbook的方式 */
Workbook wb = null;
if (isExcel2003)
{
wb = new HSSFWorkbook(inputStream);
}
else
{
wb = new XSSFWorkbook(inputStream);
}
dataLst = readDate(wb);
return dataLst;
}
/**
*
* 读取数据
*
* @param wb
* @return
* @see [类、类#方法、类#成员]
*/
private List<List<String>> readDate(Workbook wb)
{
List<List<String>> dataLst = new ArrayList<List<String>>();
/** 得到第一个shell */
Sheet sheet = wb.getSheetAt(0);
/** 得到Excel的行数 */
totalRows = sheet.getPhysicalNumberOfRows();
/** 得到Excel的列数 */
if (totalRows >= 1 && sheet.getRow(0) != null)
{
totalCells = sheet.getRow(0).getPhysicalNumberOfCells();
}
/** 循环Excel的行 */
for (int r = 2; r < totalRows; r++)
{
Row row = sheet.getRow(r);
if (row == null)
{
continue;
}
List<String> rowLst = new ArrayList<String>();
/** 循环Excel的列 */
for (int c = 0; c < getTotalCells(); c++)
{
Cell cell = row.getCell(c);
String cellValue = "";
if (null != cell)
{
// 以下是判断数据的类型
switch (cell.getCellTypeEnum())
{
case NUMERIC: // 数字
//如果是日期的话
if(cell != null && HSSFDateUtil.isCellDateFormatted(cell)){
Date d = cell.getDateCellValue();
DateFormat formater = new SimpleDateFormat("yyyy/MM/dd");
String da = formater.format(d);
cellValue = da;
break;
}
cellValue = NumberToTextConverter.toText(cell.getNumericCellValue());
break;
case STRING: // 字符串
cellValue = cell.getStringCellValue();
break;
case BOOLEAN: // Boolean
cellValue = cell.getBooleanCellValue() + "";
break;
case FORMULA: // 公式
cellValue = cell.getCellFormula() + "";
break;
case BLANK: // 空值
cellValue = "";
break;
case ERROR: // 故障
cellValue = "非法字符";
break;
default:
cellValue = "未知类型";
break;
}
}
rowLst.add(cellValue);
}
/** 保存第r行的第c列 */
dataLst.add(rowLst);
}
return dataLst;
}
/**
*
* 根据Excel表格中的数据判断类型得到值
*
* @param cell
* @return
* @see [类、类#方法、类#成员]
*/
/*private static String getCellValue(Cell cell)
{
String cellValue = "";
if (null != cell)
{
// 以下是判断数据的类型
switch (cell.getCellType())
{
case HSSFCell.CELL_TYPE_NUMERIC: // 数字
;: // 数字
if (org.apache.poi.ss.usermodel.DateUtil.isCellDateFormatted(cell))
{
DateTest theDate = cell.getDateCellValue();
SimpleDateFormat dff = new SimpleDateFormat("yyyy-MM-dd");
cellValue = dff.format(theDate);
}
else
{
DecimalFormat df = new DecimalFormat("0");
cellValue = df.format(cell.getNumericCellValue());
}
break;
case HSSFCell.CELL_TYPE_STRING: // 字符串
cellValue = cell.getStringCellValue();
break;
case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean
cellValue = cell.getBooleanCellValue() + "";
break;
case HSSFCell.CELL_TYPE_FORMULA: // 公式
cellValue = cell.getCellFormula() + "";
break;
case HSSFCell.CELL_TYPE_BLANK: // 空值
cellValue = "";
break;
case HSSFCell.CELL_TYPE_ERROR: // 故障
cellValue = "非法字符";
break;
default:
cellValue = "未知类型";
break;
}
}
return cellValue;
}*/
/**
*
* 根据实体成员变量的类型得到成员变量的值
*
* @param realValue
* @param fields
* @param f
* @param cellValue
* @return
* @see [类、类#方法、类#成员]
*/
private static Object getEntityMemberValue(Object realValue, Field[] fields, int f, String cellValue)
{
String type = fields[f].getType().getName();
switch (type)
{
case "char":
case "java.lang.Character":
case "java.lang.String":
realValue = cellValue;
break;
case "java.util.DateTest":
realValue = StringUtils.isBlank(cellValue) ? null : DateUtil.strToDate(cellValue, DateUtil.YYYY_MM_DD);
break;
case "java.lang.Integer":
realValue = StringUtils.isBlank(cellValue) ? null : Integer.valueOf(cellValue);
break;
case "int":
case "float":
case "double":
case "java.lang.Double":
case "java.lang.Float":
case "java.lang.Long":
case "java.lang.Short":
case "java.math.BigDecimal":
realValue = StringUtils.isBlank(cellValue) ? null : new BigDecimal(cellValue);
break;
default:
break;
}
return realValue;
}
/**
*
* 根据路径或文件名选择Excel版本
*
*
* @param filePathOrName
* @param in
* @return
* @throws IOException
* @see [类、类#方法、类#成员]
*/
public static Workbook chooseWorkbook(String filePathOrName, InputStream in)
throws IOException
{
/** 根据版本选择创建Workbook的方式 */
Workbook wb = null;
boolean isExcel2003 = ExcelVersionUtil.isExcel2003(filePathOrName);
if (isExcel2003)
{
wb = new HSSFWorkbook(in);
}
else
{
wb = new XSSFWorkbook(in);
}
return wb;
}
static class ExcelVersionUtil
{
/**
*
* 是否是2003的excel，返回true是2003
*
*
* @param filePath
* @return
* @see [类、类#方法、类#成员]
*/
public static boolean isExcel2003(String filePath)
{
return filePath.matches("^.+\\.(?i)(xls)$");
}
/**
*
* 是否是2007的excel，返回true是2007
*
*
* @param filePath
* @return
* @see [类、类#方法、类#成员]
*/
public static boolean isExcel2007(String filePath)
{
return filePath.matches("^.+\\.(?i)(xlsx)$");
}
}
public static class DateUtil
{
// ======================日期格式化常量=====================//
public static final String YYYY_MM_DDHHMMSS = "yyyy-MM-dd HH:mm:ss";
public static final String YYYY_MM_DD = "yyyy-MM-dd";
public static final String YYYY_MM = "yyyy-MM";
public static final String YYYY = "yyyy";
public static final String YYYYMMDDHHMMSS = "yyyyMMddHHmmss";
public static final String YYYYMMDD = "yyyyMMdd";
public static final String YYYYMM = "yyyyMM";
public static final String YYYYMMDDHHMMSS_1 = "yyyy/MM/dd HH:mm:ss";
public static final String YYYY_MM_DD_1 = "yyyy/MM/dd";
public static final String YYYY_MM_1 = "yyyy/MM";
/**
*
* 自定义取值，Date类型转为String类型
*
* @param date 日期
* @param pattern 格式化常量
* @return
* @see [类、类#方法、类#成员]
*/
public static String dateToStr(Date date, String pattern)
{
SimpleDateFormat format = null;
if (null == date)
return null;
format = new SimpleDateFormat(pattern, Locale.getDefault());
return format.format(date);
}
/**
* 将字符串转换成Date类型的时间
*
*
* @param s 日期类型的字符串
* datePattern :YYYY_MM_DD
* @return java.util.DateTest
*/
public static Date strToDate(String s, String pattern)
{
if (s == null)
{
return null;
}
Date date = null;
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
try
{
date = sdf.parse(s);
}
catch (ParseException | java.text.ParseException e)
{
e.printStackTrace();
}
return date;
}
}
}
3.在controller层接收传递过来的excel文件参数
UseEnergyDataDetailsDto实体类
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.Getter;
import lombok.Setter;
import java.io.Serializable;
@Getter
@Setter
public class UseEnergyDataDetailsVo implements Serializable {
private static final long serialVersionUID = 1L;
@TableId(value = "id", type = IdType.AUTO)
private Integer id;
private String workName;
private String stationName;
private String deviceNum;
private String consumptionType;
private Long consumptionNum;
private Boolean deleted;
}
controller层调用
@PostMapping(value = "dateImport")
public Result useEnergyDateImport(@RequestParam(value = "gasDataFile", required = false) MultipartFile gasDataFile){
try {
//调用工具类ImportExeclUtil
ImportExeclUtil readExcelUtil = new ImportExeclUtil();
//读取传入excel文件中的行，类型为List>
List<List<String>> gasRead = readExcelUtil.read(gasDataFile.getInputStream(), true);
if (CollectionUtils.isNotEmpty(gasRead)) {
//记录非空，即有数据，将读取到的List>类型的数据以流的形式转换为List
List<UseEnergyDataDetailsDto> gasList = gasRead.stream().map(e -> {
UseEnergyDataDetailsDto gas = new UseEnergyDataDetailsDto();
gas.setWorkName(e.get(0));
gas.setStationName(e.get(2));
gas.setDeviceNum("加热炉");
gas.setConsumptionType("用气");
gas.setConsumptionNum(Long.valueOf(e.get(18)));
return gas;
}).collect(Collectors.toList());
//可采用filter过滤一些数据
// List gasListDto = gasList.stream().filter(gas -> gas.getStationName() != null && !gas.getStationName().equals("")).collect(Collectors.toList());
}else{
//excel文件里数据为空，返回提示信息
}
//将得到的gasList数据存入数据库，调用mp的saveBatch批量新增（省略Service、mapper层代码）
iUseEnergyDataDetailsService.saveBatch(gasList);