一、应用场景
excel文件中的数据导入到数据库当中
二、代码
- 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>
这里尽量保持版本一致,否则可能会发生冲突。我使用5.0.0版本的poi、poi-ooxml与4.1.2版本的poi-ooxml-schemas产生了冲突问题。
2.实现方法
import cn.hutool.core.io.IoUtil;
import cn.hutool.poi.excel.ExcelUtil;
import cn.hutool.poi.excel.ExcelWriter;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.shandy.project.api.basic.vo.ExcelDataVo;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFColor;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.extensions.XSSFCellBorder;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.awt.Color;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigDecimal;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.List;
import java.util.*;
@Slf4j
public class ExcelExportUtil {
public static final String EXCEL_2003L = ".xls";
public static final String EXCEL_2007U = ".xlsx";
public static final String HEADER = "header";
public static List<List<Map<String, Object>>> getListByExcel(InputStream in, String fileName) throws Exception {
Workbook work = getWorkbook(in, fileName);
if (null == work) {
throw new Exception("创建Excel工作薄为空!");
}
Sheet sheet = null;
Row row = null;
Cell cell = null;
List<List<Map<String, Object>>> sheets = new ArrayList<>();
for (int i = 0; i < work.getNumberOfSheets(); i++) {
sheet = work.getSheetAt(i);
if (sheet == null) {
continue;
}
List<Map<String, Object>> page = new ArrayList();
List<String> headers = new ArrayList<>();
int start = -1;
for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) {
row = sheet.getRow(j);
if (row == null) {
continue;
}
if (start == -1) {
start = j;
}
Map<String, Object> rowMap = new HashMap<>();
for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {
cell = row.getCell(y);
if (cell == null) {
continue;
}
if (j == start) {
headers.add(getValue(cell));
} else {
rowMap.put(headers.get(y), getValue(cell));
}
}
if (rowMap.size() > 0) {
page.add(rowMap);
}
}
sheets.add(page);
}
return sheets;
}
public static Workbook getWorkbook(InputStream is, String fileName) throws Exception {
Workbook wb = null;
String fileType = fileName.substring(fileName.lastIndexOf("."));
if (Objects.equals(fileType, EXCEL_2003L)) {
wb = new HSSFWorkbook(is);
} else if (Objects.equals(fileType, EXCEL_2007U)) {
wb = new XSSFWorkbook(is);
} else {
throw new Exception("解析的文件格式有误!");
}
return wb;
}
}
public static String getValue(Cell cell) {
String value = "";
if (null == cell) {
return value;
}
switch (cell.getCellType()) {
case NUMERIC:
if (org.apache.poi.ss.usermodel.DateUtil.isCellDateFormatted(cell)) {
Date date = DateUtil.getJavaDate(cell.getNumericCellValue());
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
value = format.format(date);
;
} else {
BigDecimal big = new BigDecimal(cell.getNumericCellValue());
value = big.toString();
if (null != value && !"".equals(value.trim())) {
String[] item = value.split("[.]");
if (1 < item.length && "0".equals(item[1])) {
value = item[0];
}
}
}
break;
case STRING:
value = cell.getStringCellValue();
break;
case FORMULA:
value = String.valueOf(cell.getNumericCellValue());
if (value.equals("NaN")) {
value = cell.getStringCellValue();
}
break;
case BOOLEAN:
value = " " + cell.getBooleanCellValue();
break;
default:
value = cell.getStringCellValue();
}
if ("null".endsWith(value.trim())) {
value = "";
}
return value;
}
3.有图
现有如下1个包含2个sheet页的excel文件
sheet1表格
![在这里插入图片描述](https://img-blog.csdnimg.cn/ef68ec050bc74d07945a5c14adbc7965.png#pic_center)
sheet2表格
![在这里插入图片描述](https://img-blog.csdnimg.cn/291b2cad698046cf8c5bfb4abc5e672c.png#pic_center)
生成的数据格式:1个大集合,包含2个小集合,每个小集合里包含2个map。
[
[{"网站":"www.bd.com","邮箱":"b@139.com","电话":"13607467788"},{"网站":"www.ac.com", "邮箱":"a@139.COM", "电话":"15607468899"}],
[{"名称":"bp","分类":0, "logo文字":"连花清瘟", "logo地址":"中国"},{"名称":"gf","分类":1, "logo文字":"辣椒炒肉", "logo地址":"湖南"}]
]
一般不同的sheet所装的内容主题也不同,这样我们只需要对大数组里的每个小数组做不同的处理,在每个小数组里封装了map,map就是一行的记录,转化为java类就可以存入到数据库当中
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