1.創(chuàng)建Maven項(xiàng)目在pom文件中添加依賴

<dependencies>
    <!-- 舊的 .xls -->
    <!--<dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>poi</artifactId>
      <version>3.17</version>
    </dependency>-->
    <!-- 新的 .xlsx -->
    <dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>poi-ooxml</artifactId>
      <version>3.17</version>
    </dependency>
  </dependencies>

2.編寫(xiě)代碼

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.FileInputStream;
import java.io.IOException;

public class PoiTest {
  public static void main(String[] args) throws IOException {
    FileInputStream is = new FileInputStream("src/main/resources/test.xlsx");
    XSSFWorkbook workbook = new XSSFWorkbook(is);
    //讀取Sheet
    Sheet sheet = workbook.getSheetAt(0);
    Row row = sheet.getRow(0);
    //獲取最大行數(shù)
    int rownum = sheet.getPhysicalNumberOfRows();
    //獲取最大列數(shù)
    int colnum = row.getPhysicalNumberOfCells();
    for (int i = 0; i < rownum; i++) {
      //獲取第i行數(shù)據(jù)
      row = sheet.getRow(i);
      for (int j = 0; j < colnum; j++) {
        Cell cell = row.getCell(j);
        cell.setCellType(CellType.STRING);
        String cellText = cell.getStringCellValue();
        System.out.print(cellText + "\t");
      }
      System.out.println();
    }
  }
}

3.報(bào)錯(cuò)

3.1 異常解決Cannot get a STRING value from a NUMERIC cell poi

poi導(dǎo)入excel表格數(shù)據(jù)時(shí)報(bào)java.lang.IllegalStateException: Cannot get a STRING value from a NUMERIC cell異常是因?yàn)樵谧x取cell單元格字符串時(shí)，有number類型的數(shù)據(jù)，因此需要把它轉(zhuǎn)化為純String類型，這樣就不會(huì)報(bào)錯(cuò)了。
報(bào)錯(cuò)的地方類似于這樣。

//獲取單元格
XSSFCell cell = row.getCell(0);
//獲取單元格數(shù)據(jù)
String cellValue = cell.getStringCellValue();

在number類型轉(zhuǎn)化為String類型的過(guò)程中造成了Cannot get a STRING value from a NUMERIC cell這樣的問(wèn)題，因此需要在讀取excel單元格數(shù)據(jù)轉(zhuǎn)化之前設(shè)置單元格類型為String，代碼如下。

//獲取單元格
XSSFCell cell = row.getCell(0);
//設(shè)置單元格類型
cell.setCellType(CellType.STRING);
//獲取單元格數(shù)據(jù)
String cellValue = cell.getStringCellValue();

3.2 poi導(dǎo)出Excel報(bào)錯(cuò)java.lang.NoClassDefFoundError: org/openxmlformats/schemas/spreadsheetml/x2006/main/CTWorkbook$Factoryat

Exception in thread "main" java.lang.NoClassDefFoundError: org/openxmlformats/schemas/spreadsheetml/x2006/main/CTWorkbook$Factoryat org.apache.poi.xssf.usermodel.XSSFWorkbook.onWorkbookCreate(XSSFWorkbook.java:436)
at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:238)
at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:229)
at exportexcel.BuildXLSX.main(BuildXLSX.java:35)
Caused by: java.lang.ClassNotFoundException: org.openxmlformats.schemas.spreadsheetml.x2006.main.CTWorkbook$Factory
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 4 more

錯(cuò)誤原因：

未導(dǎo)入poi-ooxml-schema jar包。我使用的是poi-3.15 , 應(yīng)該是poi-ooxml-schemas-3.15.jar包

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