1.創建Maven項目在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 int rownum = sheet.getPhysicalNumberOfRows(); //獲取最大列數 int colnum = row.getPhysicalNumberOfCells(); for (int i = 0; i < rownum; i++) { //獲取第i行數據 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.報錯

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

poi導入excel表格數據時報java.lang.IllegalStateException: Cannot get a STRING value from a NUMERIC cell異常是因為在讀取cell單元格字符串時，有number類型的數據，因此需要把它轉化為純String類型，這樣就不會報錯了。報錯的地方類似于這樣。

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

在number類型轉化為String類型的過程中造成了Cannot get a STRING value from a NUMERIC cell這樣的問題，因此需要在讀取excel單元格數據轉化之前設置單元格類型為String，代碼如下。

//獲取單元格XSSFCell cell = row.getCell(0);//設置單元格類型cell.setCellType(CellType.STRING);//獲取單元格數據String cellValue = cell.getStringCellValue();

3.2 poi導出Excel報錯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$Factoryat org.apache.poi.xssf.usermodel.XSSFWorkbook.onWorkbookCreate(XSSFWorkbook.java:436)at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:238)at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:229)at exportexcel.BuildXLSX.main(BuildXLSX.java:35)Caused by: java.lang.ClassNotFoundException: org.openxmlformats.schemas.spreadsheetml.x2006.main.CTWorkbook$Factoryat 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

錯誤原因：

未導入poi-ooxml-schema jar包。我使用的是poi-3.15 , 應該是poi-ooxml-schemas-3.15.jar包

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