org.apache.poi.poifs.filesystem.OfficeXmlFileException: The supplied data appears to be in the Offic

org.apache.poi.poifs.filesystem.OfficeXmlFileException: The supplied data appears to be in the Office 2007+ XML. 
You are calling the part of POI that deals with OLE2 Office Documents. You need to call a different part of POI to process this data (eg XSSF instead of HSSF)

緣由是：
HSSFWorkbook:是操做Excel2003之前（包括2003）的版本，擴展名是.xls 
XSSFWorkbook:是操做Excel2007的版本，擴展名是.xlsx

<!--處理2003 excel-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.16</version>
        </dependency>
        <!--處理2007 excel-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.16</version>
        </dependency>

在使用POI讀取Excel文件內容時，發生了異常，報錯以下：

java.lang.IllegalStateException: Cannot get a STRING value from a NUMERIC cell  異常怎麼辦?

大概意思是不能從一個數值的列獲取一個字符串類型的值，我使用下面的代碼來獲取單元格的值：

解決

解決方法是在讀取某單元格時，使用setCellType()方法先將該單元格的類型設置爲STRING，代碼以下：

 cell.setCellType(CellType.STRING);
                String stringCellValue = cell.getStringCellValue();

 

poi建立excel 和讀取excel  (2003版本)

建立

import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.junit.Test;

import java.io.FileOutputStream;
import java.io.IOException;

public class ordingTest {

    @Test
    public void createOrding() throws IOException {
        HSSFWorkbook work = new HSSFWorkbook();
        HSSFSheet mysheet = work.createSheet("mysheet");
        HSSFRow row = mysheet.createRow(0);
        HSSFRow row2 = mysheet.createRow(1);
        HSSFRow row3 = mysheet.createRow(2);

        row.createCell(0).setCellValue("name");
        row.createCell(1).setCellValue("age");
        row.createCell(2).setCellValue("adress");

        row2.createCell(0).setCellValue("張三");
        row2.createCell(1).setCellValue(13);
        row2.createCell(2).setCellValue("上海");


        row3.createCell(0).setCellValue("李四");
        row3.createCell(1).setCellValue(16);
        row3.createCell(2).setCellValue("北京");

        FileOutputStream fileOutputStream = new FileOutputStream("E:\\hello.xls");
        work.write(fileOutputStream);
        fileOutputStream.flush();
        work.close();
        fileOutputStream.close();
    }

}

 

讀取:

import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Row;
import org.junit.Test;

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

public class ordingTest2 {
    @Test
    public void reading() throws IOException {
        InputStream inputStream = new FileInputStream("E:\\hello.xls") {
        };
        HSSFWorkbook sheets = new HSSFWorkbook(inputStream);

        HSSFSheet sheetAt = sheets.getSheetAt(0);

        for (Row cells : sheetAt) {
            for (Cell cell : cells) {
                cell.setCellType(CellType.STRING);
                String stringCellValue = cell.getStringCellValue();
                System.out.println("stringCellValue = " + stringCellValue);
            }

        }
        sheets.close();
    }
}

第二中讀取方法:

/*從最後一行讀取,起始索引0*/        int lastRowNum = sheetAt.getLastRowNum();        for (int i = 0; i <=lastRowNum ; i++) {            HSSFRow row = sheetAt.getRow(i);            short lastCellNum = row.getLastCellNum();            for (int j = 0; j < lastCellNum; j++) {                HSSFCell cell = row.getCell(j);                cell.setCellType(CellType.STRING);                String stringCellValue = cell.getStringCellValue();                System.out.println("stringCellValue = " + stringCellValue);            }        }