【Java】使用Apache POI生成和解析Excel檔案
阿新 • • 發佈：2019-02-01
概述
Excel是我們平時工作中比較常用的用於儲存二維表資料的，JAVA也可以直接對Excel進行操作，分別有jxl和poi，2種方式。
程式碼
要使用poi，必須引入poi的jar包，maven依賴如下（最新包可參考mvn資訊）：
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.14</version>
</dependency>
<dependency 使用poi建立execl檔案
其中部分方法可以封裝，或者省略
package test.dzy.poi;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache 使用poi修改execl檔案
package test.dzy.poi;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.poi.EncryptedDocumentException;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
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.usermodel.WorkbookFactory;
public class UpdateExcel {
public static void main(String[] args) throws EncryptedDocumentException, InvalidFormatException, IOException {
InputStream inputStream = new FileInputStream("G:/workbook.xls");
//InputStream inp = new FileInputStream("workbook.xlsx");
Workbook workbook = WorkbookFactory.create(inputStream);
Sheet sheet = workbook.getSheetAt(0);
Row row = sheet.getRow(2);
Cell cell = row.getCell(3);
if (cell == null)
cell = row.createCell(3);
cell.setCellType(Cell.CELL_TYPE_STRING);
cell.setCellValue("a test");
// 寫操作
FileOutputStream fileOut = new FileOutputStream("C:/Users/H__D/Desktop/workbook.xls");
workbook.write(fileOut);
fileOut.close();
}
}
使用poi解析excel檔案
package test.dzy.poi;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.poi.EncryptedDocumentException;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.ss.usermodel.DateUtil;
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.usermodel.WorkbookFactory;
import org.apache.poi.ss.util.CellReference;
import com.microsoft.schemas.office.visio.x2012.main.CellType;
public class ReadExcel {
public static void main(String[] args) throws EncryptedDocumentException, InvalidFormatException, IOException {
InputStream inputStream = new FileInputStream("C:/Users/H__D/Desktop/workbook.xls");
//InputStream inp = new FileInputStream("C:/Users/H__D/Desktop/workbook.xls");
Workbook workbook = WorkbookFactory.create(inputStream);
Sheet sheet = workbook.getSheetAt(0);
DataFormatter formatter = new DataFormatter();
for (Row row : sheet) {
for (Cell cell : row) {
CellReference cellRef = new CellReference(row.getRowNum(), cell.getColumnIndex());
//單元格名稱
System.out.print(cellRef.formatAsString());
System.out.print(" - ");
//通過獲取單元格值並應用任何資料格式（Date，0.00，1.23e9，$ 1.23等），獲取單元格中顯示的文字
String text = formatter.formatCellValue(cell);
System.out.println(text);
//獲取值並自己格式化
switch (cell.getCellType()) {
case Cell.CELL_TYPE_STRING:// 字串型
System.out.println(cell.getRichStringCellValue().getString());
break;
case Cell.CELL_TYPE_NUMERIC:// 數值型
if (DateUtil.isCellDateFormatted(cell)) { // 如果是date型別則 ，獲取該cell的date值
System.out.println(cell.getDateCellValue());
} else {// 純數字
System.out.println(cell.getNumericCellValue());
}
break;
case Cell.CELL_TYPE_BOOLEAN:// 布林
System.out.println(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_FORMULA:// 公式型
System.out.println(cell.getCellFormula());
break;
case Cell.CELL_TYPE_BLANK:// 空值
System.out.println();
break;
case Cell.CELL_TYPE_ERROR: // 故障
System.out.println();
break;
default:
System.out.println();
}
}
}
}
}