Jakarta的POI项目提供了一组操纵Windows文档的Java API,如下几个类提供了操作Excel文件的方便的途径:HSSFWorkbook、HSSFSheet、HSSFRow、HSSFCell,分别代表了Excel电子表格中的Book、Sheet、行和单元格。
你可以在下面地址下载到最新的POI工具包:
http://jakarta.apache.org/poi/index.html
下面的代码创建一个Excel文件test.xls,并在第一行的第一格中写入一条消息:
import org.apache.poi.hssf.usermodel.*;
import java.io.FileOutputStream;
// code run against the jakarta-poi-1.5.0-FINAL-20020506.jar.
public class PoiTest {
static public void main(String[] args) throws Exception {
FileOutputStream fos = new FileOutputStream("d:/test.xls");
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet s = wb.createSheet();
wb.setSheetName(0, "first sheet");
HSSFRow row = s.createRow(0);
HSSFCell cell = row.createCell(0);
cell.setCellValue("Hello! This message is generated from POI.");
wb.write(fos);
fos.close();
}
}
读取Excel文件时,首先生存一个POIFSFileSystem对象,由POIFSFileSystem对象构造一个HSSFWorkbook,该HSSFWorkbook对象就代表了Excel文档。下面代码读取上面生成的Excel文件写入的消息字串:
POIFSFileSystem fs = null;
HSSFWorkbook wb = null;
try {
fs = new POIFSFileSystem(new FileInputStream("d:/test.xls"));
wb = new HSSFWorkbook(fs);
} catch (IOException e) {
e.printStackTrace();
}
HSSFSheet sheet = wb.getSheetAt(0);
HSSFRow row = sheet.getRow(0);
HSSFCell cell = row.getCell((short) 0);
String msg = cell.getStringCellValue();
另外一个例子:
import org.apache.poi.hssf.usermodel.*;
import java.io.FileOutputStream;
import java.io.IOException;
public class CreateCells
{
public static void main(String[] args)
throws IOException
{
HSSFWorkbook wb = new HSSFWorkbook();
//建立新HSSFWorkbook对象
HSSFSheet sheet = wb.createSheet("new sheet");
//建立新的sheet对象
// Create a row and put some cells in it.
Rows are 0 based.
HSSFRow row = sheet.createRow((short)0);
//建立新行
// Create a cell and put a value in it.
HSSFCell cell = row.createCell((short)0);
//建立新cell
cell.setCellvalue(1);//设置cell的整数类型的值
// Or do it on one line.
row.createCell((short)1).setCellvalue(1.2);
//设置cell浮点类型的值
row.createCell((short)2).setCellvalue("test");
//设置cell字符类型的值
row.createCell((short)3).setCellvalue(true);
//设置cell布尔类型的值
HSSFCellStyle cellStyle = wb.createCellStyle();
//建立新的cell样式
cellStyle.setDataFormat
(HSSFDataFormat.getFormat("m/d/yy h:mm"));
//设置cell样式为定制的日期格式
HSSFCell dCell =row.createCell((short)4);
dCell.setCellvalue(new Date());
//设置cell为日期类型的值
dCell.setCellStyle(cellStyle);
//设置该cell日期的显示格式
HSSFCell csCell =row.createCell((short)5);
csCell.setEncoding(HSSFCell.ENCODING_UTF_16);
//设置cell编码解决中文高位字节截断
csCell.setCellvalue("中文测试_Chinese Words Test");
//设置中西文结合字符串
row.createCell((short)6).setCellType
(HSSFCell.CELL_TYPE_ERROR);
//建立错误cell
// Write the output to a file
FileOutputStream fileOut =
new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
}
}
在Java中读写Excel文件
最新推荐文章于 2021-11-23 10:59:18 发布