JavaPoi的使用操作excel的框架
POI是java用来操作windows文档的一个框架。通过HSSF可以用java来操作excel的读写。我记得我毕业的第一个项目就是用POI来做的。呵呵。
下面是一个用poi读写excel的列子
public class PoiTest {
public static void main(String args[]){
try {
//readSheet();
writeSheet();
} catch (IOException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
}
public static void readSheet() throws IOException {
POIFSFileSystem fs=new POIFSFileSystem(new FileInputStream("d:\\test.xls"));
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
HSSFRow row = sheet.getRow(0);
HSSFCell cell = row.getCell((short) 0);
String msg = cell.getStringCellValue();
System.out.println(msg);
}
public static void writeSheet() throws IOException {
POIFSFileSystem fs=new POIFSFileSystem(new FileInputStream("d:\\test.xls"));
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
HSSFRow row = sheet.getRow(0);
HSSFCell cell = row.getCell((short)0);
cell.setCellValue("a test");
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("d:\\test.xls");
wb.write(fileOut);
fileOut.close();
}
} 下面是一些其他的测试方法：
public static void test() throws IOException {
POIFSFileSystem fs=new POIFSFileSystem(new FileInputStream("d:\\test.xls"));
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
HSSFRow row = sheet.getRow(0);
HSSFCell cell = row.getCell((short)0);
//设置sheet名称
wb.setSheetName(0, "中文");
//设置宽度
sheet.setColumnWidth(0,(short)1000);
//设置高度
row.setHeight((short)1000);
//设置内容
cell.setCellValue("中文");
Region region = new Region((short)0,(short)0,(short)2,(short)2);
sheet.addMergedRegion(region);
//得到所有区域
sheet.getNumMergedRegions();
//设置字体和样式
HSSFFont f = wb.createFont();
f.setFontHeightInPoints((short) 11);//字号
f.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);//加粗
HSSFCellStyle style = wb.createCellStyle();
style.setFont(f);
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);//左右居中
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//上下居中
style.setRotation((short)0);//单元格内容的旋转的角度
//HSSFDataFormat df = wb.createDataFormat();
//style.setDataFormat(df.getFormat("0.00%"));//设置单元格数据格式
//cell.setCellFormula(string);//给单元格设公式
cell.setCellStyle(style);
FileOutputStream fileOut = new FileOutputStream("d:\\test.xls");
wb.write(fileOut);
fileOut.close();
}
下面是根据单元格的样式来获取内容
public String getCellStringValue(HSSFCell cell) {
String cellValue = "";
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_STRING:
cellValue = cell.getStringCellValue();
if(cellValue.trim().equals("")||cellValue.trim().length()<=0)
cellValue=" ";
break;
case HSSFCell.CELL_TYPE_NUMERIC:
cellValue = String.valueOf(cell.getNumericCellValue());
break;
case HSSFCell.CELL_TYPE_FORMULA:
cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
cellValue = String.valueOf(cell.getNumericCellValue());
break;
case HSSFCell.CELL_TYPE_BLANK:
cellValue=" ";
break;
case HSSFCell.CELL_TYPE_BOOLEAN:
break;
case HSSFCell.CELL_TYPE_ERROR:
break;
default:
break;
}
return cellValue;
}
其中的excel的结构及常用类如下：
HSSFWorkbook excell 文档对象介绍 HSSFSheet excell的表单 HSSFRow excell的行 HSSFCell excell的格子单元 HSSFFont excell字体 HSSFName 名称 HSSFDataFormat 日期格式 HSSFHeader sheet头 HSSFFooter sheet尾 HSSFCellStyle cell样式 HSSFDateUtil 日期 HSSFPrintSetup 打印 HSSFErrorConstants 错误信息表
参考文档：http://ltc603.iteye.com/blog/30184
http://ltc603.iteye.com/blog/30040
总结一下，poi是java来操作excel的工具，其中要熟悉各种对象对应的excel的结构。