用POI可以生成excel文件,基本用法較簡單，使用如下：
public class App {
public static void main(String[] args) {
try {
HSSFWorkbook wb = new HSSFWorkbook();
//創建sheet
HSSFSheet sheet = wb.createSheet("first sheet");
wb.createSheet("second sheet");
//創建row
HSSFRow row = sheet.createRow(0);
//創建單元格並設置單元格值
row.createCell(0).setCellValue(false);// boolean
row.createCell(1).setCellValue(Calendar.getInstance());//日曆
row.createCell(2).setCellValue(new Date());//date
row.createCell(3).setCellValue(123456789.9876543);//double
//string
row.createCell(4).setCellValue(new HSSFRichTextString("文本"));
//對數據進行格式化顯示
HSSFCell cell = row.getCell(1);
//通過workbook創建數據格式對象
HSSFDataFormat format = wb.createDataFormat();
//通過workbook創建單元格樣式對象
HSSFCellStyle style = wb.createCellStyle();
//設置數據格式
style.setDataFormat(format.getFormat("yyyy-MM-dd hh:mm:ss"));
//設置單元格的樣式對象
cell.setCellStyle(style);
row.getCell(2).setCellStyle(style);
style = wb.createCellStyle();
style.setDataFormat(format.getFormat("#,###.0000"));
row.getCell(3).setCellStyle(style);
//設置列寬 1 = 1/20 ()
sheet.setColumnWidth(1, 6000);
sheet.autoSizeColumn((short)2);//設置自動列寬
//操縱文本
row = sheet.createRow(1);
row.createCell(0).setCellValue(new HSSFRichTextString("左下"));
row.createCell(1).setCellValue(new HSSFRichTextString("中中"));
row.createCell(2).setCellValue(new HSSFRichTextString("右上"));
//設置文本的對齊方式
cell = row.getCell(0);
style = wb.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_LEFT);//左對齊
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_BOTTOM);//下對齊
cell.setCellStyle(style);
cell = row.getCell(1);
style = wb.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//下對齊
cell.setCellStyle(style);
cell = row.getCell(2);
style = wb.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_RIGHT);//左對齊
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_TOP);//下對齊
cell.setCellStyle(style);
row.setHeightInPoints(50);//設置行高
//設置文本旋轉
cell = row.getCell(0);
style = cell.getCellStyle();
style.setRotation((short)30);
//設置字體和顏色
HSSFFont font = wb.createFont();
font.setFontName("宋體");
font.setFontHeight((short)300);
font.setColor(HSSFColor.RED.index);
style.setFont(font);
//設置文本回繞
String str =
"dddddddddsdfasfdoiuretjijrtlwjertlkwej;lkouifdiudugsfd" ;
cell = row.createCell(3);
cell.setCellValue(new HSSFRichTextString(str));
style = wb.createCellStyle();
style.setWrapText(true);
cell.setCellStyle(style);
//設置邊框的特效
row = sheet.createRow(2);
cell = row.createCell(0);
style = wb.createCellStyle();
style.setBorderTop(HSSFCellStyle.BORDER_DOUBLE);
style.setTopBorderColor(HSSFColor.GREEN.index);
cell.setCellStyle(style);
cell = row.createCell(1);
style = wb.createCellStyle();
style.setRightBorderColor(HSSFColor.RED.index);
style.setBorderRight(HSSFCellStyle.BORDER_MEDIUM_DASH_DOT_DOT);
FileOutputStream fos = new FileOutputStream("d:/pio.xls");
cell.setCellStyle(style);
//創建計算列
row = sheet.createRow(3);
row.createCell(0).setCellValue(13);
row.createCell(1).setCellValue(15);
row.createCell(2).setCellValue(17);
cell = row.createCell(3);
cell.setCellFormula("average(A4:C4)");
//移動行
//sheet.shiftRows(1, 3, 2);
//拆分窗口
//1000:x軸拆分距離 2000:y軸拆分距離 2:右側窗格從第幾列開始顯示
// 3:下端窗格從第幾行開始顯示 1:激活的窗格
//sheet.createSplitPane(1000, 2000, 2, 3, 1);
//凍結窗口
//1:列的凍結數量 2:行的凍結數量 3:右側窗格從第幾列開始顯示
//4:下端窗格從第幾行開始顯示
sheet.createFreezePane(1, 2, 3, 4);
wb.write(fos);
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}