row = sheet.createRow(i+1);            HSSFCellStyle cellStyle = wb.createCellStyle();            cellStyle.setWrapText(true);            row.setRowStyle(cellStyle);

制定某一列的宽度：需要是256的倍数

默认的宽度，不需要，很奇怪

// 第一步，创建一个webbook，对应一个Excel文件        if(wb == null){            wb = new HSSFWorkbook();        }        // 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet        HSSFSheet sheet = wb.createSheet(sheetName);        sheet.setDefaultColumnWidth(20);        sheet.setColumnWidth(0,5120);        sheet.setColumnWidth(1,5120);        sheet.setColumnWidth(2,25600);        sheet.setColumnWidth(3,10240);        sheet.setColumnWidth(4,2560);        sheet.setColumnWidth(5,2560);        sheet.setColumnWidth(6,2560);        sheet.setColumnWidth(7,2560);        // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short        HSSFRow row = sheet.createRow(0);        // 第四步，创建单元格，并设置值表头 设置表头居中        HSSFCellStyle style = wb.createCellStyle();        style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式        //设置超链接的字体和颜色        hlink_style = wb.createCellStyle();        HSSFFont hlink_font = wb.createFont();        hlink_font.setUnderline(HSSFFont.U_SINGLE);        hlink_font.setColor(HSSFColor.BLUE.index);        hlink_style.setFont(hlink_font);        //设置大的标题的字体        bigFontstyle = wb.createCellStyle();        HSSFFont big_font = wb.createFont();        big_font.setFontHeight((short)256);        bigFontstyle.setFont(big_font);        //设置大的红色标题的字体        bigRedFontStyle = wb.createCellStyle();        HSSFFont big_red_font = wb.createFont();        big_red_font.setFontHeight((short)256);        big_red_font.setColor(HSSFColor.RED.index);        bigRedFontStyle.setFont(big_red_font);        //绿色的working标记的字体        greenFontStyle = wb.createCellStyle();        HSSFFont green_font = wb.createFont();        green_font.setColor(HSSFColor.GREEN.index);        greenFontStyle.setFont(green_font);        //红色的working标记的字体        redFontStyle = wb.createCellStyle();        HSSFFont red_font = wb.createFont();        red_font.setColor(HSSFColor.RED.index);        redFontStyle.setFont(red_font);        HSSFCell cell = null;        //创建标题        for(int i=0;i<title.length;i++){            cell = row.createCell(i);            cell.setCellValue(title[i]);            cell.setCellStyle(style);        }

参考：

371805.html

HSSFCell 设立样式

提问者： xuxinliang 发布时间：2014-05-10 浏览：293 回复：0 悬赏：0.0希赛币

HSSFCell 设置样式
1、遍历workbook
// load源文件
POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(filePath));
HSSFWorkbook wb = new HSSFWorkbook(fs);
for (int i = 0; i < wb.getNumberOfSheets(); i++) {
HSSFSheet sheet = wb.getSheetAt(i);
for (int j = sheet.getFirstRowNum(); j < sheet.getLastRowNum(); j++) {
    HSSFRow row = sheet.getRow(j);
    if (row != null) {
      // 。。。操作}
    }
}
}
// 目标文件
FileOutputStream fos = new FileOutputStream(objectPath);
// 写文件
wb.write(fos);
fos.close();

2、得到列和单元格
HSSFRow row = sheet.getRow(i);
HSSFCell cell = row.getCell((short) j);

3、设置sheet名称和单元格内容为中文
wb.setSheetName(n, "中文",HSSFCell.ENCODING_UTF_16);
cell.setEncoding((short) 1);
cell.setCellValue("中文");

4、单元格内容未公式或数值，可以这样读写
cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
cell.getNumericCellValue();

5、设置列宽、行高
sheet.setColumnWidth((short)column,(short)width);
row.setHeight((short)height);

6、添加区域，合并单元格
Region region = new Region((short)rowFrom,(short)columnFrom,(short)rowTo,(short)columnTo);
sheet.addMergedRegion(region);
//得到所有区域
sheet.getNumMergedRegions() ;

7、常用方法
根据单元格不同属性返回字符串数值
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;
}

8、常用单元格边框格式

虚线HSSFCellStyle.BORDER_DOTTED
实线HSSFCellStyle.BORDER_THIN
public static HSSFCellStyle getCellStyle(short type) {
HSSFWorkbook wb = new HSSFWorkbook();
HSSFCellStyle style = wb.createCellStyle();
style.setBorderBottom(type);// 下边框
style.setBorderLeft(type);// 左边框
style.setBorderRight(type);// 右边框
style.setBorderTop(type);// 上边框
return style;
}

9、设置字体和内容位置
HSSFFont f = wb.createFont();
f.setFontHeightInPoints((short) 11);// 字号
f.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);// 加粗
style.setFont(f);
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 左右居中
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
style.setRotation(short rotation);// 单元格内容的旋转的角度
HSSFDataFormat df = wb.createDataFormat();
style1.setDataFormat(df.getFormat("0.00%"));// 设置单元格数据格式
cell.setCellFormula(string);// 给单元格设公式
style.setRotation(short rotation);// 单元格内容的旋转的角度
cell.setCellStyle(style);

10、插入图片
// 先把读进来的图片放到一个ByteArrayOutputStream中，以便产生ByteArray
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
BufferedImage bufferImg = ImageIO.read(new File("ok.jpg"));
ImageIO.write(bufferImg, "jpg", byteArrayOut);
// 读进一个excel模版
FileInputStream fos = new FileInputStream(filePathName + "/stencil.xlt");
fs = new POIFSFileSystem(fos);
// 创建一个工作薄
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 1023, 255, (short) 0, 0, (short) 10, 10);
patriarch.createPicture(anchor, wb.addPicture(byteArrayOut.toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));

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java excel设置row 里面的宽度自适应

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HSSFCell 设立样式

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