java excel设置row 里面的宽度自适应

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

// 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);
        }

http://www.educity.cn/wenda/371805.html 

HSSFCell 设立样式

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));