使用POI生成Excel文件，可以自动调整excel列宽等

//autoSizeColumn()方法自动调整excel列宽

importjava.io.FileOutputStream;

importorg.apache.poi.hssf.usermodel.HSSFCell;
importorg.apache.poi.hssf.usermodel.HSSFCellStyle;
importorg.apache.poi.hssf.usermodel.HSSFFont;
importorg.apache.poi.hssf.usermodel.HSSFRow;
importorg.apache.poi.hssf.usermodel.HSSFSheet;
importorg.apache.poi.hssf.usermodel.HSSFWorkbook;
importorg.apache.poi.hssf.usermodel.HSSFRichTextString;
importorg.apache.poi.hssf.usermodel.HSSFDataFormat;
importorg.apache.poi.hssf.usermodel.HSSFComment;
importorg.apache.poi.hssf.usermodel.HSSFPatriarch;
importorg.apache.poi.hssf.usermodel.HSSFClientAnchor;

publicclassPoiCreateExcelTest {
    publicstaticvoidmain(String[] args) {
        /**
          * @see<a href="http://poi.apache.org/hssf/quick-guide.html#NewWorkbook">For more</a>
         */        
        //创建新的Excel 工作簿
         HSSFWorkbook workbook =newHSSFWorkbook();
        
        //在Excel工作簿中建一工作表，其名为缺省值, 也可以指定Sheet名称
         HSSFSheet sheet =workbook.createSheet();
        //HSSFSheet sheet = workbook.createSheet("SheetName");
        
        //用于格式化单元格的数据
         HSSFDataFormat format =workbook.createDataFormat();
        
        //创建新行(row),并将单元格(cell)放入其中. 行号从0开始计算.
         HSSFRow row =sheet.createRow((short) 1);

        //设置字体
         HSSFFont font =workbook.createFont();
         font.setFontHeightInPoints((short) 20); //字体高度
         font.setColor(HSSFFont.COLOR_RED); //字体颜色
         font.setFontName("黑体"); //字体
         font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //宽度
         font.setItalic(true); //是否使用斜体
//         font.setStrikeout(true); //是否使用划线

        //设置单元格类型
         HSSFCellStyle cellStyle =workbook.createCellStyle();
         cellStyle.setFont(font);
         cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); //水平布局：居中
         cellStyle.setWrapText(true);
        
        //添加单元格注释
        //创建HSSFPatriarch对象,HSSFPatriarch是所有注释的容器.
         HSSFPatriarch patr =sheet.createDrawingPatriarch();
        //定义注释的大小和位置,详见文档
         HSSFComment comment =patr.createComment(newHSSFClientAnchor(0, 0, 0, 0, (short)4, 2, (short) 6, 5));
        //设置注释内容
         comment.setString(newHSSFRichTextString("可以在POI中添加注释！"));
        //设置注释作者. 当鼠标移动到单元格上是可以在状态栏中看到该内容.
         comment.setAuthor("Xuys.");
        
        //创建单元格
         HSSFCell cell =row.createCell((short) 1);
         HSSFRichTextString hssfString =newHSSFRichTextString("Hello World!");
         cell.setCellValue(hssfString);//设置单元格内容
         cell.setCellStyle(cellStyle);//设置单元格样式
         cell.setCellType(HSSFCell.CELL_TYPE_STRING);//指定单元格格式：数值、公式或字符串
         cell.setCellComment(comment);//添加注释

        //格式化数据
         row =sheet.createRow((short) 2);
         cell =row.createCell((short) 2);
         cell.setCellValue(11111.25);
         cellStyle =workbook.createCellStyle();
         cellStyle.setDataFormat(format.getFormat("0.0"));
         cell.setCellStyle(cellStyle);

         row =sheet.createRow((short) 3);
         cell =row.createCell((short) 3);
         cell.setCellValue(9736279.073);
         cellStyle =workbook.createCellStyle();
         cellStyle.setDataFormat(format.getFormat("#,##0.0000"));
         cell.setCellStyle(cellStyle);
        
        
         sheet.autoSizeColumn((short)0); //调整第一列宽度
         sheet.autoSizeColumn((short)1); //调整第二列宽度
         sheet.autoSizeColumn((short)2); //调整第三列宽度
         sheet.autoSizeColumn((short)3); //调整第四列宽度

        try{
             FileOutputStream fileOut =newFileOutputStream("C:\3.xls");
             workbook.write(fileOut);
             fileOut.close();
         }catch(Exception e) {
             System.out.println(e.toString());
         }
     }

}

原文地址：http://doggou.iteye.com/blog/198631