java 导出数据到excel 之 WritableWorkbook

此段代码用于生成excel文件
*/
WritableWorkbook book= Workbook.createWorkbook(new File(application.getRealPath("/")+"price.xls"));
//生成名为"第一页"的工作表，参数0表示这是第一页
WritableSheet sheet=book.createSheet("第一页",0);
//在Label对象的构造子中指名单元格位置是第一列第一行(0,0)
WritableFont font1= new WritableFont(WritableFont.TIMES,14,WritableFont.BOLD);
WritableCellFormat format1=new WritableCellFormat(font1);
format1.setAlignment(jxl.format.Alignment.CENTRE);//设置为居中
sheet.setColumnView(1,20);//设置第1列宽度，6cm左右
sheet.mergeCells(0,0,7,0);
Label label=new Label(0,0,"统计报表",format1);

//将定义好的单元格添加到工作表中
sheet.addCell(label);
//将定义好的单元格添加到工作表中
WritableFont font2=new WritableFont(WritableFont.createFont("楷体_GB2312"),10,WritableFont.NO_BOLD );
WritableCellFormat format2=new WritableCellFormat(font2);
format2.setAlignment(jxl.format.Alignment.CENTRE);//设置为居中
//设置边框
format2.setBorder(jxl.format.Border.ALL,jxl.format.BorderLineStyle.NONE);
label=new Label(0,2,"编号",format2);
sheet.addCell(label);
label=new Label(1,2,"采集日期",format2);
sheet.addCell(label);
label=new Label(2,2,"采集点",format2);
sheet.addCell(label);
label=new Label(3,2,"品种",format2);
sheet.addCell(label);
label=new Label(4,2,"种类",format2);
sheet.addCell(label);
label=new Label(5,2,"品种说明",format2);
sheet.addCell(label);
label=new Label(6,2,"最高价",format2);
sheet.addCell(label);
label=new Label(7,2,"最低价",format2);
sheet.addCell(label);
label=new Label(8,2,"平均价",format2);
sheet.addCell(label);
label=new Label(9,2,"状态",format2);
sheet.addCell(label);
/*生成一个保存数字的单元格
必须使用Number的完整包路径，否则有语法歧义
单元格位置是第二列，第一行，值为789.123
jxl.write.Number number = new jxl.write.Number(2,0,789.123);
sheet.addCell(number); */
RowSet rs_info =null;
Row row_info =null;
DecimalFormat df_price=new java.text.DecimalFormat("#0.0");
int count_zs=0;//信息提交总数
int count_yx=0;//信息有效数
String format="";
where="";
jxl.write.Number number=null;
for (int i = 0; i <rs_price.getRowCount(); i++)
{
row_price=rs_price.getRow(i);

number = new jxl.write.Number(0,i+3,i+1,format2);
sheet.addCell(number);
label=new Label(1,i+3,row_price.getFieldValue("collection_date"),format2);
sheet.addCell(label);
label=new Label(2,i+3,row_price.getFieldValue("point_name"),format2);
sheet.addCell(label);
label=new Label(3,i+3,row_price.getFieldValue("type_parent_name"),format2);
sheet.addCell(label);
label=new Label(4,i+3,row_price.getFieldValue("type_name"),format2);
sheet.addCell(label);
label=new Label(5,i+3, row_price.getFieldValue("type_desc"),format2);
sheet.addCell(label);
number=new jxl.write.Number(6,i+3,44.9 ,format2);
sheet.addCell(number);
number=new jxl.write.Number(7,i+3,  33 ,format2);
sheet.addCell(number);
number=new jxl.write.Number(8,i+3, Double.parseDouble(row_price.getFieldValue("price_avg").toString())  ,format2);
sheet.addCell(number);
label=new Label(9,i+3,  row_price.getFieldValue("state") ,format2);
sheet.addCell(label);
}
book.write();
book.close();
SmartUpload su = new SmartUpload();// 新建一个SmartUpload对象
su.initialize(pageContext);// 初始化
/* 设定contentDisposition为null以禁止浏览器自动打开文件，
保证点击链接后是下载文件。若不设定，则下载的文件扩展名为
doc时，浏览器将自动用word打开它。扩展名为pdf时，
浏览器将用acrobat打开。*/
su.setContentDisposition(null);
// 下载文件
su.downloadFile("price.xls");
out.clear();
out = pageContext.pushBody();
File f=new File(application.getRealPath("/")+"price.xls");
//	 f.delete();
flag=false;
}else{
response.sendRedirect("./price_auditing.jsp");
}
}
catch (Exception e)
{
System.out.println("错误："+e);
session.setAttribute(Tools.ERROR_INFO,"服务器内部错误！");
session.setAttribute(Tools.DEST_URL,"price/type_excel.jsp");   //这里要使用绝对地址
response.sendRedirect(Tools.ERROR_PAGE);   //转到错误提醒页面
}
%>

try {
Workbook book = Workbook.getWorkbook(new File(" test.xls "));
int num = book.getNumberOfSheets();
for (int a = 0; a < num; a++) {
// 获得第a个工作表对象
Sheet sheet = book.getSheet(a);
int columnum = sheet.getColumns(); // 得到列数
int rownum = sheet.getRows(); // 得到行数
System.out.println(columnum);
System.out.println(rownum);
for (int i = 0; i < rownum; i++) // 循环进行读写
{
for (int j = 0; j < columnum; j++) {
Cell cell1 = sheet.getCell(j, i);
String result = cell1.getContents();
System.out.print(result);
System.out.print(" /t ");
}
System.out.println();
}
}
book.close();
} catch (Exception e) {
System.out.println(e);
}