Excel导出数据库中数据的方法：
1. 从数据库中取出将要导出的数据，放在list中
2. 得到模板
3. 循环迭代list中的数据，然后生成一列（row）中的数据，迭代完一个对象后，加一行，直到整个list迭代完
导出的service方法如下，供大家参考！
public void exportExcel2(String payUsername) {
//得到要导出的数据
StringBuffer sb = new StringBuffer("from LogClaimRecord ");
if(StringUtils.isNotBlank(payUsername)){
sb=sb.append(" where payUserName='"+payUsername+"'");
}
sb.append(" order by createTime");
String sql = sb.toString();
List<LogClaimRecord> list = baseTransaction.find(sql);
//下载模板
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
String msg = "";
HttpServletResponse response = (HttpServletResponse)ActionContext.getContext().get("com.opensymphony.xwork2.dispatcher.HttpServletResponse");
response.reset();
try
{
response.setContentType("application/vnd.ms-excel;charset=UTF-8");
response.setHeader("Content-disposition", "attachment;filename=\"" + new String("Member Information.xls".getBytes("GBK"), "ISO-8859-1") + "\"");
//会员信息
} catch (UnsupportedEncodingException e1) {
msg = "不支持编码异常！";
}
String separator = java.io.File.separator; // 分隔符
String filePath = Platform.getInstance().getRealPath()+ separator+"templateFile"+separator;
Workbook rwb = null;
try {
InputStream is = new FileInputStream(filePath+"待认领记录.xls");
System.out.println("is==========="+is);
rwb = Workbook.getWorkbook(is);
System.out.println("rwb==========="+rwb);
WritableWorkbook wwb = Workbook.createWorkbook(response.getOutputStream(), rwb);
WritableSheet ws = wwb.getSheet(0);
int rowNum = 1;
int colNum = 0;
WritableFont wFont = new WritableFont(WritableFont.ARIAL, 10);
WritableCellFormat wcf = new WritableCellFormat(wFont);
wcf.setVerticalAlignment(VerticalAlignment.CENTRE);
wcf.setBorder(Border.ALL, BorderLineStyle.THIN);
wcf.setAlignment(Alignment.CENTRE);
wcf.setWrap(true);
for (int iRow = 0; iRow < list.size(); iRow++) {
colNum = 0;
//汇款金额
String payAmounts = list.get(iRow).getPayAmounts();
if(payAmounts == null){
ws.addCell(new Label(colNum, rowNum, "", wcf));
}else{
ws.addCell(new Label(colNum, rowNum, payAmounts+"元", wcf));
}
colNum++;
//汇款人
String payUserName = list.get(iRow).getPayUserName();
if(payAmounts == null){
ws.addCell(new Label(colNum, rowNum, "", wcf));
}else{
ws.addCell(new Label(colNum, rowNum, payUserName, wcf));
}
colNum++;
//汇款方式
String payWay = list.get(iRow).getPayWay();
if(payAmounts == null){
ws.addCell(new Label(colNum, rowNum, "", wcf));
}else if("1".equals(payWay.trim())){
ws.addCell(new Label(colNum, rowNum, "", wcf));
}else if("2".equals(payWay.trim())){
ws.addCell(new Label(colNum, rowNum, "现场转账", wcf));
}else if("3".equals(payWay.trim())){
ws.addCell(new Label(colNum, rowNum, "银行转账", wcf));
}else if("4".equals(payWay.trim())){
ws.addCell(new Label(colNum, rowNum, "邮局汇款", wcf));
}
colNum++;
//汇款时间
Timestamp payTime = list.get(iRow).getPayTime();
if(payTime == null){
ws.addCell(new Label(colNum, rowNum, "", wcf));
}else{
ws.addCell(new Label(colNum, rowNum, df.format(payTime), wcf));
}
colNum++;
//创建时间
Timestamp createTime = list.get(iRow).getCreateTime();
if(payTime == null){
ws.addCell(new Label(colNum, rowNum, "", wcf));
}else{
ws.addCell(new Label(colNum, rowNum, df.format(createTime), wcf));
}
colNum++;
//认领原因
String reason = list.get(iRow).getReason();
if(reason == null){
ws.addCell(new Label(colNum, rowNum, "", wcf));
}else{
ws.addCell(new Label(colNum, rowNum, reason, wcf));
}
colNum++;
rowNum++;
}
wwb.write();
wwb.close();
}
catch (Exception e)
{
msg = "数据没法写入excel中！！";
e.printStackTrace();
} finally {
System.out.println("finally.rwb==========="+rwb);
rwb.close();
}
}