最近需要读取从客户端发送过来的excel文件内容，excel文件的格式是事先规定好的不变的。所以就研究了一下，因为是自己写的需要测试所以先写了个简单的网页上传文件，看客户端上传文件代码：
<html>
<body>
<div class="offset1 span10 container-fluid">
<form id="firmForm" class="form-horizontal"
action="/front/cashFlow/payForAnotherInformationList.htm"
method="post" enctype="multipart/form-data" accept-charset="utf-8">
<div class="control-group">
<div class="control-group">
<label class="control-label" for="input01">上传文件:</label>
<div class="controls" style="padding-top: 5px">
<input id="entrustFile" name="entrustFile" type="file" value="文件">
</div>
</div>
<input name="btnSubmit" type="button" class="tjBtn" id="btnSubmit"
value="提交" onclick="javascript:submit();"/>
</form>
</div>
</body>
</html>
<script type="text/javascript">
function submit() {
document.getElementById("firmForm").submit();
}
</script>
客户端的工作完成了可以上传文件测试了，现在主要介绍服务端的工作，首先我为了解析excel文件的内容导入一个框架：poi-3.9-20121203.jar
然后我们第一步要做的是从request中获取到这个文件，将HttpServletRequest类型的请求强转成MultipartHttpServletRequest类型的请求，然后MultipartHttpServletRequest有个方法，可以通过文件名获取文件，获取到文件后通过getInputStream()函数获取文件内容：
/**
* Return the contents plus description of an uploaded file in this request,
* or {@code null} if it does not exist.
* @param name a String specifying the parameter name of the multipart file
* @return the uploaded content in the form of a {@link MultipartFile} object
*/
MultipartFile getFile(String name);
接下来直接看源码：
/**
* 读取excel文件
*/
public List<CashOutRecord> haveFileFromClient(HttpServletRequest request) throws IOException {
// 转型为MultipartHttpRequest：
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
// 获得文件：
MultipartFile contactFile = multiRequest.getFile("entrustFile");
// 获取的代付信息列表
List<CashOutRecord> resultList = new ArrayList<CashOutRecord>();
if (null != contactFile && !contactFile.isEmpty()) {
//解析文档
POIFSFileSystem fs;
//获取整个文档
HSSFWorkbook wb;
// 页
HSSFSheet sheet;
// 行
HSSFRow row;
// 打开文件
try {
fs = new POIFSFileSystem(contactFile.getInputStream());
wb = new HSSFWorkbook(fs);
} catch (IOException e) {
e.printStackTrace();
wb = new HSSFWorkbook();
}
String entrustNo = RandomStringUtils.randomNumeric(9);
//获取第一页
sheet = wb.getSheetAt(0);
// 得到总行数
int rowNum = sheet.getLastRowNum();
// 正文内容应该从第二行开始,第一行为表头的标题
for (int i = 1; i <= rowNum; i++) {
String outNo = entrustNo + "_" + RandomStringUtils.randomNumeric(6);
row = sheet.getRow(i);
String accountType = "";
String accountName = "";
String accountNum = "";
String bankName = "";
String bankProv = "";
String bankCity = "";
BigDecimal amount = null;
String bankBranch = "";
String reason = "";
try {
int idx = 0;
idx++;
accountType = getCellFormatValue(row.getCell(idx));
idx++;
accountName = getCellFormatValue(row.getCell(idx));
idx++;
accountNum = getCellFormatValue(row.getCell(idx));
idx++;
bankName = getCellFormatValue(row.getCell(idx));
idx++;
bankProv = getCellFormatValue(row.getCell(idx));
idx++;
bankCity = getCellFormatValue(row.getCell(idx));
idx++;
amount = new BigDecimal(getCellFormatValue(row.getCell(idx)));
idx++;
bankBranch = getCellFormatValue(row.getCell(idx));
idx++;
reason = getCellFormatValue(row.getCell(idx));
CashOutRecord cashEntrustRecord = new CashOutRecord();
cashEntrustRecord.setOutNo(outNo);
cashEntrustRecord.setAccountname(accountName);
cashEntrustRecord.setAccountnum(accountNum);
cashEntrustRecord.setBankname(bankName);
cashEntrustRecord.setBankbranch(bankBranch);
cashEntrustRecord.setBankprov(bankProv);
cashEntrustRecord.setBankcity(bankCity);
cashEntrustRecord.setAmount(amount);
if (accountType.equals("个人账户")) {
cashEntrustRecord.setAccounttype(11);
} else if (accountType.equals("企业账户")) {
cashEntrustRecord.setAccounttype(12);
}
cashEntrustRecord.setRemark(reason);
resultList.add(cashEntrustRecord);
} catch (Exception ex) {
System.out.print(ex);
}
}
return resultList;
}
return null;
}
----------
对于每个excel文件的表格中内容的格式我们也要做处理
----------
/**
* 匹配excel表格cell的类型
*/
private String getCellFormatValue(HSSFCell cell) {
String cellvalue = "";
if (cell != null) {
// 判断当前Cell的Type
switch (cell.getCellType()) {
// 如果当前Cell的Type为NUMERIC
case HSSFCell.CELL_TYPE_NUMERIC:
case HSSFCell.CELL_TYPE_FORMULA: {
// 判断当前的cell是否为Date
if (HSSFDateUtil.isCellDateFormatted(cell)) {
Date date = cell.getDateCellValue();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
cellvalue = sdf.format(date);
}
// 如果是纯数字
else {
// 取得当前Cell的数值
cellvalue = String.valueOf(cell.getNumericCellValue());
}
break;
}
// 如果当前Cell的Type为STRIN
case HSSFCell.CELL_TYPE_STRING:
// 取得当前的Cell字符串
cellvalue = cell.getRichStringCellValue().getString();
break;
// 默认的Cell值
default:
cellvalue = " ";
}
} else {
cellvalue = "";
}
return cellvalue;
}