java excel上传
对于上传和下载excel文件，程序开发里经常用到，这里只做简要总结：
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if(isMultipart == false) {
throw new IOException("HTTP request does not contains multipart content!");
}
DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setSizeThreshold(10240);
ServletFileUpload upload = new ServletFileUpload(factory);
try {
List<FileItem> items = upload.parseRequest(request);
Iterator<FileItem> iter = items.iterator();
while (iter.hasNext()) {
FileItem item = iter.next();
if (item.isFormField() == false) {
//String fieldName = item.getFieldName();
//boolean isInMemory = item.isInMemory();
//item may return the absolute full path name. we only need the last name
String fileName = item.getName();
InputStream uploadedStream = item.getInputStream();
request.setAttribute("fileName", fileName);
request.setAttribute("inputStream", uploadedStream);
}
}
} catch (FileUploadException e) {
throw new IOException(e);
}
注意：这里的文件名是包含路径的，需要进行解析
int flag = fileName.lastIndexOf('/');
if(flag<0)flag = fileName.lastIndexOf('\\');
if(flag>=0)
return fileName.substring(flag+1)
else
return fileName;
有了文件名后，可以区分2003和2007及以后的版本了。
对于jxl，只能解析2003的版本。对于poi，两个版本都支持。但是对于非官方的excel文档，解析是有问题的
需要重新下载 poi-bin-3.8-20120326.zip文件，下载之后解压，拷贝相关的jar到lib目录即可。
public String upload() throws Exception{
XSSFWorkbook rwb = null;
HSSFWorkbook hwb = null;
InputStream io = (InputStream)request.getAttribute("inputStream");
String fileName = (String)request.getAttribute("fileName");
String fileExpName = fileName.substring(fileName.indexOf(".")+1);
if(Constant.EXCEL2003_EXTENSION.equals(fileExpName)){
versionFlag = Constant.EXCEL_VERSION_2003;
}else if(Constant.EXCEL2007_EXTENSION.equals(fileExpName)){
versionFlag=Constant.EXCEL_VERSION_2007;
}else{
request.setAttribute("resMsg","上传的文件格式应该是excel文件，请重新选择！");
return "success";
//throw new Exception("上传的文件格式不正确，请重新选择！");
}
List<PotentialCustomerInfoVO> potentialCustomerInfoList = new ArrayList<PotentialCustomerInfoVO>();
try{
if(Constant.EXCEL_VERSION_2007.equals(versionFlag)){
rwb = new XSSFWorkbook(io);
XSSFSheet sheet = rwb.getSheetAt(0);
//得到所有的行
int rows = sheet.getLastRowNum();
if(rows>10000){
request.setAttribute("resMsg","导入的数据不能超过一万条！！！");
return "success";
}
//得到excel数据
for(int i=2;i<=rows;i++){
XSSFRow row = sheet.getRow(i);
if(row !=null){
PotentialCustomerInfoVO pcv = new PotentialCustomerInfoVO();
int cols = row.getLastCellNum();
if(cols!=8){
request.setAttribute("resMsg","上传的excel文件第"+(i+1)+"行不能有空字段！");
return "success";
}
//读取列数
for (int k = 0; k < cols; k++) {
XSSFCell cell = row.getCell((short)k);
if (null != cell) {
String ret = changeToString(cell.getCellType(), cell);
switch(k){
case 0:
//车主姓名
pcv.setCustomerName(ret);
break;
case 1:
//证件类型
String tempValue = "";
if(Constant.CERTITYPE_TEXT_SFZ.equals(ret)){
tempValue = Constant.CERTITYPE_VALUE_SFZ;
}else if(Constant.CERTITYPE_TEXT_JGZ.equals(ret)){
tempValue = Constant.CERTITYPE_VALUE_JGZ;
}else if(Constant.CERTITYPE_TEXT_HZ.equals(ret)){
tempValue = Constant.CERTITYPE_VALUE_HZ;
}else if(Constant.CERTITYPE_TEXT_QT.equals(ret)){
tempValue = Constant.CERTITYPE_VALUE_QT;
}
pcv.setCertiType(tempValue);
break;
case 2:
pcv.setCertiCode(ret);
break;
case 3:
pcv.setLicenceNumber(ret);
break;
case 4:
pcv.setVin(ret);
break;
case 5:
pcv.setEngineNumber(ret);
break;
case 6:
pcv.setDriverNumber(ret);
break;
case 7:
pcv.setF_1(ret);
break;
default:
break;
}
}else{
//行内有空字段
request.setAttribute("resMsg","上传的excel文件第"+(i+1)+"行不能有空字段！");
return "success";
}
}
potentialCustomerInfoList.add(pcv);
}
}// for rows
}else if(Constant.EXCEL_VERSION_2003.equals(versionFlag)){
hwb = new HSSFWorkbook(io);
HSSFSheet sheet = hwb.getSheetAt(0);
//得到所有的行
int rows = sheet.getLastRowNum();
if(rows>10000){
request.setAttribute("resMsg","导入的数据不能超过一万条！！！");
return "success";
}
//得到excel数据
for(int i=2;i<=rows;i++){
HSSFRow row = sheet.getRow(i);
if(row !=null){
int cols = row.getLastCellNum();
if(cols!=8){
request.setAttribute("resMsg","上传的excel文件第"+(i+1)+"行不能有空字段！");
return "success";
}
PotentialCustomerInfoVO pcv = new PotentialCustomerInfoVO();
//读取列数
for (int k = 0; k < cols; k++) {
HSSFCell cell = row.getCell((short)k);
if (null != cell) {
String ret = changeToString(cell.getCellType(), cell);
switch(k){
case 0:
//车主姓名
pcv.setCustomerName(ret);
break;
case 1:
//证件类型
String tempValue = "";
if(Constant.CERTITYPE_TEXT_SFZ.equals(ret)){
tempValue = Constant.CERTITYPE_VALUE_SFZ;
}else if(Constant.CERTITYPE_TEXT_JGZ.equals(ret)){
tempValue = Constant.CERTITYPE_VALUE_JGZ;
}else if(Constant.CERTITYPE_TEXT_HZ.equals(ret)){
tempValue = Constant.CERTITYPE_VALUE_HZ;
}else if(Constant.CERTITYPE_TEXT_QT.equals(ret)){
tempValue = Constant.CERTITYPE_VALUE_QT;
}
pcv.setCertiType(tempValue);
break;
case 2:
pcv.setCertiCode(ret);
break;
case 3:
pcv.setLicenceNumber(ret);
break;
case 4:
pcv.setVin(ret);
break;
case 5:
pcv.setEngineNumber(ret);
break;
case 6:
pcv.setDriverNumber(ret);
break;
case 7:
pcv.setF_1(ret);
default:
break;
}
}else{
request.setAttribute("resMsg","上传的excel文件第"+(i+1)+"行不能有空字段！");
return "success";
}
}
potentialCustomerInfoList.add(pcv);
}
}
}
//对组装的list数据进行导入，也就是保存
}catch(Exception e){
e.printStackTrace();
request.setAttribute("resMsg","上传出错，请联系系统管理员！");
throw new Exception(e.getMessage());
}
return "success";
}