poi完成excel文件上传和下载
一、 上传excel文件
1 spring-mvc.xml
2 jsp页面 - 导入excel代码块
//导入
$("#importBtn").click(function(){
importLists();
});
/*导入数据*/
function importLists(){
//var clientid = $("#clientid").val();
var FormDatas=new FormData($("#form-article-add")[0]);
var fileName=$("#file").val();
if(fileName == '') {
alert('请选择文件！');
return false;
}
//验证文件格式
var fileType = (fileName.substring(fileName.lastIndexOf(".") + 1, fileName.length)).toLowerCase();
if (fileType != 'xls' && fileType != 'xlsx') {
alert('文件格式不正确！');
return false;
}
$.ajax({
type:'post',
url:'${rootUrl}importList.dox',
async : false,
cache : false,
contentType : false,
processData : false,
data:FormDatas,
success: function(data){
data = JSON.parse(data);
if(data == "1"){
alert("名单上传成功！");
}
if(data == "0"){
alert("名单上传失败！");
}
else{}
},
error : function(data){
console.log(data.msg);
alert("系统异常！");
}
});
}3 主要Java代码体
/**
* 导入excel
* @return
*/
@RequestMapping("importList.dox")
@ResponseBody
public String importList(@RequestParam MultipartFile file, HttpServletRequest request) throws Exception {
boolean b = BlackWhiteListlUtil.checkExcelFile(file);
if(b == false){
return "0";
}
Workbook workbook = BlackWhiteListlUtil.getWorkBook(file);
if(workbook == null){
return "0";
}
//判断是否成功
Boolean success = true;
List> list = new ArrayList<>();
//获取第一个工作表
Sheet sheet = workbook.getSheet("Sheet1");
//获取sheet中第一行行号
int firstRowNum = sheet.getFirstRowNum();
//获取sheet中最后一行行号
int lastRowNum = sheet.getLastRowNum();
try {
//循环插入数据
for(int i=firstRowNum+1;i<=lastRowNum;i++){
Row row = sheet.getRow(i);
Cell optionClass = row.getCell(0);//名单种类
Cell optionType = row.getCell(1);//名单类型
Cell textimport = row.getCell(2);//名单内容
Cell invalidtime = row.getCell(3);//失效时间
if(optionClass!=null && optionType!=null && textimport!=null){
Map map = new HashMap<>();
optionClass.setCellType(Cell.CELL_TYPE_STRING);
String optionsKey = BlackWhiteListlUtil.getOptionClassKey(optionClass.getStringCellValue());
map.put("optionClass", optionsKey);
optionType.setCellType(Cell.CELL_TYPE_STRING);
String optionTypeKey = BlackWhiteListlUtil.getOptionTypeKey(optionType.getStringCellValue());
map.put("optionType", optionTypeKey);
textimport.setCellType(Cell.CELL_TYPE_STRING);
map.put("textimport", textimport.getStringCellValue());
invalidtime.setCellType(Cell.CELL_TYPE_STRING);
map.put("invalidtime", invalidtime.getStringCellValue());
list.add(map);
}
}
//usersMapper.insert(list);//往数据库插入数据
} catch (Exception e) {
success = false;
e.printStackTrace();
} finally {
workbook.close();
}
if(success == true){
//将list存入redis
JedisCluster jedis = RedisClusterClientUtils.getJedis();
for (Map map : list) {
String redisKey = BlackWhiteListlUtil.getRedisKey(map.get("optionClass"), map.get("optionType"));
jedis.hset(redisKey + map.get("textimport"), "time", map.get("invalidtime")==null?"":map.get("invalidtime"));
}
return "1";
}
else{
return "0";
}
}
4 工具类
/**
* 检查 excel文件格式是否正确
*/
public static boolean checkExcelFile(MultipartFile file) throws Exception{
//判断文件是否存在
if(null == file){
return false;
}
//获得文件名
String fileName = file.getOriginalFilename();
//判断文件是否是excel文件
if(!fileName.endsWith("xls") && !fileName.endsWith("xlsx")){
return false;
}
return true;
}
/**
* excel 生成通用的Workbook
*/
public static Workbook getWorkBook(MultipartFile file) {
//获得文件名
String fileName = file.getOriginalFilename();
//创建Workbook工作薄对象，表示整个excel
Workbook workbook = null;
try {
//获取excel文件的io流
InputStream is = file.getInputStream();
//根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象
if(fileName.endsWith("xls")){
//2003
workbook = new HSSFWorkbook(is);
}else if(fileName.endsWith("xlsx")){
//2007
workbook = new XSSFWorkbook(is);
}
} catch (IOException e) {
e.printStackTrace();
}
return workbook;
}
/**
* excel 判断cell数据类型
*/
public static String getCellValue(Cell cell){
String cellValue = "";
if(cell == null){
return cellValue;
}
//把数字当成String来读，避免出现1读成1.0的情况
if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
cell.setCellType(Cell.CELL_TYPE_STRING);
}
//判断数据的类型
switch (cell.getCellType()){
case Cell.CELL_TYPE_NUMERIC: //数字
cellValue = String.valueOf(cell.getNumericCellValue());
break;
case Cell.CELL_TYPE_STRING: //字符串
cellValue = String.valueOf(cell.getStringCellValue());
break;
case Cell.CELL_TYPE_BOOLEAN: //Boolean
cellValue = String.valueOf(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_FORMULA: //公式
cellValue = String.valueOf(cell.getCellFormula());
break;
case Cell.CELL_TYPE_BLANK: //空值
cellValue = "";
break;
case Cell.CELL_TYPE_ERROR: //故障
cellValue = "非法字符";
break;
default:
cellValue = "未知类型";
break;
}
return cellValue;
}
需要导入的excel如图：
二 、导出excel
1 主要js代码块
//导出
$("#exportBtn").click(function(){
var optionsClass = $("#selectClass").val();
var optionsType = $("#selectType").val();
if(optionsClass == ""){
alert("请选择名单种类！");
}
if(optionsType == ""){
alert("请选择名单类型！");
}
window.location.href = "${rootUrl}exportList.dox?optionsClass="+optionsClass+"&optionsType="+optionsType;
});
2 主要Java代码块
/**
* 导出excel
* @return
*/
@RequestMapping("exportList.dox")
public void exportLisr(String optionsClass, String optionsType, HttpServletResponse response, Integer eid){
// 第一步，创建一个webbook，对应一个Excel文件
HSSFWorkbook wb = new HSSFWorkbook();
// 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet
HSSFSheet sheet = wb.createSheet("sheet1");
// 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short
HSSFRow row = sheet.createRow((int) 0);
//查找数据
String redisKey = BlackWhiteListlUtil.getRedisKey(optionsClass, optionsType);
Set set= RedisClusterClientUtils.redisKeys(redisKey + "*");
Iterator it = set.iterator();
JedisCluster jedis = RedisClusterClientUtils.getJedis();
//获得名单种类和名单类型的中文名
String optionClassName = BlackWhiteListlUtil.getOptionClassName(optionsClass);
String optionTypeName = BlackWhiteListlUtil.getOptionTypeName(optionsType);
int i = 0;
while (it.hasNext()) {
row = sheet.createRow(i);
if( i == 0){
//设置标头
row.createCell(0).setCellValue("名单种类");
row.createCell(1).setCellValue("名单类型");
row.createCell(2).setCellValue("名单内容");
row.createCell(3).setCellValue("失效时间");
}else{
String keyStr = it.next();
// 名单值
String key = StringUtils.substringAfterLast(keyStr,"_");
// 在redis获取其他属性
String time = jedis.hget(keyStr, "time");
row.createCell(0).setCellValue(optionClassName);
row.createCell(1).setCellValue(optionTypeName);
row.createCell(2).setCellValue(key);
if (key.length() > 8){
}
if (StringUtils.isNotEmpty(time)){
row.createCell(3).setCellValue(time);
}
sheet.autoSizeColumn(0);
sheet.autoSizeColumn(1);
sheet.autoSizeColumn(2);
sheet.autoSizeColumn(3);
}
i ++;
}
//下载
ServletOutputStream out;
try {
out = response.getOutputStream();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd-HH:mm:ss");
Date date = new Date();
String fileName = sdf.format(date)+".xls";
response.reset();
response.setContentType("application/msexcel");
response.setHeader("Content-disposition", "attachment; filename="+fileName);
wb.write(out);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
三、模板下载
/**
* 模板下载
* @param response
* @throws Exception
*/
@RequestMapping("downListModel.dox")
public void downListModel(HttpServletResponse response, HttpServletRequest request) throws Exception {
InputStream inStream = BlackWhiteListController.class.getClassLoader().getResourceAsStream("/model.xls");
// 下载本地文件
String fileName = "model.xls"; // 文件的默认保存名
// 读到流中
// 设置输出的格式
response.reset();
response.setContentType("bin");
response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
// 循环取出流中的数据
byte[] b = new byte[100];
int len;
try {
while ((len = inStream.read(b)) > 0)
response.getOutputStream().write(b, 0, len);
inStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
完成！