导入excel文件将数据插入到数据库并且以列表形式展示

1、前端页面(只展示核心代码片段，即文件导入按钮)
<form class="form-inline" id="productSearchForm">
  <div class="form-group">
     <label for="productName">产品名称:</label>
                 <input type="text" class="form-control input-sm" name="productName" />
  </div>
  <button type="button" class="b-redBtn btn-i" id="searchBtn">
     <i class="iconfont">&#xe67a;</i>查询
  </button>
  <button type="button" class="b-redBtn  btn-i" id="resetBtn">
     <i class="iconfont">&#xe647;</i>重置查询
  </button>
  <button type="button" class="b-redBtn  btn-i" id="addProductBtn">
     <i class="iconfont">&#xe635;</i>新增产品
  </button>
  <a id="downloadFile" href="<%=webpath%>/resources/js/orderCenter/productTabTemplet.xlsx">
    <button type="button" class="b-redBtn  btn-i" id="downloadTempletBtn">
      <i class="iconfont">&#xe724;</i>模板下载
    </button>
  </a>
  <input type="file" name="files" id="files" style="display:none;" />
   <button type="button" class="b-redBtn  btn-i" id="excelImportBtn" onclick="scan()">
      <i class="iconfont">&#xe680;</i>excel导入
   </button>
   <span id="fileInput"></span>
</form>
2、核心js代码片段展示
function scan() {
   var files = document.getElementById("files");
   files.setAttribute("onchange", "fileCheck(this)");
   layer.confirm('导入excel前,请先下载左侧模板、按照模板指定格式,完成填写并导入,否则会导入失败！', {
   icon: 3,
   btn: ['是','否'] //按钮
   },function(index, layero){
layer.close(index);
files.click();
    });
}

function fileCheck(obj){
   for (var i = 0; i < obj.files.length; i++) {
var fileName = obj.files[i].name;
var postfix = obj.files[i].name.match(/^(.*)(\.)(.{1,8})$/)[3].toLowerCase(); //获得上传文件的后缀名的正则表达式;
var fileMaxSize=(obj.files[i].size/1024/1024).toFixed(2);                     //前端获取待上传的文件大小
if (!(postfix == "xlsx" || postfix == "xls")) {
layer.confirm('文件类型不正确,请重新上传excel文件！', {
        icon: 3,
        btn: ['是','否'] //按钮
},function(index, layero){
      layer.close(index);
   //window.location.href=webpath+"/orderCenter/productManage";
  });
$('#files').val('');
return false;
};

if(fileMaxSize > 1){
     layer.confirm('excel文件文件大小不得超过1M，请重新上传 ！', {
     icon: 3,
     btn: ['是','否'] //按钮
   },function(index, layero){
layer.close(index);
  });
  $('#files').val('');
return false;
}
   var fileNameInput=document.getElementById("fileInput");
   fileNameInput.innerText=fileName;
   //layer.msg(content, options, end)开始导入数据

   layer.msg('开始导入excel数据，请稍等...', {
     icon: 6,
     time: 3000 //3秒关闭（如果不配置，默认是3秒）
    }, function(){
//layer.alert('测试');
$.ajaxFileUpload({
url :webpath+"/orderCenter/importExcel",
fileElementId : "files",
type : "post",
dataType : "text",
data : {"flag":"开始导入"},
success : function(data){ 
        var result = data.replace("<pre>", "").replace("</pre>", "").replace("<PRE>", "").replace("</PRE>", "").replace(/<[^>]+>/g, "");
var resultFlag=$.parseJSON(result);    
receiveData(resultFlag);
   }
});
console.log("已经导入excel中的数据");
});

function receiveData(resultFlag){
    if(resultFlag.idIsNull=="true"){       
alert('导入失败,导入的产品ID存在空值,位于表格第'+resultFlag.errorLine+'行');
}
    if(resultFlag.idIsRepeat=="true"){
    alert('导入失败,导入的产品ID存在重复,请仔细检查！');
    }
    if(resultFlag.idCodeIsNotSame=="true"){
    alert('导入失败,导入的产品ID和产品编码不一致,位于表格第'+resultFlag.errorLine+'行');
    }
    if(resultFlag.excelAndTabRepeat=="true"){
    alert('导入失败,导入的产品编码在数据库码表中早已存在,重复的产品编码为'+resultFlag.repeatCode);
    }
window.location.href=webpath+"/orderCenter/productManage";
console.log("导入完成");
}
    }
}
java核心代码展示
// 导入产品的表格数据
@ResponseBody
@RequestMapping(value = "/importExcel", method = RequestMethod.POST)
public Map<String,Object> importExcel(String flag, HttpServletRequest request, HttpServletResponse response) throws Exception {
response.setContentType("text/html;charset=UTF-8");
String fileName = null;
if (request instanceof MultipartHttpServletRequest) {
MultipartHttpServletRequest mr = (MultipartHttpServletRequest) request;
Iterator<?> iter = mr.getFileMap().values().iterator();
// 支持多文件上传，暂时是单文件的上传
if (iter.hasNext()) {
MultipartFile file = (MultipartFile) iter.next();
try {
Workbook book = null;
try {
book = new XSSFWorkbook(file.getInputStream());
} catch (Exception ex) {
book = new HSSFWorkbook(file.getInputStream());
}
// 获得第一个工作薄
Sheet sheet = book.getSheetAt(0);
Row row = null;
Row row2 = null;
Row row3=null;
boolean idIsNull=false;
int errorLine=0;
//判断product_id是否有重复
boolean isRepeat = false;
//id和code是否相同idCodeIsSame
boolean idCodeIsNotSame=false;
// 获得总行数
int totalRows = sheet.getLastRowNum();
// 获得总列数
int coloumNum = sheet.getRow(1).getPhysicalNumberOfCells();
System.out.println("总行数totalRows==>" + totalRows);
System.out.println("总列数coloumNum==>" + coloumNum);
System.out.println("开始获取表格中的数据");
// 表格数据的行数为
int verifyNum = totalRows - 2;
String[] procIdArr = new String[verifyNum];
String[] procCodeArr = new String[verifyNum];

for (int i = 3; i <= totalRows; i++) {
row2 = sheet.getRow(i);
if(null !=row2.getCell(0)){
System.out.println("row2.getCell(0)===>"+row2.getCell(0));
String tem = row2.getCell(0).toString();
System.out.println("第一列procId：从第三行开始--》" + tem);
procIdArr[i - 3] = tem;
}
if(null==row2.getCell(0)){
idIsNull=true;
errorLine=i+1;
String errorLineStr=String.valueOf(errorLine);
params.put("idIsNull", "true");
params.put("errorLine", errorLineStr);
System.out.println("--idIsNull---"+idIsNull+"---errorLine-->"+errorLine);
return params;
}
}

Set<String> set = new HashSet<String>();
for (String str : procIdArr) {
set.add(str);
}
if (set.size() != procIdArr.length) {
isRepeat = true;// 重复
params.put("idIsRepeat", "true");
return params;
} else {
isRepeat = false;// 不重复
}
System.out.println("判断productId是否存在重复的判断结果为==>"+isRepeat);

for (int i = 3; i <= totalRows; i++) {
row3 = sheet.getRow(i);
String tem3 = row3.getCell(1).toString();
System.out.println("第二列：从第三行开始--》" + tem3);
procCodeArr[i - 3] = tem3;
}
for (int k = 0; k < procIdArr.length; k++) {
if(!procCodeArr[k].equals(procIdArr[k])){
idCodeIsNotSame=true;
errorLine=k+4;
String errorLineStr=String.valueOf(errorLine);
params.put("idCodeIsNotSame", "true");
params.put("errorLine", errorLineStr);
return params;
}
}
System.out.println("id和code是否相同"+idCodeIsNotSame+"是在第几行==>"+errorLine);

//校验表格id和数据库码表中的id是否有相同，有相同，则不让其导入;
for(int i=0;i<procCodeArr.length;i++){
String excelAndTabRepeat=orderCenterService.validateProCodeIsExist(procCodeArr[i]);
if(null!=excelAndTabRepeat){
params.put("excelAndTabRepeat", "true");
params.put("repeatCode", excelAndTabRepeat);
return params;
}
}

for (int i = 3; i <= totalRows; i++) {
row = sheet.getRow(i);
if (row == null) {
continue;
}
for (int k = 0; k < coloumNum; k++) {
String productField = sheet.getRow(2).getCell(k).toString().trim();
if (!"ORD".equalsIgnoreCase(productField) && !"RST6".equalsIgnoreCase(productField) && !"RST7".equalsIgnoreCase(productField)) {
if (row.getCell(k) == null) {
params.put(productField, "");
continue;
}
String productFieldValue = row.getCell(k).toString().trim();
params.put(productField, productFieldValue);
}
if ("ORD".equalsIgnoreCase(productField)) {
if (row.getCell(k) == null) {
params.put(productField, "");
continue;
}
String productFieldValue = row.getCell(k).toString().trim();
// 数据库码表中,字段类型为mediumint
params.put(productField, Integer.parseInt(productFieldValue));
}
if ("RST6".equalsIgnoreCase(productField) || "RST7".equalsIgnoreCase(productField)) {
if (row.getCell(k) == null) {
params.put(productField, "");
continue;
}
String productFieldValue = row.getCell(k).toString().trim();
// 数据库码表中,字段类型为decimal
BigDecimal bd = new BigDecimal(productFieldValue);
params.put(productField, bd);
}
}
// 开始执行测试代码
System.out.println("=======" + i);
System.out.println(params);
// 开始将表格数据导入到数据库
orderCenterService.importExcelDatas(params);
}
fileName = file.getOriginalFilename();
System.out.println("文件名为：" + fileName);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
params.put("processNormal", "true");
return params;
}