Upload excel from JSP and Insert excel into Database
- 2021-07-18 08:44:14
- OfStack
This article illustrates how JSP uploads excel and excel inserts into the database. Share it for your reference. The details are as follows:
This import excel is bound to pojo, (disadvantage) excle header must be the field value of pojo
1. html page:
<form id="myform" method="post" enctype="multipart/form-data">
<table>
<tr>
<td></td>
<td>
<input type="file" name="filepath" id="filepath"
class="easyui-validatebox" required=true
validType="equalLength[4]" missingMessage=" Documents !" value="" />
</td>
</tr>
<tr align="center">
<td colspan="2">
<a id="btn1" class="easyui-linkbutton"
data-options="iconCls:'icon-ok'" style="width: 60px"
onclick="subForm();">OK</a>
<a id="btn2" class="easyui-linkbutton"
data-options="iconCls:'icon-cancel'" style="width: 60px"
onclick="closeDig();">Cancel</a>
</td>
</tr>
</table>
</form>
<script type="text/javascript">
function subForm(){
if($('#myform').form('validate')){
/**
var filepath = $("#filepath").val();
alert(filepath);
$.ajax({
url: 'excleImport',
typs: "post",
data: {"filepath":filepath},
async: false,
error: function(request) {
$('#dg').datagrid('reload');
closeDig();
$.messager.alert(" Operation tips ", " Operation successful! ","info");
},
success: function(data) {
alert("success");
}
});
**/
var filepath = $("#filepath").val();
var re = /(\\+)/g;
var filename = filepath.replace(re,"#");
// Cut and intercept the path string
var one = filename.split("#");
// Gets the last in the array 1 A, that is, the file name
var two = one[one.length-1];
// Then intercept the file name to get the suffix name
var three = two.split(".");
// Gets the last of the intercepted 1 String, which is the suffix name
var last = three[three.length-1];
// Add the suffix name type to be judged
var tp = "xls,xlsx";
// Returns the position of the qualified suffix name in the string
var rs = tp.indexOf(last);
if(rs != -1){
$("#myform").attr("action","excleImport");
$("#myform").submit();
}else{
$.messager.alert(" Operation tips ", " The upload file you selected is not valid xls Or xlsx Files! ","error");
return false;
}
} else {
$.messager.alert(" Operation tips ", " Please select Upload File! ","error");
}
}
</script>
2. java code:
@RequestMapping("/excleImport")
public void excleImport(HttpServletRequest request) throws IOException, Exception {
request.setCharacterEncoding("utf-8"); // Set code
// Get Disk File Entry Factory
DiskFileItemFactory factory = new DiskFileItemFactory();
// Get the path to which the file needs to be uploaded
String path = request.getRealPath("/upload/kaku");
File uploadDir = new File(path);
if (!uploadDir.exists()) {
uploadDir.mkdirs();
}
factory.setRepository(uploadDir);
// Settings The size of the cache. When the capacity of the uploaded file exceeds the cache, it is directly put into the Temporary storage room
factory.setSizeThreshold(1024*1024) ;
// High level API File upload processing
ServletFileUpload upload = new ServletFileUpload(factory);
// You can upload multiple files
List<FileItem> list = (List<FileItem>)upload.parseRequest(request);
for(FileItem item : list)
{
// Gets the property name of the form
String name = item.getFieldName();
// If the retrieved Form information is generic Text Information
if(item.isFormField())
{
// Gets the string entered by the user The name is very good, because the form submitted is String type
String value = item.getString() ;
request.setAttribute(name, value);
}
// For incoming non- Simple string processing For example 2 Binary Pictures, movies, these
else
{
/**
* The following 3 Step, which mainly obtains The name of the uploaded file
*/
// Get the pathname
String value = item.getName() ;
// Index to last 1 Backslash
int start = value.lastIndexOf("\\");
// Interception Upload the file String name, plus 1 Yes Remove the backslash,
String filename = value.substring(start+1);
// File suffix name
String prefix = filename.substring(filename.lastIndexOf(".") + 1);
CardCenter cardCenter = new CardCenter();
request.setAttribute(name, filename);
// Really write to disk
// The exception it throws Use exception Capture
//item.write( new File(path,filename) );// No. 1 3 Provided by the party
// Written manually
//OutputStream out = new FileOutputStream(new File(path,filename));
InputStream in = item.getInputStream() ;
List<CardCenter> listFromExcel = (List<CardCenter>)ExelUtil.exportListFromExcel(in, prefix, cardCenter);
this.cardCenterService.excleImport(listFromExcel);
/*int length = 0 ;
byte [] buf = new byte[1024] ;
System.out.println(" Gets the total capacity of the uploaded file: "+item.getSize());
// in.read(buf) The data read each time is stored in buf Array
while( (length = in.read(buf) ) != -1)
{
// In buf Array Fetch data Write to (Output stream) on disk
out.write(buf, 0, length);
} */
in.close();
//out.close();
}
}
}
3. java code:
public class ExelUtil {
// No. 1 1 Column start
private static int start = 0;
// Finally 1 Column serial number
private static int end =0;
public static String getSubString(String str){
return str.substring(0,str.lastIndexOf("."));
}
/**
* Method description: By Excel Documentary Sheet Export to List
* @param file
* @param sheetNum
* @return
* @throws IOException
* @author
* @date 2013-3-25 Afternoon 10:44:26
* @comment
*/
public static List<?> exportListFromExcel(File file, String fileFormat,Object dtoobj)
throws IOException {
return exportListFromExcel(new FileInputStream(file), fileFormat,dtoobj);
}
/**
* Method description: By Excel Streamy Sheet Export to List
* @param is
* @param extensionName
* @param sheetNum
* @return
* @throws IOException
* @author
* @date 2013-3-25 Afternoon 10:44:03
* @comment
*/
public static List<?> exportListFromExcel(InputStream is,String fileFormat,Object dtoobj) throws IOException {
Workbook workbook = null;
if (fileFormat.equals(BizConstant.XLS)) {
workbook = new HSSFWorkbook(is);
} else if (fileFormat.equals(BizConstant.XLSX)) {
workbook = new XSSFWorkbook(is);
}
return exportListFromExcel(workbook,dtoobj);
}
/**
* Method description: By the specified Sheet Export to List
* @param workbook
* @param sheetNum
* @return
* @author
* @date 2013-3-25 Afternoon 10:43:46
* @comment
*/
private static List<Object> exportListFromExcel(Workbook workbook ,Object dtoobj) {
List<Object> list = new ArrayList<Object>();
String[] model = null;
Sheet sheet = workbook.getSheetAt(0);
// Analytic formula result
FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();
int minRowIx = sheet.getFirstRowNum();
int maxRowIx = sheet.getLastRowNum();
for (int rowIx = minRowIx; rowIx <= maxRowIx; rowIx++) {
Object obj = null;
if(rowIx==minRowIx){
start = sheet.getRow(rowIx).getFirstCellNum();
end = sheet.getRow(rowIx).getLastCellNum();
}
Row row = sheet.getRow(rowIx);
StringBuilder sb = new StringBuilder();
for (int i = start; i < end; i++) {
Cell cell = row.getCell(new Integer(i));
CellValue cellValue = evaluator.evaluate(cell);
if (cellValue == null) {
sb.append(BizConstant.SEPARATOR+null);
continue;
}
// After formula analysis, it only exists in the end Boolean , Numeric And String3 Data types, in addition to the Error It's over
// The remaining data types, according to official documents, can be completely ignored
switch (cellValue.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
sb.append(BizConstant.SEPARATOR + cellValue.getBooleanValue());
break;
case Cell.CELL_TYPE_NUMERIC:
// The date type here will be converted into a number type, which needs to be distinguished after discrimination
if (DateUtil.isCellDateFormatted(cell)) {
sb.append(BizConstant.SEPARATOR + cell.getDateCellValue());
} else {
sb.append(BizConstant.SEPARATOR + cellValue.getNumberValue());
}
break;
case Cell.CELL_TYPE_STRING:
sb.append(BizConstant.SEPARATOR + cellValue.getStringValue());
break;
case Cell.CELL_TYPE_FORMULA:
break;
case Cell.CELL_TYPE_BLANK:
break;
case Cell.CELL_TYPE_ERROR:
break;
default:
break;
}
}
if(rowIx==minRowIx){
String index = String.valueOf(sb);
String realmodel =index.substring(1, index.length());
model =realmodel.split(",");
}else{
String index = String.valueOf(sb);
String realvalue =index.substring(1, index.length());
String[] value =realvalue.split(",");
// Field mapping
try {
dtoobj =dtoobj.getClass().newInstance();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
obj = reflectUtil(dtoobj,model,value);
list.add(obj);
}
}
return list;
}
/**
* Method description: Field mapping assignment
* @param objOne
* @param listName
* @param listVales
* @return
* @author
* @date 2013-3-25 Afternoon 10:53:43
* @comment
*/
@SuppressWarnings("deprecation")
private static Object reflectUtil(Object objOne, String[] listName,
String[] listVales) {
Field[] fields = objOne.getClass().getDeclaredFields();
for (int i = 0; i < fields.length; i++) {
fields[i].setAccessible(true);
for (int j = 0; j < listName.length; j++) {
if (listName[j].equals(fields[i].getName())) {
try {
if (fields[i].getType().getName().equals(java.lang.String.class.getName())) {
// String type
if(listVales[j]!=null){
fields[i].set(objOne, listVales[j]);
}else{
fields[i].set(objOne, "");
}
} else if (fields[i].getType().getName().equals(java.lang.Integer.class.getName())
|| fields[i].getType().getName().equals("int")) {
// Integer type
if(listVales[j]!=null){
fields[i].set(objOne, (int)Double.parseDouble(listVales[j]));
}else{
fields[i].set(objOne, -1);
}
}else if(fields[i].getType().getName().equals("Date")){
//date type
if(listVales[j]!=null){
fields[i].set(objOne, Date.parse(listVales[j]));
}
}else if(fields[i].getType().getName().equals("Double")
||fields[i].getType().getName().equals("float")){
//double
if(listVales[j]!=null){
fields[i].set(objOne, Double.parseDouble(listVales[j]));
}else{
fields[i].set(objOne, 0.0);
}
}
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
break;
}
}
}
return objOne;
}
}
I hope this article is helpful to everyone's JSP programming.