1. Excel import and export
1. Export to Excel through the local export template (suitable for more complicated export of headers)
This is the template I put locally
The following is the method I exported
I put the queried data into a two-dimensional array and export it by reading the data of the two-dimensional array
The data after exporting is
2. Export data through excel via POI
Go directly to the code, you need to create a user entity class yourself
@Override
public void downloadFile(HttpServletRequest request,HttpServletResponse response) {
try {
User users = new User();
users.setId("1222");
users.setUsername("张三");
users.setPhone("1760767162");
users.setAddress("深圳塘朗");
users.setCardno("4325241995086246");
users.setTitel("java删库到跑路");
users.setState("");
//获取数据
List<User> list = new ArrayList<User>();
list.add(users);
// excel title
String[] title = {"student name", "mobile phone number", "ID number", "address", "course name", "course payment status", "id"};
// excel file name
String fileName = "agent"+users.getUsername()+" enrollment information statistics table" + System.currentTimeMillis() + ".xls";
// CellRangeAddress callRangeAddress = new
// CellRangeAddress(0, 0,0,6);//start row, end row, start column, end column
// sheet名
String sheetName = "招生信息统计表22";
String[][] content = new String[list.size()][title.length];
String state = "";
for (int i = 0; i < list.size(); i++) {
// content[i] = new String[title.length];
User user = list.get(i);
if(null != user.getState()){
state="已付费";
}else {
state = "未付费";
}
/*
* Date date = obj.getReportDate(); content[i][0] =
* sDateFormat.format(date);
*/
content[i][0] = user.getUsername();
content[i][1] = user.getPhone() + "";
content[i][2] = user.getCardno() + "";
content[i][3] = user.getAddress() + "";
content[i][4] = user.getTitel();
content[i][5] = state;
content[i][6] = user .getId();
}
//The content of the merged cell
String mergeCell = "Agent"+users.getUsername()+"Total number of students enrolled:"+list.size()+"people";
Integer cellNum = 5;//Merge 6 columns of cells
// Create
HSSFWorkbook // HSSFWorkbook wb1 = new HSSFWorkbook();
HSSFWorkbook wb = ExcelUtil.getHSSFWorkbook(sheetName, title, content, null,mergeCell,cellNum);
// File errFile = new File(CoinConfig.RESOURCE_BASIC_PATH+"/"
// +fileName);
// 响应到客户端
try {
this.setResponseHeader(response, fileName);
OutputStream os = response.getOutputStream();
// OutputStream os = new FileOutputStream(errFile);
wb.write(os);
os.flush();
os.close();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) { log.error("Download failed", e); } }
Tool method
public class ExcelUtil {
/**
* Export Excel
* @param sheetName sheet name
* @param title title
* @param values content
* @param wb HSSFWorkbook object
* @return
*/
public static HSSFWorkbook getHSSFWorkbook(String sheetName,String []title,String [][ ]values, HSSFWorkbook wb,String mergeCell,Integer cellNum ){
// The first step is to create a HSSFWorkbook, corresponding to an Excel file
if(wb == null){ wb = new HSSFWorkbook(); }
// The second step is to add a sheet to the workbook, corresponding to the sheet
HSSFSheet sheet in the Excel file = wb.createSheet(sheetName);
// The third step is to add row 0 of the header to the sheet. Note that the old version of poi has a limit on the number of rows and columns of Excel.
HSSFRow row = sheet.createRow(0);
// The fourth step is to create a cell and set the value header. Set the header to be centered.
HSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // Create a centered format
//Declare the column object
HSSFCell cell = null;
if (StringUtils.isNotEmpty(mergeCell)) { //Merge cell CellRangeAddress callRangeAddress = new CellRangeAddress(0,0,0,cellNum);//Start row, end row, start Start column, end column sheet.addMergedRegion(callRangeAddress); cell = row.createCell(0); cell.setCellValue(mergeCell); cell.setCellStyle(style); row = sheet.createRow(1); // HSSFCell cell = null ; //Create title for(int i=0;i<title.length;i++){ cell = row.createCell(i); cell.setCellValue(title[i]);
cell.setCellStyle(style);
}
//Create content
for(int i=0;i<values.length;i++){ row = sheet.createRow(i + 2); for(int j=0;j<values[i].length;j++){ //Assign the content to the corresponding column object in order row.createCell(j).setCellValue(values[i][j]); } } }else{ // HSSFCell cell = null; //Create title for(int i =0;i<title.length;i++){ cell = row.createCell(i); cell.setCellValue(title[i]); cell.setCellStyle(style); }
//Create content
for(int i=0;i<values.length;i++){ row = sheet.createRow(i + 1); for(int j=0;j<values[i].length;j++){ //Assign the content to the corresponding column objects in order row.createCell(j).setCellValue(values[i][j]); } } } return wb; } } 3. You can export by configuring the html template