Chapter 3 business function development (choose to export market activities, Apache POI)

customer demand ：

Users are on the main page of marketing activities , Select campaign to export , Click on " Choose export " Button , Generate one from all the selected data excel file , The dialog box of file download pops up ;

The user selects the directory to save , Complete the function of selecting and exporting marketing activities .

    * Choose to export at least one record at a time

* After exporting successfully , The page does not refresh

Function development ：

1. Draw according to customer needs UML Sequence diagram

 2. Function development ,mapper layer

ActivityMapper Interface

 

ActivityMapper.xml

 

3.service layer

ActivityService Interface

 

ActivityServiceImpl

 

4.Controller layer

ActivityController

   @RequestMapping(value = "/workbench/activity/queryCheckedActivity.do")
    public void exportCheckedActivitys(HttpServletResponse response,HttpServletRequest request) throws IOException {
        // To obtain parameters 
        String checkedIds = request.getParameter("checkedIds");
        System.out.println(" Parameters obtained ：" + checkedIds);
        String[] ids = checkedIds.split(",");
        // call service Layer method , according to id Inquire about market activities 
        List<Activity> activityList = activityService.queryCheckedActivity(ids);
        // establish excel file , And the activityList write in excel file 
        HSSFWorkbook wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet(" List of campaigns ");
        HSSFRow row = sheet.createRow(0);
        HSSFCell cell;
        // Header 
        String[] titles = {"ID", " owner ", " name ", " Start date ", " End date ", " cost ", " describe ", " Creation time ", " The creator ", " Modification time ", " Reviser "};
        for (int i = 0; i < titles.length; i++) {
            cell = row.createCell(i);
            cell.setCellValue(titles[i]);
        }
        // Traverse the campaign items 
            if (activityList.size() > 0 && activityList != null) {
                // Traverse activityList, establish HSSFRow object , Generate all data rows 
                Activity activity = null;
                for (int i = 0; i < activityList.size(); i++) {
                    activity = activityList.get(i);
                    // Every time you traverse one activity, Generate a line 
                    row = sheet.createRow(i + 1);
                    // Create each row 11 Column , The data in each column is from activity In order to get 
                    cell = row.createCell(0);
                    cell.setCellValue(activity.getId());
                    cell = row.createCell(1);
                    cell.setCellValue(activity.getOwner());
                    cell = row.createCell(2);
                    cell.setCellValue(activity.getName());
                    cell = row.createCell(3);
                    cell.setCellValue(activity.getCreateTime());
                    cell = row.createCell(4);
                    cell.setCellValue(activity.getEndDate());
                    cell = row.createCell(5);
                    cell.setCellValue(activity.getCost());
                    cell = row.createCell(6);
                    cell.setCellValue(activity.getDescription());
                    cell = row.createCell(7);
                    cell.setCellValue(activity.getCreateTime());
                    cell = row.createCell(8);
                    cell.setCellValue(activity.getCreateBy());
                    cell = row.createCell(9);
                    cell.setCellValue(activity.getEditTime());
                    cell = row.createCell(10);
                    cell.setCellValue(activity.getEditBy());
                }
            }
        // Generative excel Download the file to the client 
        response.setContentType("application/octet-stream;charset=UTF-8");
        response.addHeader("Content-Disposition","attachment;filename=activityList.xls");
        OutputStream out=response.getOutputStream();

        wb.write(out);
        // close resource 
        wb.close();
        out.flush();

    }

5.activity Of index.jsp page

   // Add a click event to the batch export button 
        $("#exportActivityAllBtn").click(function () {
            window.location.href="workbench/activity/exportAllActivitys.do";
        });

        // Add a click event to the select export button 
        $("#exportActivityXzBtn").click(function () {
			// Collection parameters 
			var checkIds=$("#tBody input[type='checkbox']:checked");
			// validate form 
			if (checkIds.size()==0){
				alert(" Select at least one piece of data to export ");
				return;
			}
			// String concatenation 
			var checkedIds=[];
			$.each(checkIds,function (i) {
				checkedIds[i]=$(this).val();
			});
			window.location.href="workbench/activity/queryCheckedActivity.do?checkedIds="+checkedIds;
		});

A functional test ：

Enter the campaign list page , Click to download the list data （ Choose export ）, Will be automatically customized serverDir Generate excel file , Then download to the client , The excel The files in are completely from the database .

Click the select download button , When there is no choice , Pop up and select at least one campaign

Select two campaigns to download

  View the downloaded data