我正在向servlet发送一个json对象并通过一个函数调用servlet。这是我的jsp页面和功能：
<script type="text/javascript">
function retrieveTicketsExcel(){
var jsonData = {};
jsonData["tower"]=$('#appTower').val();
jsonData["sDate"]=$('#startDate').val();
jsonData["eDate"]=$('#endDate').val();
jsonData["apps"]=$('#appfilter').html();
jsonData["duration"]=$('#duration').val();
jsonData["severity"]=$('#severity').val();
jsonData["releasetype"]=$('#releasetype').val();
jsonData["query"]=$('#query').val();
$.ajax
({
type: "GET",
url:"retrieveTicketsToExcel.htm",
data:'requestData='+JSON.stringify(jsonData),
dataType: "json",
});
}
</script>
<div class="modal-footer">
<input type="button" class="btn btn-default" value="Export" onclick="javascript:retrieveTicketsExcel();">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
现在我调用的是Servlet方法：
@RequestMapping(value = "/retrieveTicketsToExcel.htm", method = RequestMethod.GET)
public void retrieveTickets(@RequestParam("requestData") String requestData, HttpServletRequest request, HttpServletResponse response) throws IOException {
// UserDAO userDAO = new UserDAO();
// userDAO.setDataSource(dataSource);
System.out.println("*****************/GRTBDashboard/retrieveTicketsToExcel****************");
Map<String, String> requestMap = new Gson().fromJson(requestData, Map.class);
response.reset();
response.resetBuffer();
response.setContentType("application/vnd.ms-excel");
response.addHeader("Cache-control", "no-cache");
response.setHeader("Content-disposition", "Attachment;filename=\"Ticket_Details.xls\"");
ServletOutputStream fileOut = response.getOutputStream();
System.out.println("retrieveTickets - > " + requestData);
List<DashboardData> dashboardDataList = null;
String tower = requestMap.get("tower");
System.out.println(tower);
try {
dashboardDataList = userDAO.retrieveTickets(requestMap);
} catch (SQLException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
}
final double noOfRecords = dashboardDataList.size();
double count = Math.ceil(noOfRecords / 30000);
try {
HSSFWorkbook workbook = new HSSFWorkbook();
short dateFormat = workbook.createDataFormat().getFormat("YYYY-MM-DD HH:mm");
Iterator<DashboardData> iterator = dashboardDataList.iterator();
for (int i = 1; i <= count; i++) {
int c1 = 1;
HSSFSheet sheet = workbook.createSheet(tower);
HSSFCellStyle style = workbook.createCellStyle();
HSSFFont font = workbook.createFont();
font.setFontName("Verdana");
style.setFillForegroundColor(HSSFColor.GREY_40_PERCENT.index);
style.setFillPattern(style.SOLID_FOREGROUND);
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
font.setColor(HSSFColor.BLACK.index);
style.setFont(font);
HSSFRow header = sheet.createRow(0);
;
header.createCell((short) 0).setCellValue(new HSSFRichTextString("Type"));
header.getCell((short) 0).setCellStyle(style);
header.createCell((short) 1).setCellValue(new HSSFRichTextString("Ticket Number"));
header.getCell((short) 1).setCellStyle(style);
header.createCell((short) 2).setCellValue(new HSSFRichTextString("Open Date"));
header.getCell((short) 2).setCellStyle(style);
header.createCell((short) 3).setCellValue(new HSSFRichTextString("Closed Date"));
header.getCell((short) 3).setCellStyle(style);
header.createCell((short) 4).setCellValue(new HSSFRichTextString("Reported By"));
header.getCell((short) 4).setCellStyle(style);
header.createCell((short) 5).setCellValue(new HSSFRichTextString("Severity"));
header.getCell((short) 5).setCellStyle(style);
header.createCell((short) 6).setCellValue(new HSSFRichTextString("Assigned App"));
header.getCell((short) 6).setCellStyle(style);
header.createCell((short) 7).setCellValue(new HSSFRichTextString("Status"));
header.getCell((short) 7).setCellStyle(style);
int rowIndex = 1;
while (iterator.hasNext() && c1 <= 30000) {
DashboardData dashboardData = iterator.next();
System.out.println("Data : "+dashboardData.getTicketNumber());
HSSFRow row = sheet.createRow(rowIndex++);
HSSFCell cell0 = row.createCell((short) 0);
cell0.setCellValue(new HSSFRichTextString(dashboardData.getType()));
HSSFCell cell1 = row.createCell((short) 1);
cell1.setCellValue(new HSSFRichTextString(dashboardData.getTicketNumber()));
HSSFCell cell2 = row.createCell((short) 2);
cell2.setCellValue(new HSSFRichTextString(dashboardData.getOpenDate().toString()));
HSSFCell cell3 = row.createCell((short) 3);
cell3.setCellValue(new HSSFRichTextString(dashboardData.getClosedate().toString()));
HSSFCell cell4 = row.createCell((short) 4);
cell4.setCellValue(new HSSFRichTextString(dashboardData.getReportedBy()));
HSSFCell cell5 = row.createCell((short) 5);
cell5.setCellValue(new HSSFRichTextString(dashboardData.getPriority()));
HSSFCell cell6 = row.createCell((short) 6);
cell6.setCellValue(new HSSFRichTextString(dashboardData.getAssignedGroup()));
HSSFCell cell7 = row.createCell((short) 7);
cell7.setCellValue(new HSSFRichTextString(dashboardData.getStatus()));
c1++;
}
for (int autosize = 0; autosize <= 10; autosize++) {
sheet.autoSizeColumn((short) autosize);
}
}
workbook.write(fileOut);
} catch (FileNotFoundException e2) {
e2.printStackTrace();
} finally {
if (null != fileOut)
fileOut.close();
}
fileOut.close();
fileOut.flush();
}
我正在尝试将数据清除为我正在编写的excel，但是点击导出按钮除了在jsp页面上提供下载外。
如果我正在尝试使用FileOutputStream()进行书写，那么它在我的光盘上写得非常完美。但我想在jsp页面中使用response.getOutputStream()进行下载。
答案 0 :(得分：0)
也许问题出在JQuery方面？
您可以通过在浏览器中手动打开retrieveTicketsToExcel.htm来获得下载吗？如果是这样，那么尝试使用window.location.href="retrieveTicketsToExcel.htm"而不是JQuery的ajax（）;
编辑：
我现在很确定问题出在Query端。首先，ajax请求无法启动文件下载对话框。 window.location.href或提交表格是您的选择。
此外，您在ajax调用中提供json作为dataType。这是错误的，因为dataType指定了您期望从服务器返回的数据类型，而不是您发送的请求的格式（http://api.jquery.com/jquery.ajax/）
EDIT2：
您对data:'requestData='+JSON.stringify(jsonData)的使用也存在问题。您不能简单地将JSON字符串附加到网址。您需要先对其进行编码。尝试使用
data:'requestData='+ encodeURI(JSON.stringify(jsonData))
或者更好的是，使用POST请求，因为这似乎在语义上更正确。这样你就不需要requestData=部分，但也需要稍微更改servlet代码。您需要直接从Servlet inputStream或reader中读取json。
这样的事情：
new Gson().fromJson(request.getReader(), Map.class);;