控制器方法，它调用服务并使用apache-poi生成xlsx并返回视图。
@RequestMapping(value = "/getSummary", method = RequestMethod.GET)
public String getSummary(Model model, HttpServletRequest request,
HttpServletResponse response,
@ModelAttribute("dateFrom") String dateFrom,
@ModelAttribute("dateTo") String dateTo) throws Exception {
logger.debug("date=" + dateFrom + "TO date=" + dateTo);
AuthParam authParam = (AuthParam) request.getSession().getAttribute("authParam");
if (authParam == null) {
model.addAttribute("success", false);
model.addAttribute("error_msg", "Auth Failed.");
return "shipment/getSummary";
}
try {
List<SummaryResponse> summaryBeanResponse = reportClient.getSummary(authParam, dateFrom, dateTo);
logger.debug("Result List Size : {}", summaryBeanResponse.size());
if (summaryBeanResponse.size() > 0) {
byte[] reportBytes = buildSummaryXlsx(summaryBeanResponse, dateTo);
logger.debug("Xlsx Sheet Generated!!");
String fileName = "summary_" + StringUtils.join(dateTo.split("-"), "_") + ".xlsx";
model.addAttribute("success", true);
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
response.setHeader("content-disposition", "attachment; filename=" + fileName);
logger.debug("Content-Type : {}", response.getContentType());
logger.debug("Header : {}", response.getHeader("Content-Disposition"));
response.getOutputStream().write(reportBytes);
logger.debug("Set ALL");
} else {
model.addAttribute("success", false);
model.addAttribute("error_msg", "No data found by search.");
}
} catch (Exception ex) {
model.addAttribute("success", false);
model.addAttribute("error_msg", "Service error.");
logger.error("ERROR on report xlsx", ex);
}
return "shipment/getSummary";
}
private byte[] buildSummaryXlsx(List<SummaryResponse> summaryResponseList, String date) throws Exception {
try {
Workbook workbook = new XSSFWorkbook();
// create excel xls sheet
XSSFSheet sheet = (XSSFSheet) workbook.createSheet("summary");
sheet.setDefaultColumnWidth(14);
// create style for header cells
XSSFCellStyle headerStyle = (XSSFCellStyle) workbook.createCellStyle();
Font font = workbook.createFont();
font.setFontName("Arial");
headerStyle.setFont(font);
headerStyle.setAlignment(HorizontalAlignment.CENTER);
headerStyle.setVerticalAlignment(VerticalAlignment.CENTER);
int rowCount = 0;
int cellCount = 0;
// Manipulating Data Using Apache-POI
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
workbook.write(byteArrayOutputStream);
return byteArrayOutputStream.toByteArray();
} catch (Exception ex) {
logger.debug("Exception On Population Xlsx Sheet, {}", ex);
}
return null;
}
这是 JSP 视图名称getSummary.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>Get Xlsx report</title>
<script type="text/javascript">
$(document).ready(function () {
var isSuccess = ${success};
if (isSuccess == false) {
var msg = "${error_msg}";
alertify.alert(msg, function() {
window.location = "<%= request.getContextPath() %>/shipment/view.html";
});
}
});
</script>
</head>
<body>
${error_msg}
</body>
</html>
我正在设置内容类型，但响应标头看起来像
**Response Headers**
HTTP/1.1 200 OK
Cache-Control: no-cache
Cache-Control: no-store
Date: Mon, 31 Jul 2017 12:26:12 GMT
Pragma: no-cache
Transfer-Encoding: chunked
Content-Type: text/html;charset=UTF-8
Expires: Thu, 01 Jan 1970 00:00:00 GMT
Content-Disposition: attachment; filename=summary_2017_07_31.xlsx
Set-Cookie: JSSESSIONID=1501503972634; path=/
Content-Language: en
打印日志：
2017-07-31 18:26:12,635 DEBUG [admin] (ShipmentController.java:522) - REPORT date=2017-07-1TO date=2017-07-31
2017-07-31 18:26:12,635 DEBUG [admin] (ReportServiceClient.java:178) - Calling [ReportService.getSummary] service for dateFrom[2017-07-1] and dateTo[2017-07-31]
2017-07-31 18:26:12,671 DEBUG [admin] (ShipmentController.java:531) - Result List Size : 4
2017-07-31 18:26:12,824 DEBUG [admin] (ShipmentController.java:534) - Xlsx Sheet Generated!!
2017-07-31 18:26:12,824 DEBUG [admin] (ShipmentController.java:539) - Content-Type : application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
2017-07-31 18:26:12,824 DEBUG [admin] (ShipmentController.java:540) - Header : attachment; filename=summary_2017_07_31.xlsx
2017-07-31 18:26:12,824 DEBUG [admin] (ShipmentController.java:542) - Set ALL
我可以下载 xlsx 文件，但数据已损坏。实际上网页内容/html页面视图是用xlsx文件编写的。
当没有数据时，我想显示弹出窗口，当有数据时，我想下载创建的 xlsx。
为什么在我设置后内容类型会更改。 我怎样才能正确解决这个问题。
铌： 我有一个类似类型的控制器方法，我在其中创建一个 pdf 文件并将内容类型设置为response.setContentType("application/pdf")它对我来说工作正常。
您需要添加一个单独的控制器@RequestMapping，该控制器仅返回XLSX文件字节，并用@ResponseBody注释。然后，您可以从 JSP 的主体中创建指向此端点的超链接，以便当用户单击它时，他们可以下载该文件。尝试在单个RequestMapping中同时返回 JSP 正文和 XLSX 内容是行不通的，因为包含 JSP 的返回类型设置为text/html。