[英]how to return excel in Struts2 result?
我正在尝试从我的 struts2 操作 class 返回一张 Excel 表。
我不确定应该使用哪种结果类型? 有没有人试图从 struts2 行动 class 返回 excel?
我希望用户看到打开/保存/取消对话框
Omnipresent 涵盖了您在 struts.xml 中需要的内容。 我也在添加一个带有 Action 的示例:
InputStream excelStream
String contentDisposition
String documentFormat = "xlsx"
String excel() {
ServletContext servletContext = ServletActionContext.getServletContext()
String filePath = servletContext.getRealPath("/WEB-INF/template/excel/mytemplate.${documentFormat}")
File file = new File(filePath)
Workbook wb = WorkbookFactory.create(new FileInputStream(file))
Sheet sheet = wb.getSheetAt(0)
<write to excel file>
ByteArrayOutputStream baos = new ByteArrayOutputStream()
wb.write(baos)
excelStream = new ByteArrayInputStream(baos.toByteArray())
contentDisposition = "filename=\"myfilename.${documentFormat}\""
return SUCCESS
}
String getExcelContentType() {
return documentFormat == "xlsx" ? "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" : "application/vnd.ms-excel"
}
我正在使用 poi model: org.apache.poi.ss.usermodel。
如果需要,您可以将“xlsx”替换为“xls”。
支柱.xml:
<action name="myaction" class="com.example.MyAction" method="excel">
<result type="stream">
<param name="contentType">${excelContentType}</param>
<param name="inputName">excelStream</param>
<param name="contentDisposition">contentDisposition</param>
<param name="bufferSize">1024</param>
</result>
</action>
(添加分号和内容以翻译成有效的 Java)
您可以使用Stream 结果类型
一个示例将如下所示:
<result name="excel" type="stream">
<param name="contentType">application/vnd.ms-excel</param>
<param name="inputName">excelStream</param>
<param name="contentDisposition">attachment; filename="${fileName}"</param>
<param name="bufferSize">1024</param>
<param name="contentLength">${contentLength}</param>
</result>
excelStream
将是您操作中的一个方法 class, contentLength
将是 stream 的长度, fileName
将是一个返回文件名的 getter。
如果需要在Struts 2中使用POI/HSSF动态生成一个Excel文件并返回,
JSP
<s:url action="DownloadExcel.action" var="downloadUrl">
</s:url>
<s:a href="%{downloadUrl}">Click to Download</s:a>
动作方法
@Action(value = "DownloadExcel")
public void download() throws Exception {
HttpServletRequest request = ServletActionContext.getRequest();
HttpServletResponse response = ServletActionContext.getResponse();
String filename = "report.xlsx"; // or any other filename strategy
String mimeType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
String characterEncoding = response.getCharacterEncoding();
if (characterEncoding != null) {
mimeType += "; charset=" + characterEncoding;
}
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment;filename=" + filename);
XSSFWorkbook workbook = new XSSFWorkbook();
XSSFSheet sheet = workbook.getSheetAt(0);
// Fill out workbook as necessary... (simple example)
XSSFRow row = sheet.createRow(0);
XSSFCell cell = row.createCell(0);
cell.setCellValue("test");
//...
ServletOutputStream out = null;
try {
out = response.getOutputStream();
workbook.write(out);
workbook.close();
} catch (IOException e) {
log.error("Failed to write into response - fileName=" + filename + ", mimeType=" + mimeType, e);
}
finally {
if (out != null) {
out.flush();
out.close();
}
}
}
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