java如何访问servlet和下载附件?
我有以下代码片段,尝试对我的servlet进行HTTP调用:
try {
// Construct data
String data = URLEncoder.encode("rpt_type", "UTF-8") + "=" + URLEncoder.encode(reportType, "UTF-8");
data += "&" + URLEncoder.encode("rpt_project", "UTF-8") + "=" + URLEncoder.encode(reportProject, "UTF-8");
data += "&" + URLEncoder.encode("rpt_mrv_creator", "UTF-8") + "=" + URLEncoder.encode(reportMrvCreator, "UTF-8");
data += "&" + URLEncoder.encode("rpt_gi_recipient", "UTF-8") + "=" + URLEncoder.encode(reportGiRecipient, "UTF-8");
data += "&" + URLEncoder.encode("rpt_plant", "UTF-8") + "=" + URLEncoder.encode(reportPlant, "UTF-8");
data += "&" + URLEncoder.encode("rpt_sloc", "UTF-8") + "=" + URLEncoder.encode(reportStorageLoc, "UTF-8");
data += "&" + URLEncoder.encode("rpt_gi_no", "UTF-8") + "=" + URLEncoder.encode(reportGiNo, "UTF-8");
data += "&" + URLEncoder.encode("date_sap_gi_fr", "UTF-8") + "=" + URLEncoder.encode(reportDateGiFrom, "UTF-8");
data += "&" + URLEncoder.encode("date_sap_gi_to", "UTF-8") + "=" + URLEncoder.encode(reportDateGiTo, "UTF-8");
data += "&" + URLEncoder.encode("rpt_partno", "UTF-8") + "=" + URLEncoder.encode(reportPartNo, "UTF-8");
data += "&" + URLEncoder.encode("rpt_so_no", "UTF-8") + "=" + URLEncoder.encode(reportSvcOrderNo, "UTF-8");
data += "&" + URLEncoder.encode("date_scan_fr", "UTF-8") + "=" + URLEncoder.encode(reportDateScanFrom, "UTF-8");
data += "&" + URLEncoder.encode("date_scan_to", "UTF-8") + "=" + URLEncoder.encode(reportDateScanTo, "UTF-8");
System.out.println("[data]\n" + data);
// Send data
String urlString = "http://localhost:8080/aerobook/GIStatusReportDownload?" + data;
System.out.println("[url] " + urlString);
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
//conn.setDoOutput(true);
//OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
//wr.write(data);
//wr.flush();
// Get the response
BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = rd.readLine()) != null) {
System.out.println(line);
}
//wr.close();
rd.close();
} catch (Exception e) {
}
我的调试输出:
[data]
rpt_type=d&rpt_project=aaa&rpt_mrv_creator=bbb&rpt_gi_recipient=ccc&rpt_plant=ddd&rpt_sloc=eee&rpt_gi_no=fff&date_sap_gi_fr=02%2F05%2F2012&date_sap_gi_to=03%2F05%2F2012&rpt_partno=ggg&rpt_so_no=hhh&date_scan_fr=26%2F05%2F2012&date_scan_to=31%2F05%2F2012
[url] http://localhost:8080/aerobook/GIStatusReportDownload?rpt_type=d&rpt_project=aaa&rpt_mrv_creator=bbb&rpt_gi_recipient=ccc&rpt_plant=ddd&rpt_sloc=eee&rpt_gi_no=fff&date_sap_gi_fr=02%2F05%2F2012&date_sap_gi_to=03%2F05%2F2012&rpt_partno=ggg&rpt_so_no=hhh&date_scan_fr=26%2F05%2F2012&date_scan_to=31%2F05%2F2012
在我的servlet上(在上面代码的单独文件中),我生成了一个Excel文件供下载:
res.setContentType(sContentType);
res.setHeader("Content-Disposition", "attachment;filename=\"" + sExcelFileName + "\"");
OutputStream oOutStrm = res.getOutputStream();
wbBook.write(oOutStrm);
oOutStrm.close();
这里我的问题是,从我的代码生成的URL(如上面的调试输出所示),我可以访问我的servlet,并设法获得“另存为”对话框
我想获取生成的文件内容,以便在代码中使用。是否有任何方法可以从我的代码中获取附件,以字节流或任何其他格式
编辑#3:清理顶部
# 1 楼答案
检查
wbBook.write(oOutStrm);
是否有任何内容已写入outputStream,并且在关闭它之前需要调用oOutStrm.flash()
# 2 楼答案
在浏览器中输入URI时,您正在执行GET请求。但是,客户端Java代码会生成POST请求,并在主体中发送参数,而不是URI
您可能需要查看HTTP跟踪并进行比较
# 3 楼答案
I want to get the contents of the excel file on my code, but so far it's not working.
我在代码中没有发现错误
我相信您希望将内容从输入流转换为
HSSFWorkbook
对象下面的代码片段将对您有所帮助
# 4 楼答案
我怀疑问题出在哪里
我打赌
res
是HttpServletResponse
,它返回适合在响应中写入二进制数据的ServletOutputStream
。servlet容器不编码二进制数据勾选API
所以,除了文件名,你可能什么也得不到
在Servlet中尝试