如何在JAX-RS中设置响应头，以便用户看到Excel的下载popup窗口？
我编写了使用REST JAX-RS生成Excel文件的代码，并确认生成的Excel文件位于GlassFish服务器目录中。
但是我的目标是当用户点击button（生成Excel .xls）时，我想下载popup窗口，显示询问用户是否要保存或打开.xls文件，就像其他Web服务一样，下载任何types的文件。
根据我的search，步骤是：
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生成Excel .xls（DONE）
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写excelstream
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在JAX-RS文件中，将响应头设置为类似的东西，
String fileName =“Blah_Report.xls”; response.setHeader（“Content-Disposition”，“attachment; filename =”+ fileName）;
我的问题是我在JAX-RS文件中做了所有这一切，我没有可用的HttpServletResponse对象。
根据添加响应头到JAX-RS Webservice的答案
他说：
你可以在你的webservice中通过@Context注释来注入对实际HttpServletResponse的引用，并使用addHeader（）等来添加你的头文件。
没有示例代码，我无法确切地说明究竟是什么意思。
您不需要HttpServletResponse在响应上设置标题。 你可以使用javax.ws.rs.core.Response来完成。 只要让你的方法返回响应而不是实体：
return Response.ok(entity).header("Content-Disposition", "attachment; filename=" + fileName).build() 如果您仍想使用HttpServletResponse，则可以将其注入到其中一个类字段，或者使用属性或方法参数：
@Path("/resource") class MyResource { // one way to get HttpServletResponse @Context private HttpServletResponse anotherServletResponse; // another way Response myMethod(@Context HttpServletResponse servletResponse) { // ... code } }
@Context ServletContext ctx; @Context private HttpServletResponse response; @GET @Produces(MediaType.APPLICATION_OCTET_STREAM) @Path("/download/{filename}") public StreamingOutput download(@PathParam("filename") String fileName) throws Exception { final File file = new File(ctx.getInitParameter("file_save_directory") + "/", fileName); response.setHeader("Content-Length", String.valueOf(file.length())); response.setHeader("Content-Disposition", "attachment; filename=\""+ file.getName() + "\""); return new StreamingOutput() { @Override public void write(OutputStream output) throws IOException, WebApplicationException { Utils.writeBuffer(new BufferedInputStream(new FileInputStream(file)), new BufferedOutputStream(output)); } }; }
我想通过标准的servlet来设置HTTP响应头和stream来在浏览器中显示下载popup。 注意：我正在使用Excella，excel输出API。
package local.test.servlet; import java.io.IOException; import java.net.URL; import java.net.URLDecoder; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import local.test.jaxrs.ExcellaTestResource; import org.apache.poi.ss.usermodel.Workbook; import org.bbreak.excella.core.BookData; import org.bbreak.excella.core.exception.ExportException; import org.bbreak.excella.reports.exporter.ExcelExporter; import org.bbreak.excella.reports.exporter.ReportBookExporter; import org.bbreak.excella.reports.model.ConvertConfiguration; import org.bbreak.excella.reports.model.ReportBook; import org.bbreak.excella.reports.model.ReportSheet; import org.bbreak.excella.reports.processor.ReportProcessor; @WebServlet(name="ExcelServlet", urlPatterns={"/ExcelServlet"}) public class ExcelServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { URL templateFileUrl = ExcellaTestResource.class.getResource("myTemplate.xls"); // /C:/Users/m-hugohugo/Documents/NetBeansProjects/KogaAlpha/build/web/WEB-INF/classes/local/test/jaxrs/myTemplate.xls System.out.println(templateFileUrl.getPath()); String templateFilePath = URLDecoder.decode(templateFileUrl.getPath(), "UTF-8"); String outputFileDir = "MasatoExcelHorizontalOutput"; ReportProcessor reportProcessor = new ReportProcessor(); ReportBook outputBook = new ReportBook(templateFilePath, outputFileDir, ExcelExporter.FORMAT_TYPE); ReportSheet outputSheet = new ReportSheet("MySheet"); outputBook.addReportSheet(outputSheet); reportProcessor.addReportBookExporter(new OutputStreamExporter(response)); System.out.println("wtf???"); reportProcessor.process(outputBook); System.out.println("done!!"); } catch(Exception e) { System.out.println(e); } } //end doGet() @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } }//end class class OutputStreamExporter extends ReportBookExporter { private HttpServletResponse response; public OutputStreamExporter(HttpServletResponse response) { this.response = response; } @Override public String getExtention() { return null; } @Override public String getFormatType() { return ExcelExporter.FORMAT_TYPE; } @Override public void output(Workbook book, BookData bookdata, ConvertConfiguration configuration) throws ExportException { System.out.println(book.getFirstVisibleTab()); System.out.println(book.getSheetName(0)); //TODO write to stream try { response.setContentType("application/vnd.ms-excel"); response.setHeader("Content-Disposition", "attachment; filename=masatoExample.xls"); book.write(response.getOutputStream()); response.getOutputStream().close(); System.out.println("booya!!"); } catch(Exception e) { System.out.println(e); } } }//end class
