java - 为什么使用 JAX-RS 与 JAX-RS 时浏览器中的下载弹出窗口不显示标准servlet？

Question

当我尝试使用标准 servlet 方法时，浏览器中会显示弹出窗口，询问我是否打开 .xls 文件或保存它。

我通过JAX-RS尝试了完全相同的代码，浏览器弹出窗口不会以某种方式显示。有人遇到过这种情况吗？

不显示弹出窗口的 JAX-RS 方式:

@Path("excellaTest")
public class ExcellaTestResource {
    @Context
    private UriInfo context;
    @Context
    private HttpServletResponse response;
    @Context
    private HttpServletRequest request;

    public ExcellaTestResource() {
    }


    @Path("horizontalProcess")
    @GET
    //@Produces("application/vnd.ms-excel")
    @Produces("application/vnd.ms-excel")
    public void getProcessHorizontally() {
        try {

            URL templateFileUrl = this.getClass().getResource("myExcelTemplate.xls");
            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("myExcelSheet");
            outputBook.addReportSheet(outputSheet);

            reportProcessor.addReportBookExporter(new OutputStreamExporter(response));
            reportProcessor.process(outputBook);

            System.out.println("done!!");
        }
        catch(Exception e) {
            System.out.println(e);
        }

        return;
    }


}//end class


class OutputStreamExporter extends ReportBookExporter {

    private HttpServletResponse response;

    public OutputStreamExporter(HttpServletResponse response) {
        this.response = response;
    }

    //ReportProcessor output()
    //This method is call when ReportProcessor process() is invoked.
    //The Workbook from POI API can be used to write to stream

    @Override
    public void output(Workbook book, BookData bookdata, ConvertConfiguration configuration) throws ExportException {

        //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

Answer 1

您使用什么 JAX-RS 框架？

我的猜测是您的代码不起作用，因为您返回的是 void。您使用的框架可能会将 void 识别为 HTTP 204 No Content。 这会导致浏览器跳过实际的响应正文并忽略内容处置 header 。

正如我已经在并行线程中写给您的:尝试返回 Response 对象。您可以将 OutputStream 或 byte[] 作为实体来设置内容处置 header 。