restful文件下载功能实现

本文详细介绍了如何在RESTful API设计中实现文件下载功能,包括设置响应头、创建下载链接以及处理不同类型的文件等内容。

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        private static final byte[] UTF8_BOM = {(byte)0xEF, (byte)0xBB, (byte)0xBF};
        private static final String FAV_ICO = "fav.ico";
        @GET
        @Path("/getFile")
        @Produces(MediaType.APPLICATION_OCTET_STREAM)
        public Response getFile(@PathParam("fileName") String fileName) throws IOException{
            ByteArrayOutputStream bos = new ByteArrayOutputStream();

            ZipOutputStream zos = new ZipOutputStream(bos);

            try {
              zos.putNextEntry(new ZipEntry("utf-8.txt"));
              zos.write(UTF8_BOM);
              zos.write("这是一段UTF-8文本".getBytes("UTF-8"));
              zos.closeEntry();
              zos.flush();
              zos.finish();
              return Response.ok(bos.toByteArray(), "application/zip")
                .header("Content-Disposition", "attachment; filename=demo2.zip")
                .build();
            } catch (IOException e) {
              throw new RuntimeException(e);
            } finally {
              try {
                zos.close();
              } catch (IOException e) {}
            }
        }
        @GET
        @Path("/getMyFile")
        @Produces(MediaType.APPLICATION_OCTET_STREAM)
        public Response getMyFile() throws IOException{
            File file = new File("123.txt");
            file.createNewFile();
            long fileLength = file.length();
            ResponseBuilder responseBuilder = Response.ok(file);
            responseBuilder.type("application/x-msdownload");
            responseBuilder.header("Content-Disposition", "attachment; filename="
                    + URLEncoder.encode("123.txt", "UTF-8"));
            responseBuilder.header("Content-Length", Long.toString(fileLength));
            Response response = responseBuilder.build();
            return response;
        }
restful restful所需要的jar包 ========================================= Restlet, a RESTful Web framework for Java ========================================= http://www.restlet.org ----------------------------------------- Native REST support * Core REST concepts have equivalent Java classes (UniformInterface, Resource, Representation, Connector for example). * Suitable for both client-side and server-side web applications. The innovation is that that it uses the same API, reducing the learning curve and the software footprint. * Restlet-GWT module available, letting you leverage the Restlet API from within any Web browser, without plugins. * Concept of "URIs as UI" supported based on the URI Templates standard. This results in a very flexible yet simple routing with automatic extraction of URI variables into request attributes. * Tunneling service lets browsers issue any HTTP method (PUT, DELETE, MOVE, etc.) through a simple HTTP POST. This service is transparent for Restlet applications. Complete Web Server * Static file serving similar to Apache HTTP Server, with metadata association based on file extensions. * Transparent content negotiation based on client preferences. * Conditional requests automatically supported for resources. * Remote edition of files based on PUT and DELETE methods (aka mini-WebDAV mode). * Decoder service transparently decodes compressed or encoded input representations. This service is transparent for Restlet applications. * Log service writes all accesses to your applications in a standard Web log file. The log format follows the W3C Extended Log File Format and is fully customizable. * Powerful URI based redirection support similar to Apache Rewrite module. Available Connectors * Multiple server HTTP connectors available, based on either Mortbay's Jetty or the Simple framework or Grizzly NIO framework. * AJP server connector available to let you plug behind an Apache HTT
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