如何在Rest Web服务中获取ServletContext

我正在使用Jersey实现rest web服务。 我需要有ServletContext的对象将文件保存在应用程序目录中。 请帮助我了解上下文。

我从android设备调用这个web服务。

提前致谢。

@Path("notice") public class NoticeResources { @Resource private ServletContext context; @POST @Path("uploadphoto") @Consumes(MediaType.MULTIPART_FORM_DATA) @Produces("text/plain") public String uploadNotices(@FormDataParam("file") InputStream uploadedInputStream) { File photoDirectory = new File("\\photo"); // if the directory does not exist, create it if (!photoDirectory.exists()) { boolean result = photoDirectory.mkdir(); if(result){ System.out.println("DIR created"); } } String rootPath = photoDirectory.getAbsolutePath(); String uploadedFileLocation = rootPath + "\\photo.jpg"; // save it try { writeToFile(uploadedInputStream, uploadedFileLocation); } catch(Exception e) { return "no" + rootPath; } return "yes" + rootPath; } // save uploaded file to new location private void writeToFile(InputStream uploadedInputStream, String uploadedFileLocation) throws Exception { OutputStream out = new FileOutputStream(new File(uploadedFileLocation)); int read = 0; byte[] bytes = new byte[1024]; out = new FileOutputStream(new File(uploadedFileLocation)); while ((read = uploadedInputStream.read(bytes)) != -1) { out.write(bytes, 0, read); } out.flush(); out.close(); } } 

Answer 1

使用@Context，这是Jersey 文档

 @Context private ServletContext context; 

更新 – 如果需要，您还可以直接注入方法

 public String uploadNotices(@Context ServletContext context, ...) 

Answer 2

使用注释@context（方法级别注入）

 public Response getContext(@Context HttpServletRequest req, @Context HttpServletResponse res)throws Exception { System.out.println("Context Path is:"+req.getRequestURL().toString()); result=req.getRequestURL().toString(); return Response.status(200).entity(result).build(); }