下面的代码解决了我的问题：
@RequestMapping(value = URIConstansts.GET_FILE, produces = { "application/json" }, method = RequestMethod.GET)public @ResponseBody ResponseEntity getFile(@RequestParam(value="fileName", required=false) String fileName,HttpServletRequest request) throws IOException{ ResponseEntity respEntity = null; byte[] reportBytes = null; File result=new File("/home/arpit/documents/PCAP/dummyPath/"+fileName); if(result.exists()){ InputStream inputStream = new FileInputStream("/home/arpit/documents/PCAP/dummyPath/"+fileName); String type=result.toURL().openConnection().guessContentTypeFromName(fileName); byte[]out=org.apache.commons.io.IOUtils.toByteArray(inputStream); HttpHeaders responseHeaders = new HttpHeaders(); responseHeaders.add("content-disposition", "attachment; filename=" + fileName); responseHeaders.add("Content-Type",type); respEntity = new ResponseEntity(out, responseHeaders,HttpStatus.OK); }else{ respEntity = new ResponseEntity ("File Not Found", HttpStatus.OK); } return respEntity;}
