springMVC方法，导出/下载文件。

研究的不深，先贴代码，日后再说。

@RequestMapping(value = "/form/printContract")public ResponseEntity<byte[]> printContract(ContractIreportForm form)throws Exception {HttpHeaders headers = new HttpHeaders();//声明变量File file = null ;try {file = new File("");String downFileName = new String(("").getBytes("UTF-8"),"iso-8859-1");headers.setContentDispositionFormData("attachment", downFileName);       headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);     form.setIsSuccess(SUCCESS);} catch (Exception e) {form.setIsSuccess(FAILURE);form.setMsg(exMsg(e));}return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),                    headers, HttpStatus.CREATED);  }