controller实现pdf的下载功能

上代码：

    /**
     * @param lsh
     * @param ywlxdm
     * @return
     * @throws Exception
     */
    @RequestMapping(value = "/viewPdf", produces = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
    public ResponseEntity<byte[]> viewPdf(String lsh, String ywlxdm) throws Exception {
        byte[] content = fpfwCenterService.viewPdf(lsh, ywlxdm);
        ResponseEntity<byte[]> response = null;
        HttpHeaders headers = new HttpHeaders();
        //这行代码比较重要，有这个属性则告知浏览器下载文件，无则使用浏览器打开PDF
        headers.setContentDispositionFormData("name", "filename");

        headers.setContentType(MediaType.parseMediaType("application/pdf"));
        headers.setCacheControl("must-revalidate, post-check=0, pre-check=0");
        response = new ResponseEntity<byte[]>(content, headers, HttpStatus.OK);
        return response;
    }

 byte[] content = fpfwCenterService.viewPdf(lsh, ywlxdm);
content为读取到的PDF二进制数组，以上即可实现PDF浏览器端的相关操作。