spring mvc如何下载文件呢?
spring mvc怎么下载图片呢?
有两种方式:
方式一:使用注解@ResponseBody
Java代码
- @ResponseBody
- @RequestMapping(value = "/download",produces="image/jpeg")
- public byte[] downloadFile(HttpServletRequest request, HttpServletResponse response,String contentType2,boolean isInline)
- throws IOException {
- byte[]bytes=FileUtils.getBytes4File("D:\\Temp\\cc.jpg");
- // response.addHeader("Content-Disposition", downloadType+";filename=\"a.jpg\"");
- WebServletUtil.setDownloadContentDisposition(isInline, "c.jpg", response);
- return bytes;
- }
WebServletUtil.setDownloadContentDisposition 的实现如下:
Java代码
- /***
- * spring MVC下载文件设置的Content-Disposition
- * @param isInline
- * @param fileName
- * @return
- */
- public static String getContentDisposition(boolean isInline,String fileName){
- String downloadType=null;
- if(isInline){
- downloadType=Constant2.CONTENT_DISPOSITION_INLINE;
- }else{
- downloadType=Constant2.CONTENT_DISPOSITION_ATTACHMENT;
- }
- if(ValueWidget.isNullOrEmpty(fileName)){
- fileName="name_not_specified";
- }
- String format=downloadType+";filename=\""+fileName+"\"";
- return format;
- }
- /***
- * 下载文件(或内联显示)时设置Content-Disposition
- * @param isInline
- * @param fileName
- * @param response
- */
- public static void setDownloadContentDisposition(boolean isInline,String fileName, HttpServletResponse response){
- response.addHeader(Constant2.CONTENT_DISPOSITION, WebServletUtil.getContentDisposition(isInline, fileName));
- }
注意:(1)一定要通过@RequestMapping注解的produces 设置response 的content type;
(2)设置应答头时要使用addHeader,而不是setHeader
方式二:使用ResponseEntity
Java代码
- @RequestMapping(value = "/download3")
- public ResponseEntity<byte[]> download() throws IOException {
- HttpHeaders headers = new HttpHeaders();
- headers.setContentType(MediaType.IMAGE_JPEG);
- // headers.setContentDispositionFormData("inline", "dict.jpg");//attachment
- headers.set(Constant2.CONTENT_DISPOSITION,WebServletUtil.getContentDisposition(true, "dict.jpg"));
- return new ResponseEntity<byte[]>(FileUtils.getBytes4File("D:\\Temp\\cc.jpg"),
- headers, HttpStatus.CREATED);
- }
Java代码
- /***
- * favicon.ico
- * @throws IOException
- */
- @RequestMapping(value = "/favicon.ico")
- public ResponseEntity<byte[]> faviconIco(HttpServletRequest request) throws IOException {
- HttpHeaders headers = new HttpHeaders();
- headers.setContentType(MediaType.IMAGE_PNG);
- String faviconIcoName="sms-4.ico";
- headers.set(Constant2.CONTENT_DISPOSITION,WebServletUtil.getContentDisposition(true, faviconIcoName));
- ///home/whuang/software/apache-tomcat-7.0.53/webapps/ROOT/
- String webappPath=null;
- if(WebServletUtil.isLocalIp(request)){//服务器在本机(访问ip为127或localhost)
- webappPath=WebServletUtil.getRealPath(request);
- }else{
- webappPath=DictionaryParam.get(Constant2.DICTIONARY_GROUP_GLOBAL_SETTING, "WEB-INF_LOC");
- }
- return new ResponseEntity<byte[]>(FileUtils.getBytes4File(
- webappPath
- +"WEB-INF/static/img/"+faviconIcoName),
- headers, HttpStatus.CREATED);
- }
注意:不要使用headers.setContentDispositionFormData 来设置Content-Disposition
