Spring MVC下载文件

　　直接上代码：

　　第一种写法：

    @RequestMapping(value = "download_cumstoms_declaration")
    public ModelAndView downloadCustomsDeclaration(@RequestParam(value = "batchId", required=false) Integer batchId, HttpServletResponse response) throws Exception {
        //下载
        File file = new File("D:" + File.separator + "VV" + File.separator + "EclipseWorkspace" + File.separator + "GRYB_WEB" + File.separator + "WebContent" + File.separator + "WEB-INF" + File.separator + "files" + File.separator + "test.pdf");
        InputStream inputStream = new BufferedInputStream(new FileInputStream(file));
        
        response.setContentType("application/pdf");
        response.setHeader("Content-Disposition", "attachment; filename="+ file.getName());// +".pdf"
        OutputStream outputStream = response.getOutputStream();
        IOUtils.copy(inputStream, outputStream);
        response.flushBuffer();
        inputStream.close();
        outputStream.close();
    }

　　第二种写法：使用ResponseEntity<byte[]>作为返回值

public class SpringDownloadUtils {
    
    public static ResponseEntity<byte[]> getResponseEntity(String fileName, File file) throws IOException {
        
        HttpHeaders headers = new HttpHeaders();
        String fileNameAtferEncoding = new String((fileName).getBytes("UTF-8"),"iso-8859-1");//为了解决中文名称乱码问题  
        headers.setContentDispositionFormData("attachment", fileNameAtferEncoding);   
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),    
                headers, HttpStatus.CREATED);
    }
}

　　

 

 

　　注意，如果是显示PDF，让浏览器处理，则是如下的写法（类似于css文件，也是直接在controller返回一个ModelAndView对象，如果以如上的方式返回css文件，在浏览器端应该会是下载）

    @RequestMapping(value = "download_cumstoms_declaration")
    public ModelAndView downloadCustomsDeclaration(@RequestParam(value = "batchId", required=false) Integer batchId, HttpServletResponse response) throws Exception {
        //网页显示
        ModelAndView mav = new ModelAndView("test.pdf");
        return mav;
    }