//在springmvc中配置
            <bean class="org.springframework.http.converter.StringHttpMessageConverter"/>
            <bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/>
            <bean class="org.springframework.http.converter.BufferedImageHttpMessageConverter"/>
               <bean class
 
="org.springframework.http.converter.StringHttpMessageConverter" />


//controller寫法
@RequestMapping("download.do")
    public ResponseEntity<byte[]> download(HttpServletRequest request,HttpServletResponse response,String pictureFile) throws Exception{
        File file=new File("F:\\upload\\image\\"+pictureFile);  
        HttpHeaders headers 
 
= new HttpHeaders();    
        pictureFile=new String(pictureFile.getBytes("UTF-8"),"iso-8859-1");//為了解決中文名稱亂碼問題  
        headers.setContentDispositionFormData("attachment", pictureFile);   
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);   
        return new ResponseEntity<byte
 
[]>(FileUtils.readFileToByteArray(file),    
                                          headers, HttpStatus.CREATED);    
        
    }

springmvc實現文件下載