最近在做一个ssm的项目，遇到了添加附件和下载的功能，在网上查了很多资料，发现很多都不好用，经过摸索，发现了一套简便的方法，和大家分享一下。
1.文件上传
前台页面使用了easyui，代码如下：
<table><tr><td>附件</td><td><input class="easyui-filebox" type="file" name="file1" id="file1"><a href="javascript:imageUpload()" class="easyui-linkbutton">上传</a></td><td><input type="hidden" ?id="ssFile" name="ssFile"> <!--用于文件名回显--></td></tr><table
JS方法调用后台：
function imageUpload(){var file1 = document.getElementById("file1"); ?var ssFile = document.getElementById("ssFile"); ?????ssFile.value = file1.value.substring(12); ???//取出文件名，并赋值回显到文本框，用于向后台传文件名 ???????$.ajaxFileUpload({ ???????????url : ‘${pageContext.request.contextPath}/bug/uploadFile.do‘, //用于文件上传的服务器端请求地址 ???????????fileElementId : ‘file1‘, //文件上传空间的id属性 ?<input type="file" id="file" name="file" /> ???????????type : ‘post‘, ???????????dataType : ‘text‘, //返回值类型 一般设置为json ???????????success : function(data, status) //服务器成功响应处理函数 ???????????{ ???????????????alert("文件上传成功"); ???????????}, ???????????error : function(data, status, e)//服务器响应失败处理函数 ???????????{ ???????????????alert("文件上传失败"); ???????????} ???????}); ???}后台实现：
@RequestMapping(value="/uploadFile.do" ,produces="text/html;charset=utf-8" ) ?????public @ResponseBody String importPicFile1( ??@RequestParam MultipartFile file1,HttpServletRequest request){ ???????????????????????????????Map<String,Object> map= new HashMap<String,Object>(); ????????????????if(file1.isEmpty()){ ?????????????????????map.put( "result", "error"); ?????????????????????map.put( "msg", "上传文件不能为空" ); ???????????????} else{ ?????????????????????String originalFilename=file1.getOriginalFilename(); ?????????????????????String fileBaseName=FilenameUtils.getBaseName(originalFilename); ????????????????????Date now = new Date(); ???????????????????SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); ????????????????????String floderName=fileBaseName+"_" +df.format(now); ??????????????????????try{ ?????????????????????????????//创建要上传的路径 ????????????????????????File fdir = new File("D:/file"); ????????????????????????if (!fdir.exists()) { ?????????????????????????fdir.mkdirs(); ?????????????????????????} ?//文件上传到路径下 ?????????????????????????FileUtils. copyInputStreamToFile(file1.getInputStream(), new File(fdir,originalFilename)); ????????????????????????????//coding ???????????????????????????map.put( "result", "success"); ?????????????????????????????????????????????????} catch (Exception e) { ???????????????????????????map.put( "result", "error"); ???????????????????????????map.put( "msg",e.getMessage()); ?????????????????????????????????????????????????} ???????????????} ?2.文件下载
前台页面：
<table><tr><td>附件</td><td><a href="" id="ssUrl" class="easyui-linkbutton">下载</a></td></tr></table>
JS方法：
$("#ssUrl").attr(‘href‘,"${pageContext.request.contextPath}/bug/download?filename="+fileName) //将后台的路径和文件名赋值给a标签 fileName需要自己从数据库中查出 后台方法：
/** ????* 文件下载 ????* @throws IOException ?????*/ ???@RequestMapping(value="/download",method=RequestMethod.GET) ???public void download(@RequestParam(value="filename")String filename, ???????????HttpServletRequest request, ???????????HttpServletResponse response) throws IOException { ???????//模拟文件，myfile.txt为需要下载的文件 ?????????String path = "D:\\file"+"\\"+filename; ?????????//获取输入流 ?????????InputStream bis = new BufferedInputStream(new FileInputStream(new File(path))); ???????//转码，免得文件名中文乱码 ?????????filename = URLEncoder.encode(filename,"UTF-8"); ?????????//设置文件下载头 ?????????response.addHeader("Content-Disposition", "attachment;filename=" + filename); ???????????//1.设置文件ContentType类型，这样设置，会自动判断下载文件类型 ???????????response.setContentType("multipart/form-data"); ??????????BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream()); ?????????int len = 0; ?????????while((len = bis.read()) != -1){ ?????????????out.write(len); ?????????????out.flush(); ?????????} ?????????out.close(); ?????}本人亲测可用，大家有什么意见可以交流，第一次写博客，如有疏漏，请多多指教！
ssm框架下的文件上传和文件下载
原文地址：https://www.cnblogs.com/noahpk/p/8949862.html