公司的项目很多地方要用到文件上传，以前的上传主要是用apache的fileupload ,使用的感受并不太好。今天试了试spring的MultipartFile，感觉还不错，封装的比较简洁。
当然，中间也排除了不少坑。
1. 配置CommonsMultipartResolver
1 ????<!-- 配置MultipartResolver 用于文件上传 使用spring的CommosMultipartResolver -->2 ????<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">3 ????????<property name="defaultEncoding" value="UTF-8"/>4 ????????<property name="maxUploadSize" value="209715200"/>5 ????????<property name="maxInMemorySize" value="4096"/>6 ????????<property name="uploadTempDir" value="fileUpload/temp"/>7 ????</bean>
defaultEncoding="UTF-8" 是请求的编码格式，默认为iso-8859-1
maxUploadSize="209715200" 是上传文件的总的大小，单位为字节，我设置的是200M,
uploadTempDir="fileUpload/temp" 为上传文件的临时路径
2. 添加apache的 fileupload
1 <dependency>2 ????<groupId>commons-fileupload</groupId>3 ????<artifactId>commons-fileupload</artifactId>4 ????<version>1.2.2</version>5 </dependency>
应该是multipartfile方式上传底层也会用到commons-fileupload
3.前端用了jquery file upload
1 <span class="btn btn-success fileinput-button"> 2 ????<i class="glyphicon glyphicon-plus"></i> 3 ????<span>选择文件...</span> 4 ????<!-- The file input field used as target for the file upload widget --> 5 ????<input id="fileupload" type="file" name="file[]" multiple> 6 </span> 7 #jquery file upload 没有采用form表单上传，是ajax方式向后台发送的请求，
??#如果是以表单形式提交上传请求，不要忘了加上enctype="multipart/form-data"
8 ... 9 10 $(‘#fileupload‘).fileupload({11 ????url: "<%=request.getContextPath()%>/aaa/upload.do",12 ????sequentialUploads: true,13 ????singleFileUploads: false,14 ????add: function (e, data) {15 ????????data.context = $(‘<button/>‘).text(‘Upload‘)16 ????????????.appendTo(document.body)17 ????????????.click(function () {18 ????????????????data.context = $(‘<p/>‘).text(‘Uploading...‘).replaceAll($(this));19 ????????????????data.submit();20 ????????????});21 ????},22 ????done: function (e, data) {23 ????????$.each(data.files, function (index, file) {24 ????????????$(‘<p/>‘).text(file.name).appendTo(document.body);25 ????????});26 ????}27 });
jquery file upload 看起来还不错，就是中文的资料还是有点少，官网看的头大。
4.后台是我们的重点，其实我想说，我本来只是想周末找一个好用，好看的前端上传插件的，结果重点弄到后台来了。。
由于配置了CommonsMultipartResolver，文件上传请求HttpServletRequest会被解析为MultipartHttpServletRequest
1 ?/** 2 ?????* 多文件上传 3 ?????* 4 ?????* @param multipartRequest 5 ?????* @return 6 ?????* @throws IOException 7 ?????*/ 8 ????@ResponseBody 9 ????@RequestMapping(value = "upload", method = RequestMethod.POST)10 ????public String handleImport(DefaultMultipartHttpServletRequest multipartRequest) throws IOException {11 ????????if (multipartRequest != null) {12 ????????????Iterator<String> iterator = multipartRequest.getFileNames();13 ????????????while (iterator.hasNext()) {14 15 // ???????????????//单文件上传 。16 // ???????????????MultipartFile file = multipartRequest.getFile(iterator.next());//一次传一个文件17 // ???????????????if (StringUtils.hasText(file.getOriginalFilename())) {18 // ???????????????????file.transferTo(new File("E:/upload_" + file.getOriginalFilename()));19 // ???????????????}20 21 ????????????????//多文件上传22 ????????????????List<MultipartFile> fileList = multipartRequest.getFiles(iterator.next()); //一次选多个文件上传23 ????????????????for (MultipartFile file : fileList) {24 ????????????????????if (StringUtils.hasText(file.getOriginalFilename())) {25 ????????????????????????file.transferTo(new File("E:/upload_" + file.getOriginalFilename()));26 ????????????????????}27 ????????????????}28 ????????????}29 ????????}30 ????????return "success";31 ????}MultipartFile 多文件上传的应用
原文地址：http://www.cnblogs.com/tibit/p/7819893.html