java 实现多个文件同时上传

要实现Java中的多文件同时上传，可以使用Java Servlet技术和Apache Commons FileUpload库。下面是一个简单的示例：
1、在HTML表单中使用input标签中的multiple属性允许用户选择多个文件

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<form action="upload" method="post" id="addMore" enctype="multipart/form-data">   <input type="file" name="file" id="file" onchange="uploadFilesLoad()" multiple>   <input type="submit" value="Upload"> </form>

2、js处理

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// 选中上传文件处理 function uploadFilesLoad() {     var files = document.getElementById("file").files;     for(var i = 0; i < files.length; i++) {         // 文件处理         // ...     } }   // 上传文件 function upload() {     // 上传请求url     var uploadUrl = "/.../uploadFile";     $("#addMore").ajaxSubmit({             type: "post",             url: uploadUrl,             dataType: "json",             //headers: {Auth:TOKEN},             beforeSubmit: function (formData) {                 // 上传前数据处理 formData为form所有数据                 // ...             },             success: function (resp) {                 // 上传成功处理                 // ...             },             error: function (code, error) {                 // 上传失败处理                 // ...             }         }); }

3、后台处理

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import org.springframework.web.multipart.MultipartHttpServletRequest;   @PostMapping(value = "/uploadFile") public void uploadFile(HttpServletRequest request) {     MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) request;     List<MultipartFile> fileList = mRequest.getFiles("file");     for (MultipartFile upfile : fileList) {             // 文件大小             String fileSize = new BigDecimal(upfile.getSize()).divide(new BigDecimal(1024), 0, BigDecimal.ROUND_HALF_UP).toPlainString();             String originalFilename = upfile.getOriginalFilename();             // 解决IE兼容问题             originalFilename = originalFilename.substring(originalFilename.lastIndexOf("\\") + 1);             // 文件名             String fileName = originalFilename.substring(0, originalFilename.lastIndexOf("."));             // 文件类型             String fileType = originalFilename.substring(originalFilename.lastIndexOf("."));             // 文件上传路径             String path = "";             String filePath = path + File.separator + originalFilename;             File pathFile = new File(filePath);             // 文件夹是否存在             if (pathFile.exists()) {                 // 若不存在，创建                 if (!pathFile.mkdirs()) {                     return false;                 }             }             // 上传文件             /*FileOutputStream outputStream = new FileOutputStream(pathFile);             fos.write(mFile.getBytes());             fos.close();*/         } }