使用FormData上传多个文件

首先给大家推荐一下我老师大神的人工智能教学网站。教学不仅零基础,通俗易懂,而且非常风趣幽默,还时不时有内涵黄段子!点这里可以跳转到网站

由于项目中使用到,特此写个Demo
html代码:

<html>
<head>
    <title>Title</title>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
</head>
<body>
<form enctype="multipart/form-data" id="form_example">
    <input type="file" id="files" multiple/><br/><br/>
    <input type="submit" value="提交"/>
</form>

<div id='file-list-display'></div>
</body>
</html>

js代码:

<script type="text/javascript">
    $(document).ready(function () {
        var fileList = [];
        var fileCatcher = document.getElementById('form_example');
        var files = document.getElementById("files"), renderFileList;
        var fileListDisplay = document.getElementById('file-list-display'), sendFile;

        fileCatcher.addEventListener("submit", function (event) {
            event.preventDefault();
            //上传文件
            sendFile();
        });

        files.addEventListener("change", function (event) {
            for (var i = 0; i < files.files.length; i++) {
                fileList.push(files.files[i]);
            }
            renderFileList();
        });

        renderFileList = function () {
            fileListDisplay.innerHTML = '';
            fileList.forEach(function (file, index) {
                var fileDisplayEl = document.createElement("p");
                fileDisplayEl.innerHTML = (index + 1) + ":" + file.name;
                fileListDisplay.appendChild(fileDisplayEl);
            })
        };

        sendFile = function () {
            var formData = new FormData();
            var request = new XMLHttpRequest();
            //循环添加到formData中
            fileList.forEach(function (file) {
                formData.append('files', file, file.name);
            })
            request.open("POST", "/test/upload.do");
            request.send(formData);
        }
    })
</script>

后端使用Spring MVC接收前端文件
配置multipart解析器:

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"
          p:defaultEncoding="utf-8"/>

Controller:

@RequestMapping("/upload.do")
@ResponseBody
public Object upload(@RequestParam MultipartFile[] files) {
      System.out.println(files.length);
      return "ok";
}

前端页面:

请求:

点这里可以跳转到人工智能网站

发表评论