FormData上传多个文件 使用FormData实现上传多个文件
半笙彷徨 人气:0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：
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