使用FormData上傳多個檔案
阿新 • • 發佈:2019-01-30
由於專案中使用到,特此寫個Demo
html程式碼:
<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程式碼:
<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();
//上傳檔案
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();
//迴圈新增到formData中
fileList.forEach(function (file) {
formData.append('files', file, file.name);
})
request.open("POST", "/test/upload.do");
request.send(formData);
}
})
</script>
後端使用Spring MVC接收前端檔案
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";
}
前端頁面:
請求: