前端代码：
<form id= "uploadForm">
<p >指定文件名： <input type="text" name="filename" value= ""/></p >
<p >上传文件： <input type="file" name="file"/></ p>
<input type="button" value="上传" onclick="doUpload()" />
</form> function doUpload() {
var formData = new FormData($( "#uploadForm" )[0]);
$.ajax({
url: 'http://localhost:8080/xiaochangwei/file/upload' ,
type: 'POST',
data: formData,
async: false,
cache: false,
contentType: false,
processData: false,
success: function (returndata) {
alert(returndata);
},
error: function (returndata) {
alert(returndata);
}
});
}
后端：
@RequestMapping(value = "/upload", method = RequestMethod.POST)
public String upload(HttpServletRequest request, @RequestParam("file") MultipartFile file, ModelMap model) {
System.out.println("开始");
String path = request.getSession().getServletContext().getRealPath("upload");
String fileName = file.getOriginalFilename();
// String fileName = new Date().getTime()+".jpg";
System.out.println(path);
File targetFile = new File(path, fileName);
if (!targetFile.exists()) {
targetFile.mkdirs();
} // 保存
try {
file.transferTo(targetFile);
} catch (Exception e) {
e.printStackTrace();
}
model.addAttribute("fileUrl", request.getContextPath() + "/upload/" + fileName);
return "result";
}
如果前端有很多实体类数据同文件一同提交
可以修改后端方法为：
upload(HttpServletRequest request, @RequestParam("file") MultipartFile file, ModelMap model,User user)
利用下面的代码更可实现带有进度条的文件上传
<script type="text/javascript">
function UpladFile() {
var fileObj = document.getElementById("file").files[0]; // js 获取文件对象
var FileController = "http://localhost:8080/xiaochangwei/file/upload"; // 接收上传文件的后台地址
// FormData 对象
var form = new FormData($( "#uploadForm" )[0]);
// XMLHttpRequest 对象
var xhr = new XMLHttpRequest();
xhr.open("post", FileController, true);
xhr.onload = function () {
// alert("上传完成!");
};
xhr.upload.addEventListener("progress", progressFunction, false);
xhr.send(form);
}
function progressFunction(evt) {
var progressBar = document.getElementById("progressBar");
var percentageDiv = document.getElementById("percentage");
if (evt.lengthComputable) {
progressBar.max = evt.total;
progressBar.value = evt.loaded;
percentageDiv.innerHTML = Math.round(evt.loaded / evt.total * 100) + "%";
if(evt.loaded==evt.total){
alert("上传完成100%");
}
}
}
</script>
<br />
<br />
<br />
<br />
<progress id="progressBar" value="0" max="100"></progress>
<span id="percentage"></span>
<br />
<br />
<br />
<br />
<form id= "uploadForm">
<input type="file" id="file" name="myfile" />
<input type="button" onclick="UpladFile()" value="上传" /> </form>