SpringMVC前臺利用ajax和FormData上傳檔案
阿新 • • 發佈:2019-01-24
前臺的頁面結構及js邏輯
1、 html結構:
<%--此處必須是multipart/form-data--%>
<form method="post" enctype="multipart/form-data" id="upload">
<input type="file" name="file" class="uploadfile" id="file">
<p><input type="button" value="上傳" class="addbtn"></p>
</form>
2、ajax內容(此處運用jquery):
$(".addbtn").click(function () {
//獲取input:type='file'選中檔案的內容
var file = $("#file")[0].files[0];
if ($("#file").val() == "") {
alert("請選擇上傳檔案");
} else {
var formData = new FormData();
//此處將所要傳遞的資料append到formData中
formData.append("fileinfo", file);
$.ajax({
url: "/uploadFile",
type: "POST",
data: formData,
processData: false, //必不可缺
contentType: false, //必不可缺
success: function (e) {
alert("檔案上傳成功");
$("#file").val() == "";
}
})
}
});
後臺的頁面結構及js邏輯
1、pom.xml中的配置(在maven中下載所需要的包)
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.3</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.0</version>
<scope>provided</scope>
</dependency>
2、SpringMVC的Controller中的內容
// 上傳檔案
@ResponseBody
@RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
public void uploadFile(@RequestParam(value = "fileinfo", required = false) MultipartFile file, HttpServletRequest request, HttpServletResponse response) {
//上傳檔案的路徑
String path = FileTools.getFileInfo(request, response, file);
}
3、工具類裡面的內容
// 自定義上傳檔案儲存目錄
private static final String UPLOAD_DIRECTORY = "upload";
//MultipartFile上傳檔案
public static String getFileInfo(HttpServletRequest request, HttpServletResponse response, MultipartFile file) {
String filePath = new String();
String uploadPath = request.getSession().getServletContext().getRealPath("./") + UPLOAD_DIRECTORY;
// 如果目錄不存在則建立
File uploadDir = new File(uploadPath);
if (!uploadDir.exists()) {
uploadDir.mkdir();
}
//判斷檔案是否為空
if (!file.isEmpty()) {
try {
//檔案的儲存路徑
filePath = request.getSession().getServletContext().getRealPath("/") + UPLOAD_DIRECTORY + File.separator + file.getOriginalFilename();
//轉存檔案
file.transferTo(new File(filePath));
} catch (Exception e) {
e.printStackTrace();
}
}
return filePath;
}//函式結束符
此文章僅限自己的筆記而已,其中有些術語可能不太準確,只供參考,如有問題歡迎賜教!