转：Spring Boot上传文件（带进度条） - 为你撑起一片天 - 博客园 (cnblogs.com)
配置文件
spring: freemarker: template-loader-path: classpath:/static/ ##Spring Boot 2.x 配置上传文件大小 servlet: multipart: max-file-size: 500MB max-request-size: 500MB InfoMsg Bean##
public class InfoMsg { private String code; private String msg; public String getCode() { return code; } public void setCode(String code) { this.code = code; } public String getMsg() { return msg; } public void setMsg(String msg) { this.msg = msg; } } Controller##
@Controller @RequestMapping("/upload") public class UploadController { private static final String TMP_PATH = "D:/projects/tmp"; @GetMapping public String fileUp() { return "upload"; } @ResponseBody @PostMapping public InfoMsg fileUpload(@RequestParam("uploadFile") MultipartFile file) { InfoMsg infoMsg = new InfoMsg(); if (file.isEmpty()) { infoMsg.setCode("error"); infoMsg.setMsg("Please select a file to upload"); return infoMsg; } try { File tmp = new File(TMP_PATH, file.getOriginalFilename()); if (!tmp.getParentFile().exists()) { tmp.getParentFile().mkdirs(); } String[] fileInfo = getFileInfo(tmp); File orRenameFile = createOrRenameFile(tmp, fileInfo[0], fileInfo[1]); if (tmp.renameTo(orRenameFile)) { file.transferTo(orRenameFile); }else { file.transferTo(tmp); } infoMsg.setCode("success"); infoMsg.setMsg("You successfully upload" + file.getOriginalFilename()); } catch (IOException e) { infoMsg.setCode("error"); infoMsg.setMsg("Uploaded file failed"); } return infoMsg; } /** * 创建或重命名文件 * ps：sss.jpg sss(1).jpg * @param from * @param toPrefix * @param toSuffix * @return */ public static File createOrRenameFile(File from, String toPrefix, String toSuffix) { File directory = from.getParentFile(); if (!directory.exists()) { if (directory.mkdir()) { System.out.println("Created directory " + directory.getAbsolutePath()); } } File newFile = new File(directory, toPrefix + toSuffix); for (int i = 1; newFile.exists() && i < Integer.MAX_VALUE; i++) { newFile = new File(directory, toPrefix + "(" + i + ")" + toSuffix); } if (!from.renameTo(newFile)) { System.out.println("Couldn't rename file to " + newFile.getAbsolutePath()); return from; } return newFile; } /** * 获取File的 . 前后字串 * @param from * @return */ public static String[] getFileInfo(File from) { String fileName = from.getName(); int index = fileName.lastIndexOf("."); String toPrefix = ""; String toSuffix = ""; if (index == -1) { toPrefix = fileName; } else { toPrefix = fileName.substring(0, index); toSuffix = fileName.substring(index, fileName.length()); } return new String[]{toPrefix, toSuffix}; } } 页面upload.ftl 使用的是freemarker##
<!DOCTYPE html> <html> <head> <style type="text/css"> progress { background-color: #56BE64; } progress::-webkit-progress-bar { background: #ccc; } progress::-webkit-progress-value { background: #56BE64; } percentage { position: fixed; left: 160px; } </style> <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script> </head> <body> <h1>Spring Boot file upload example</h1> <form id="FileuploadForm" method="POST" action="/upload" enctype="multipart/form-data"> <input type="file" name="uploadFile" id="uploadFile"/><br/> <br/> <input type="button" id="btnUpload" value="上传文件" onclick="upload()"/> <div id="msg"></div> </form> <!--进度条部分(默认隐藏)--> <div style="display: none;" class="progress-body"> <div> <span style="width: 100px; display: inline-block; text-align: right">上传进度：</span> <progress></progress> <percentage>0%</percentage> </div> <div> <span style="width: 100px; display: inline-block; text-align: right">上传速度：</span> <span style="width: 300px;" class="progress-speed">0 M/S, 0/0M</span> </div> <div> <span style="width: 100px; display: inline-block; text-align: right">上传状态：</span> <span style="width: 300px;" class="progress-info">请选择文件并点击上传文件按钮</span> </div> </div> <script> // 上传文件 function upload() { $("#msg").text(""); var checkFile = $("#uploadFile").val(); var msgInfo = ""; if (null == checkFile || "" == checkFile) { $("#msg").text("文件为空,请选择文件!"); } else { var formData = new FormData(document.getElementById("FileuploadForm")); $.ajax({ type: "POST", enctype: 'multipart/form-data', url: '/upload', data: formData, cache: false, processData: false, contentType: false, error: function (result) { console.log("error"); console.log(result); flag = false; $("#msg").text("访问服务器错误，请重试！"); }, success: function (result) { console.log("success"); }, xhr: function () { var xhr = $.ajaxSettings.xhr(); if (xhr.upload) { $("#btnUpload").attr("disabled", true); $("#uploadFile").attr("disabled", true); //处理进度条的事件 xhr.upload.addEventListener("progress", progressHandle, false); //加载完成的事件 xhr.addEventListener("load", completeHandle, false); //加载出错的事件 xhr.addEventListener("error", failedHandle, false); //加载取消的事件 xhr.addEventListener("abort", canceledHandle, false); //开始显示进度条 showProgress(); return xhr; } } }, 'json'); } } var start = 0; //显示进度条的函数 function showProgress() { start = new Date().getTime(); $(".progress-body").css(