一、项目背景

技术：vue+Arco Design+java

介绍：页面上传mapShow.zip压缩包，只允许上传压缩包，且上传有格式校验，然后文件大小在600M或者上G的压缩包，像这种上传是不可能直接一整个包上传的，浏览器也不支持，同时这样做也不友好。

解决方案：采用分片技术，即把一个打压缩包切割成每个10M大小的分片，然后上传到指定目录下，最后再把所有分片文件进行合并成mapShow.zip压缩包，最后再解压mapShow.zip文件到指定目录下即可。

二、页面

三、代码

1.前端

java"><div class="param"><a-spin style="width: 70%"><div class="param-title"><div class="param-title-text">{{ $t("OfflineMapPathSetting") }}:</div></div><div class="param-content"><divclass="parent"style="display: flex; align-items: center; gap: 20px"><div><span class="label">{{ $t("Import") }}:</span></div><a-input class="div" v-model="fileName" disabled /><a-upload@change="onChange":auto-upload="false":show-file-list="false"><template #upload-button><svg-loaderclass="frameIcon"name="import-file"></svg-loader></template></a-upload></div></div></a-spin>
</div>const onChange = async (fileList) => {files.value = [];const lastUploadedFile = fileList[fileList.length - 1];fileName.value = lastUploadedFile.name;const allowedExtensions = /(.zip)$/i;if (!allowedExtensions.exec(lastUploadedFile.name)) {Message.error(t("invalidCerFileType2"));return;}uploadeLoading.value = true;if (fileList.length > 0) {const lastUploadedFile = fileList[fileList.length - 1];const chunkSize = 10 * 1024 * 1024;const totalChunks = Math.ceil(lastUploadedFile.file.size / chunkSize);for (let chunkIndex = 0; chunkIndex < totalChunks; chunkIndex++) {const start = chunkIndex * chunkSize;const end = Math.min(start + chunkSize, lastUploadedFile.file.size);const chunk = lastUploadedFile.file.slice(start, end);const formData = new FormData();formData.append("file", chunk);formData.append("fileId", "mapShow");formData.append("chunkIndex", chunkIndex);formData.append("totalChunks", totalChunks);await importOfflineMapFunction(formData);}progress.value = 100;uploadeLoading.value = false;Message.success(t("LoadMap"));}
};const importOfflineMapFunction = async (formData) => {await importOfflineMap(formData).then((response) => {commonResponse({response,onSuccess: () => {},});});
};

2.mock-i18n.js文件

java">"invalidCerFileType2": "无效的文件类型，文件后缀必须是.zip等格式"

3.xx.js文件定义方法

java">export const importOfflineMap = (data) => {return $http({url: `/api/systemParam/importOfflineMap`,method: Method.POST,headers: {'Content-Type': 'multipart/form-data','X-Requested-With': 'XMLHttpRequest'},data,timeout: 300000})
}

4.配置文件 application.properties

java">spring.servlet.multipart.max-file-size=600MB
spring.servlet.multipart.max-request-size=2GB

5.后端方法

java">private static String OFFLINE_MAP_TEMPORARY_PATH = "\\..\\temporary\\";
private static String OFFLINE_MAP_TARGET_PATH = "\\..\\nginx\\html\\mapShow\\";@Operation(summary = "导入离线地图")
@PostMapping(value = "/importOfflineMap")
public ResponseModel importOfflineMap(@RequestParam("file") MultipartFile file,@RequestParam("fileId") String fileId,@RequestParam("chunkIndex") int chunkIndex,@RequestParam("totalChunks") int totalChunks) {return systemParamUserControl.importOfflineMap(file, fileId, chunkIndex, totalChunks);
}public ResponseModel importOfflineMap(MultipartFile file, String fileId, int chunkIndex, int totalChunks) {try {String userDir = System.getProperty("user.dir");logger.info("importOfflineMap-user.dir:{}", userDir);String offlineMapTemporaryPath = userDir + OFFLINE_MAP_TEMPORARY_PATH;File uploadFile = new File(offlineMapTemporaryPath);if (!uploadFile.exists()) {uploadFile.mkdirs();}String chunkFileName = offlineMapTemporaryPath + fileId + ".part" + chunkIndex;file.transferTo(new File(chunkFileName));if (chunkIndex == totalChunks - 1) {String offlineMapTargetPath = userDir + OFFLINE_MAP_TARGET_PATH;mergeFile(fileId, totalChunks, offlineMapTemporaryPath, offlineMapTargetPath);}} catch (IOException e) {logger.error("importOfflineMap-IOException:{}", e);}return ResponseModel.ofSuccess();}private void mergeFile(String fileId, int totalChunks, String offlineMapTemporaryPath, String offlineMapTargetPath) {// 创建最终文件File outputFile = new File(offlineMapTemporaryPath + fileId + ".zip");try {FileOutputStream fos = new FileOutputStream(outputFile);for (int i = 0; i < totalChunks; i++) {Path chunkPath = Paths.get(offlineMapTemporaryPath + fileId + ".part" + i);Files.copy(chunkPath, fos);Files.delete(chunkPath);}unzip(outputFile, offlineMapTargetPath);} catch (Exception e) {logger.error("mergeFile-Exception:{}", e);}}private void unzip(File zipFile, String destDir) throws IOException {byte[] buffer = new byte[1024];try (ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFile))) {ZipEntry zipEntry = zis.getNextEntry();while (zipEntry != null) {File newFile = new File(destDir, zipEntry.getName());if (zipEntry.isDirectory()) {newFile.mkdirs();} else {// Create directories for nested filesnew File(newFile.getParent()).mkdirs();try (FileOutputStream fos = new FileOutputStream(newFile)) {int len;while ((len = zis.read(buffer)) > 0) {fos.write(buffer, 0, len);}}}zipEntry = zis.getNextEntry();}zis.closeEntry();}zipFile.delete();}

四、易错点

易错点1：前端要进行分片切割，然后再分片上传。

易错点2：后端配置文件要配置。

后端配置文件要配置，不然默认浏览器只支持5M或者1M，当上传10M分片文件时会报错，无法调通接口，执行流程就卡在前端了，压根调不通后端上传接口。

java">spring.servlet.multipart.max-file-size=600MB
spring.servlet.multipart.max-request-size=2GB

易错点3：个人感觉最好分片大小别太大。

易错点4：上传途中最好加个“遮罩”或者进度条，比如显示“正在上传中…”会更友好。

易错点5：如果项目采用nginx，记得修改nginx.conf。

如果项目采用nginx，记得修改nginx.conf，配置上传切片大小、超时时间等等参数设置，否则也会上传失败。

五、补充点

网上还有网友说道使用什么“断点续传”的功能，这个我目前未验证，不清楚如何，其他博主可自行验证然后分享结论看是否可行。