文章目录
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
<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">
<div
class="parent"
style="display: flex; align-items: center; gap: 20px"
>
<div>
<span class="label">{{ $t("Import") }}:</span>
</div>
<a-input class="div" v-model="fileName" disabled />
<a-upload
@change="onChange"
:auto-upload="false"
:show-file-list="false"
>
<template #upload-button>
<svg-loader
class="frameIcon"
name="import-file"
></svg-loader>
</template>
</a-upload>
</div>
</div>
</a-spin>
</div>
const onChange = async (fileList) => {
files.value = [];
const lastUploadedFile = fileList[fileList.length - 1];
fileName.value = lastUploadedFile.name;
const allowedExtensions = /(.zip)$/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
"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
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
spring.servlet.multipart.max-file-size=600MB
spring.servlet.multipart.max-request-size=2GB
5.后端方法
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 files
new 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。
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。