vue+axios+elementUI文件上传与下载
1.文件上传
这里主要介绍一种,elementUI官网 上传组件 http-request 这种属性的使用。
代码如下:
<el-upload class="uploadfile" action="" :http-request='uploadFileMethod' :show-file-list="false" multiple>
<el-button class="custom-btn" size="small">上传</el-button>
</el-upload>
uploadFileMethod方法如下:
uploadFileMethod(param) {
const id = this.currentRowObject.id;
let fileObject = param.file;
let formData = new FormData();
formData.append("file", fileObject);
this.$store
.dispatch("UploadFile", { formData: formData, id: id })
.then(response => {
if (Array.isArray(response)) {
if (response) {
this.$message({
showClose: true,
message: "上传成功。",
type: "success"
});
this.getFileList(id);
}
} else {
this.$message.error(response.message);
}
console.log("response==", response);
})
.catch(message => {
console.log("message======================", message);
this.$message.error("上传失败,请联系管理员");
});
},
这里需要设置header属性
这里是因为封装了axios方法,还使用了vuex。
可将ajax直接替换成axios就好,具体可参见{axios}如下:
axios.post('/upload', formData, { headers: { 'Content-Type': 'multipart/form-data' } })
这里formData就是要向后台传的数据。
2.文件下载
2.1 一种是url式的下载,相当于get请求下载
后台提供一个url。前端a标签href设置上就好。
//带文件名的单个文件下载
@RequestMapping(path = "/downloadwithname/{id}", method = RequestMethod.GET)
public void downloadWithFileName(@PathVariable(name = "id") String strId,
HttpServletResponse response) {
Long id = Utils.stringTransToLong(strId);
//设置Content-Disposition
String fileName = fileService.getFileName(id);
InputStream inputStream = fileService.download(id);
OutputStream outputStream = null;
try {
response.setHeader("Content-Disposition", "attachment;filename="+ URLEncoder.encode(fileName, "UTF-8"));
outputStream = response.getOutputStream();
IOUtils.copy(inputStream, outputStream);
response.flushBuffer();
} catch (IOException e) {
logger.error(e.getMessage(), e);
throw new BizBaseException("server error.");
} finally {
IOUtils.closeQuietly(inputStream);
IOUtils.closeQuietly(outputStream);
}
}
2.2一种是post请求下载 (以流的形式下载文件)
downloadFile() {
const rowId = this.currentRowObject.id;
const rowName = this.currentRowObject.name;
let params = {
ids: this.checkedFileId,
id: rowId
};
this.$store
.dispatch("DownloadFile", params)
.then(res => {
if (res) {
console.log("download===",res);
const content = res.data;
const blob = new Blob([content]);
const fileName = `${rowName}.zip`;
if ("download" in document.createElement("a")) {
// 非IE下载
const elink = document.createElement("a");
elink.download = fileName;
elink.style.display = "none";
elink.href = URL.createObjectURL(blob);
document.body.appendChild(elink);
elink.click();
URL.revokeObjectURL(elink.href); // 释放URL 对象
document.body.removeChild(elink);
} else {
// IE10+下载
navigator.msSaveBlob(blob, fileName);
}
}
})
.catch(() => {
this.$message.error("下载附件失败,请联系管理员");
});
}
总之如下:
axios.post('/download', data, {responseType:'blob' })
后端这里需要设置header:
response.setContentType("application/octet-stream");
// 以流的形式下载文件
try {
InputStream fis = new BufferedInputStream(new FileInputStream(zipFilePath));
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();
response.reset();// 清空response
OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(zipName, "UTF-8"));// 如果输出的是中文名的文件,在此处就要用URLEncoder.encode方法进行处理
toClient.write(buffer);
toClient.flush();
toClient.close();
} catch (IOException ex) {
ex.printStackTrace();
} finally {
//删除临时压缩文件
try {
File f = new File(zipFilePath);
f.delete();
} catch (Exception e) {
e.printStackTrace();
}
}
就先简单介绍这里,如有问题可以留言讨论学习。