我想使用axios
下载pdf文件,并使用fs.writeFile
保存在磁盘(服务器端)上,我已经尝试过:
axios.get('https://xxx/my.pdf', {responseType: 'blob'}).then(response => {
fs.writeFile('/temp/my.pdf', response.data, (err) => {
if (err) throw err;
console.log('The file has been saved!');
});
});
文件已保存,但内容已损坏...
如何正确保存文件?
最佳答案
实际上,我相信以前接受的答案存在一些缺陷,因为它不能正确处理写流,因此,如果在Axios给您响应后调用“then()”,最终将得到部分下载的文件。
当下载稍大的文件时,这是一个更合适的解决方案:
export async function downloadFile(fileUrl: string, outputLocationPath: string) {
const writer = createWriteStream(outputLocationPath);
return Axios({
method: 'get',
url: fileUrl,
responseType: 'stream',
}).then(response => {
//ensure that the user can call `then()` only when the file has
//been downloaded entirely.
return new Promise((resolve, reject) => {
response.data.pipe(writer);
let error = null;
writer.on('error', err => {
error = err;
writer.close();
reject(err);
});
writer.on('close', () => {
if (!error) {
resolve(true);
}
//no need to call the reject here, as it will have been called in the
//'error' stream;
});
});
});
}
这样,您可以调用downloadFile()
,对返回的promise调用then()
,并确保下载的文件已完成处理。