45 lines
1.6 KiB
Markdown
45 lines
1.6 KiB
Markdown
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# 参考
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- https://blog.csdn.net/clearlxj/article/details/108264141
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>查看源码发现axios返回的内容默认是Stream格式的；
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如果没有设置responseType的话，返回内容将会从Stream转为Buffer再转为String；
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如果responseType为stream的话不进行转换；
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如果responseType为arraybuffer的话将Stream转为Buffer；
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但是如果想把Buffer转为String再转回Buffer的话将会出问题(默认使用utf8进行Buffer的编码和解码)，有的文件这样是可以的，但是Excel文件这样做的话两次Buffer的值是不同的；但是转为base64的话是都可以的。
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# 设置responseType为stream
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```js
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const result = await require('axios')({ url, method, data, responseType: 'stream' });
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result.data.pipe(require('fs').createWriteStream(saveFilePath));
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```
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提供buffer转Stream并保存为文件的方法
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```js
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function bufferToStream(bufferData, saveFilePath) {
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return new Promise((res, rej) => {
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const bufferStream = new stream.PassThrough();
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bufferStream.end(bufferData);
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const ws = fs.createWriteStream(saveFilePath);
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bufferStream.pipe(ws).on('finish', () => {
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res(saveFilePath);
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});
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});
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}
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```
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# 设置responseType为arraybuffer
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```js
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const result = await require('axios')({ url, method, data, responseType: 'arraybuffer' });
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const bufferData = result.data;
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await bufferToStream(bufferData, saveFilePath);
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```
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# 不设置responseType，设置responseEncoding为base64
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```js
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const result = await require('axios')({ url, method, data, responseEncoding: 'base64' });
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const bufferData = Buffer.from(result.data, 'base64');
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await bufferToStream(bufferData, saveFilePath);
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```
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