[英]How to upload image with react native?
我用這樣的 react js 上傳圖像:
const onSubmit = (e) => {
console.log(e.img);
form.append("file", e.img.originFileObj);
Axios.post("url", form, {
headers: {
Authorization: `bearer ${localStorage.getItem("token")}`,
},
})
};
e.img 的控制台日志是:
現在在 react native 我使用包react-native-image-crop-picker
。
在我設置圖像文件后,它會給出一個這樣的對象:
{"cropRect": {"height": 960, "width": 960, "x": 0, "y": 160}, "height": 400, "mime": "image/jpeg", "modificationDate": "1636923018000", "path": "file:///storage/emulated/0/Android/data/com.myapp/files/Pictures/33fc6a3f-3673-4756-8343-6f6bcb3c1a7b.jpg", "size": 89454, "width": 400}
現在,當我嘗試上傳圖像時,它會給出有關 img 文件的錯誤。
后端是節點 js,我使用 multer 處理圖像文件,如下所示:
const multer = require('multer');
const uuid = require('uuid');
const MIME_TYPE_MAP = {
'image/png': 'png',
'image/jpeg': 'jpeg',
'image/jpg': 'jpg'
};
const fileUpload = multer({
limits: 20000000000,
storage: multer.diskStorage({
destination: (req, file, cb) => {
cb(null, 'upload/img');
},
filename: (req, file, cb) => {
const ext = MIME_TYPE_MAP[file.mimetype];
cb(null, uuid.v4() + '.' + ext);
}
}),
fileFilter: (req, file, cb) => {
const isValid = !!MIME_TYPE_MAP[file.mimetype];
let error = isValid ? null : new Error('Invalid mime type!');
cb(error, isValid);
}
});
module.exports = fileUpload;
如何像在 react js 中那樣在 react native 中發布圖像文件?
像 reactjs 一樣,在這里你可以使用 FormData 並像這樣附加文件:
asycn function uploadImage() {
const formData = new FormData();
const imageData = {
uri: cropImageData.path, // file uri/path
name: 'MyImage.jpg', //file name
type: cropImageData.mime, //file type
}
formData.append("file", imageData);
await fetch(url, {
method: "POST",
headers: {
'Content-Type': 'multipart/form-data',
Authorization: token,
},
data: formData,
}).then((response), {
console.log(response)
}).catch((error) => console.log(response));
}
或者您可以從數據中發送 base64 字符串,(您可以從裁剪圖像選擇器中獲取 base64)
asycn function uploadImage() {
await fetch(url, {
method: "POST",
headers: {
'Content-Type': 'application/json',
Authorization: token,
},
data: JSON.stringify({
file: imageBase64String,
}),
}).then((response), {
console.log(response)
}).catch((error) => console.log(response));
}
在這里,您也可以使用 axios 而不是 fetch。
我這樣解決了這個問題
ImagePicker.openPicker({
width: 400,
height: 400,
cropping: true,
includeBase64: true,
})
.then(image => {
setImg(image);
})
.then(() => setModalVisible(prev => !prev));
const nn = JSON.stringify(img.path).substring(
JSON.stringify(img.path).lastIndexOf('/') + 1,
);
const image = {
name: nn,
uri: img.path,
type: img.mime,
size: img.size,
lastModifiedDate: JSON.parse(img.modificationDate),
uid: img.modificationDate,
};
const form = new FormData();
form.append('file', image);
axios
.post('url', form, {
headers: {
Authorization: `bearer ${JSON.parse(token)}`,
},
})
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