本文内容：
react-native-fs的简单使用
- 下载文件(图片、文件、视频、音频)
- 将文本写入本地 txt
- 读取txt文件内容
- 在已有的txt上添加新的文本
- 删除文件
- 上传文件 only iOS
github链接: https://github.com/itinance/react-native-fs
另外还有一个下载的库 ：https://github.com/wkh237/react-native-fetch-blob
安装步骤
第一步：
npm install react-native-fs --save
第二步：
react-native link react-native-fs
OK 即可开始使用(不放心的可以按照github上的对比一下)
简单使用
import RNFS from 'react-native-fs';
下载文件
/*下载文件*/ downloadFile() {
// On Android, use "RNFS.DocumentDirectoryPath" (MainBundlePath is not defined) // 图片 // const downloadDest = `${
RNFS.MainBundlePath}
/${
((Math.random() * 1000) | 0)}
.jpg`;
// const formUrl = 'http://img.kaiyanapp.com/c7b46c492261a7c19fa880802afe93b3.png?imageMogr2/quality/60/format/jpg';
// 文件 // const downloadDest = `${
RNFS.MainBundlePath}
/${
((Math.random() * 1000) | 0)}
.zip`;
// const formUrl = 'http://files.cnblogs.com/zhuqil/UIWebViewDemo.zip';
// 视频 // const downloadDest = `${
RNFS.MainBundlePath}
/${
((Math.random() * 1000) | 0)}
.mp4`;
// http://gslb.miaopai.com/stream/SnY~bbkqbi2uLEBMXHxGqnNKqyiG9ub8.mp4?vend=miaopai& // https://gslb.miaopai.com/stream/BNaEYOL-tEwSrAiYBnPDR03dDlFavoWD.mp4?vend=miaopai& // const formUrl = 'https://gslb.miaopai.com/stream/9Q5ADAp2v5NHtQIeQT7t461VkNPxvC2T.mp4?vend=miaopai&';
// 音频 const downloadDest = `${
RNFS.MainBundlePath}
/${
((Math.random() * 1000) | 0)}
.mp3`;
// http://wvoice.spriteapp.cn/voice/2015/0902/55e6fc6e4f7b9.mp3 const formUrl = 'http://wvoice.spriteapp.cn/voice/2015/0818/55d2248309b09.mp3';
const options = {
fromUrl: formUrl, toFile: downloadDest, background: true, begin: (res) => {
console.log('begin', res);
console.log('contentLength:', res.contentLength / 1024 / 1024, 'M');
}
, progress: (res) => {
let pro = res.bytesWritten / res.contentLength;
this.setState({
progressNum: pro, }
);
}
}
;
try {
const ret = RNFS.downloadFile(options);
ret.promise.then(res => {
console.log('success', res);
console.log('file://' + downloadDest) }
).catch(err => {
console.log('err', err);
}
);
}
catch (e) {
console.log(error);
}
}
将文本写入本地 txt
/*将文本写入本地 txt*/ writeFile() {
// create a path you want to write to const path = RNFS.MainBundlePath + '/test.txt';
// write the file RNFS.writeFile(path, '这是一段文本，YES', 'utf8') .then((success) => {
console.log('path', path);
}
) .catch((err) => {
console.log(err.message);
}
);
}
读取txt文件内容
/*读取txt文件内容*/ readFile() {
// create a path you want to delete const path = RNFS.MainBundlePath + '/test.txt';
return RNFS.readFile(path) .then((result) => {
console.log(result);
this.setState({
readTxtResult: result, }
) }
) .catch((err) => {
console.log(err.message);
}
);
}
在已有的txt上添加新的文本
/*在已有的txt上添加新的文本*/ appendFile() {
const path = RNFS.MainBundlePath + '/test.txt';
return RNFS.appendFile(path, '新添加的文本', 'utf8') .then((success) => {
console.log('success');
}
) .catch((err) => {
console.log(err.message);
}
);
}
删除文件
/*删除文件*/ deleteFile() {
// create a path you want to delete const path = RNFS.MainBundlePath + '/test.txt';
return RNFS.unlink(path) .then(() => {
console.log('FILE DELETED');
}
) // `unlink` will throw an error, if the item to unlink does not exist .catch((err) => {
console.log(err.message);
}
);
}
上传文件 only iOS
/*上传文件 only iOS*/ uploadFile() {
const uploadSrc = `${
RNFS.MainBundlePath}
/test.txt`;
const uploadUrl = 'http://buz.co/rnfs/upload-tester.php';
const options = {
toUrl: uploadUrl, files: [{
name: 'myfile', filename: 'test.txt', filepath: uploadSrc, filetype: 'text/plain'}
], background: true, method: 'POST', // PUT begin: (res) => {
console.log('begin', res);
}
, progress: (res) => {
console.log('progress', res);
}
}
;
const ret = RNFS.uploadFiles(options);
return ret.promise.then(res => {
const response = JSON.parse(res.body);
console.log(response);
}
) .catch(err => {
console.log('err', err);
}
);
}
demo:https://github.com/chjwrr/RN-react-native-fs
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
