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

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

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

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

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

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

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。