本文内容：
react-native-fs的简单使用
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：
rush:bash;">
npm install react-native-fs --save
第二步：
rush:js;">
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
rush:js;">
import RNFS from 'react-native-fs';
下载文件
// 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 = '//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
// 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
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
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
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
const uploadUrl = 'http://buz.co/rnfs/upload-tester.php';
const options = {
toUrl: uploadUrl,files: [{name: 'myfile',filename: 'test.txt',filepath: uploadSrc,filetype: 'text/plain'}],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);
});
}
