uni_android_plugin_project/uniappWWW/unipluginDemo/utils/download.js

let downloadTask;


async function readLocal(){
	let fs = await requestFileSystem(plus.io.PUBLIC_DOWNLOADS); //获取所要操作根目录File System
	let mFileEntry = await getDirectory({
		OriginPathEntry: fs.root,
		newFileName: 'OXSyncConfig'
	});
	let mConfigEntry = await mGetFile(mFileEntry,"config.json")
	let mReadResult = await mFile(mConfigEntry)
	console.log("读取结果:",mReadResult);
	return mReadResult
}
async function writeLocal(msg){
	let fs = await requestFileSystem(plus.io.PUBLIC_DOWNLOADS); //获取所要操作根目录File System
	let mFileEntry = await getDirectory({
		OriginPathEntry: fs.root,
		newFileName: 'OXSyncConfig'
	});
	let mConfigEntry = await mGetFile(mFileEntry,"config.json")
	// console.log(mConfigEntry.fullPath);
	let mWriteResult = await mCreateWriter(mConfigEntry,msg)
	console.log("写入结果:",mWriteResult);
	return mWriteResult
}

async function writeLocalOld(msg){
	//存储信息到本地,如没有文件,则创建, 有则读取存入
	let fs = await requestFileSystem(plus.io.PUBLIC_DOWNLOADS); //获取所要操作根目录File System
	let mFileEntry = await getDirectory({
		//在PUBLIC_DOWNLOADS下定义人脸库同步文件夹"Face-Sync"
		OriginPathEntry: fs.root,
		newFileName: 'OXSyncConfig'
	});
	// let newNameFileEntry = await resolveLocalFileSystemURL(mFileEntry.fullPath + newName).catch(e => {
	// 	console.log('目标文件可以操作', e);
	// });
	
	let savedFilePathEntry = await resolveLocalFileSystemURL(mFileEntry.fullPath + "config.json"); //获取下载后存储的文件Entry
	
	let write_result =  writeFile(mFileEntry,"config.json",msg)
	
	console.log(9999,JSON.stringify(write_result))
}
async function  readLocalOld(){
	// 读取本地文件
	console.log("readLocal begin")
	let newName = "oxconfig.txt"
	let fs = await requestFileSystem(plus.io.PUBLIC_DOWNLOADS); //获取所要操作根目录File System
	let mFileEntry = await getDirectory({
		//在PUBLIC_DOWNLOADS下定义人脸库同步文件夹"Face-Sync"
		OriginPathEntry: fs.root,
		newFileName: 'OXSyncConfig'
	});
	let newNameFileEntry = await resolveLocalFileSystemURL(mFileEntry.fullPath + newName).catch(e => {
		console.log('目标文件可以操作', e);
	});
	if (newNameFileEntry) {
		console.log("配置文件已存在准:",newNameFileEntry.fullPath)
		// return newNameFileEntry.fullPath  //返回已缓存文件路径
	}
	
	// mFileEntry是操作对象DirectoryEntry
	let result = getFile(mFileEntry,"config.json")
	
	console.log("result: "+JSON.stringify(result))
	
}

//下载数据,当有缓存时直接使用
		//item.url 下载地址
		//item.name 文件名
		//item.forceDownload 当本地存在缓存时,是否强制删除后重新下载
		//item.deleteFile 仅删除文件名为item.name 的文件
async function adDownloadFileAuto(item) {
	let fs = await download.requestFileSystem(plus.io.PUBLIC_DOWNLOADS); //获取所要操作根目录File System
	let url = item.url; //测试url---------
	let newName = item.name;
	let faceSyncEntry = await download.getDirectory({
		//在PUBLIC_DOWNLOADS下定义人脸库同步文件夹"Face-Sync"
		OriginPathEntry: fs.root,
		newFileName: 'ad'
	});
	let newNameFileEntry = await download.resolveLocalFileSystemURL(faceSyncEntry.fullPath + newName).catch(e => {
		console.log('目标文件可以操作', e);
	});
	if (newNameFileEntry) {
		console.log('存在缓存的同名文件:', newNameFileEntry.fullPath);
		
		if(item.deleteFile){
			let delResult = await download.removeFile(newNameFileEntry); //删除已存在的文件
			console.log("删除同名文件结果:",delResult)
			return delResult
		}
		if(item.forceDownload){//当本地存在缓存时,是否强制删除后重新下载
			let delResult = await download.removeFile(newNameFileEntry); //删除已存在的文件
		}else{
			return newNameFileEntry.fullPath  //返回已缓存文件路径
		}
	
	}
	
	let onProgresCallBack = function(e) {
		//预留下载进度封装拓展
		// console.log('下载中...', url, e);
	};
	let tempDownloadFilePath = await download.getDownloadFile({ url, onProgresCallBack }); //获取下载文件临时路径
	let savedFilePath = await download.getSaveFile(tempDownloadFilePath); //将文件临时路径长久存储并清除
	// let newName = item.user_id + '.' + (adType); //命名与android约定的文件名: [user_id].jpg------------
	// newName = item.user_id + this.getName(url);
	console.log(tempDownloadFilePath, 123456, savedFilePath.split('.')[1], savedFilePath);
	let savedFilePathEntry = await download.resolveLocalFileSystemURL(savedFilePath); //获取下载后存储的文件Entry
	
	let reNamePathEntry = await download.moveFileTo(savedFilePathEntry, faceSyncEntry, newName); //重命名文件到人脸库同步文件夹
	// console.log(666,savedFilePath,newName,reNamePathEntry.fullPath)
	return reNamePathEntry.fullPath;
}
function getDownloadFile({
	url,
	onProgresCallBack
}) {
	return new Promise((rs, rj) => {
		if (downloadTask) downloadTask.abort();
		downloadTask = uni.downloadFile({
			url: url,
			timeout:60000,
			// header:{
			// 	"content-type":"image/png"
			// },
			success: res => {
				if (res.statusCode == 200) {
					console.log(url+" downloadFile:"+JSON.stringify(res))
					rs(res.tempFilePath)
				} else {
					console.warn('下载失败--->', res);
					console.warn('下载失败链接--->', url);
					rj(res)
				}
			},
			fail: failRes => {
				console.warn('下载失败--->', failRes);
				console.warn('下载失败链接--->', url);
				rj(failRes)
			}
		})
		downloadTask.onProgressUpdate(res => {
			onProgresCallBack && onProgresCallBack(res);
		})
	})
}
//从临时路径文件获取持久文件
function getSaveFile(url) {
	return new Promise((rs, rj) => {
		uni.saveFile({
			tempFilePath: url,
			success: function(res_save) {
				var savedFilePath = res_save.savedFilePath; //相对路径
				// var absFilePath = plus.io.convertLocalFileSystemURL(savedFilePath); //绝对路径
				// console.log('相对路径: ' + savedFilePath);
				// console.log("绝对路径: " + absFilePath);
				rs(savedFilePath)
				// uni.getSavedFileList({
				//   success: function (res) {
				//     console.log(res.fileList);
				//   }
				// });
			},
			fail: function(e) {
				rj(e);
			}
		});
	})

}
//根据本地文件url转换为fileEntry
function resolveLocalFileSystemURL(FilefullPath) {
	return new Promise((rs, rj) => {
		plus.io.resolveLocalFileSystemURL(FilefullPath,
			function(fs) {
				rs(fs)
			},
			function(err) {
				rj(err)
			});
	})
}
// 请求本地文件系统对象Entry
// type:
// 应用私有资源目录，对应常量plus.io.PRIVATE_WWW，仅应用自身可读
// 应用私有文档目录，对应常量plus.io.PRIVATE_DOC，仅应用自身可读写
// 应用公共文档目录，对应常量plus.io.PUBLIC_DOCUMENTS，多应用时都可读写，常用于保存应用间共享文件
// 应用公共下载目录，对应常量plus.io.PUBLIC_DOWNLOADS，多应用时都可读写，常用于保存下载文件
//fs.root 为相应Entry
function requestFileSystem(type) {
	return new Promise((rs, rj) => {
		plus.io.requestFileSystem(type,
			function(fs) {
				rs(fs)
			},
			function(err) {
				rj(err)
			});
	})
}
//移动文件(重命名)
 function moveFileTo(fromPathEntry, toPathEntry, newFileName) {
	return new Promise((rs, rj) => {
		// remove this directory
		// entry.remove( function ( entry ) {
		// 	plus.console.log( "Remove succeeded" );
		// }, function ( e ) {
		// 	alert( e.message );
		// } );
		
		fromPathEntry.moveTo(toPathEntry, newFileName, function(entry) {
			// console.log("新文件路径: " + entry.fullPath);
			rs(entry)
		}, function(e) {
			console.log(e.message);
			rj(e);
		});
	})
}
// 删除文件
function removeFile(entry){
    // return new Promise(rs=>entry.remove( rs, rs ))
	return new Promise((rs,rj)=>{
		entry.remove( function ( entry ) {
			console.log(entry)
			rs( "Remove succeeded: "+entry.name );
		}, function ( e ) {
			rj( e.message );
		} );
	})
}
// 递归删除目录
function removeFileAll(entry){
    return new Promise(rs=>entry.removeRecursively( rs, rs ))
}
//创建,读取文件
// 废弃
// function getFile(mFileEntry,path){
// 	// entry.getFile( path, flag, succesCB, errorCB );
// 		mFileEntry.getFile(path,{create:true}, function(fileEntry){
// 			fileEntry.file( function(file){
// 				var fileReader = new plus.io.FileReader();
// 				console.log("getFile:" + JSON.stringify(file));
// 				fileReader.readAsText(file, 'utf-8');
// 				fileReader.onloadend = function(evt) {
// 					console.log("evt:" + evt);
// 					console.log("evt.target" + evt.target);
// 					console.log(evt.target.result);
// 					rs(evt.target.result)
// 				}
// 				console.log( ">>>>>>>文件信息:"+file.name + ' : ' + file.size +" Kb <<<<<<<<");
// 			} );
// 		});
// }
// //废弃
// function writeFile(mFileEntry,path,msg){
// 	// Write data to file
// 		mFileEntry.getFile(path,{create:true}, function(fileEntry){
// 			fileEntry.createWriter( function ( writer ) {
// 				writer.onwrite = function ( e ) {
// 					console.log( "Write data success!" );
// 					rs(true)
// 				};
// 				// Write data to the end of file.
// 				// writer.seek( writer.length );
// 				writer.write(JSON.stringify(msg));
// 			}, function ( e ) {
// 				console.log( e.message );
// 				rj(false)
// 			} );
// 		});
// }
//获取file Entry
function mGetFile(mFileEntry,path){
	return new Promise((rs,rj)=>{
		mFileEntry.getFile(path,{create:true}, function(fileEntry){
			rs(fileEntry)
		});
	})
}
//获取操作file
function mFile(fileEntry){
	return new Promise((rs,rj)=>{
		fileEntry.file( function(file){
			var fileReader = new plus.io.FileReader();
			// console.log("getFile:" + JSON.stringify(file));
			fileReader.readAsText(file, 'utf-8');
			fileReader.onloadend = function(evt) {
				// console.log("evt:" + evt);
				// console.log("evt.target" + evt.target);
				// console.log(evt.target.result);
				rs(evt.target.result)
			}
			console.log( ">>>>>>>文件信息:"+file.name + ' : ' + file.size +" B <<<<<<<<"+ JSON.stringify(file));
		} );
	})
}
//读取文件
function mCreateReader(fileEntry){
	return new Promise((rs,rj)=>{
		fileEntry.createWriter( function ( writer ) {
			writer.onwrite = function ( e ) {
				console.log( "Write data success!" );
				rs("success")
			};
			// Write data to the end of file.
			// writer.seek( writer.length );
			writer.write(JSON.stringify(msg));
		}, function ( e ) {
			console.log( e.message );
			rj(e.message)
		} );
		
	})
}
//写入文件
function mCreateWriter(fileEntry,msg){
	return new Promise((rs,rj)=>{
		fileEntry.createWriter( function ( writer ) {
			writer.onwrite = function ( e ) {
				console.log( "Write data success!" );
				rs("success")
			};
			// Write data to the end of file.
			// writer.seek( writer.length );
			writer.write(JSON.stringify(msg));
		}, function ( e ) {
			console.log( e.message );
			rj(e.message)
		} );
		
	})
}

// 从父目录下创建或打开子目录
function getDirectory({
	OriginPathEntry,
	newFileName
}) {
	return new Promise((rs, rj) => {
		// Retrieve an existing directory, or create it if it does not already exist
		OriginPathEntry.getDirectory(newFileName, {
			create: true,
			exclusive: false
		}, function(dir) {
			// console.log("Directory Entry Name: " + dir.name);
			rs(dir)
		}, function(e) {
			console.log(dir.name,e.message);
			rj(e)
		});
	})
}
//获取该DirectoryEntry下所有文件和子目录
function getFileChildrenList(DirectoryEntry){
	return new Promise((rs, rj) => {
		// 创建读取目录信息对象 
		var directoryReader = DirectoryEntry.createReader();
		directoryReader.readEntries( function( entries ){
			var i,res=[];
			for( i=0; i < entries.length; i++ ) {
				// console.log( entries[i].name );
				res.push( entries[i].name)
			}
			rs(res)
		}, function ( e ) {
			console.log( "Read entries failed: " + e.message );
			rj(e.message)
		} );
	
	})
}

module.exports = {
	getSaveFile,
	getDownloadFile,
	requestFileSystem,
	resolveLocalFileSystemURL,
	moveFileTo,
	getDirectory,
	removeFile,
	removeFileAll,
	readLocal,
	writeLocal,
	getFileChildrenList
}