uniapp安卓读取或写入txt文件，创建文件或文件夹，获取手机内置存储根路径

使用应开启以下权限（读取和写入） 

原理：利用H5plus的native，引入java类来进行处理。

File.js

const root = function() {const environment = plus.Android.importClass("android.os.Environment");return environment.getExternalStorageDirectory();}const filelist = function(dir = '') {const File = plus.android.importClass("java.io.File");let list = [];let file = new File(dir);let tempList = file.listFiles();for (let i = 0; i < tempList.length; i++) {let fileName = tempList[i].getName();list.push(fileName);}return list;}const createNewFile = function(path = '') {const File = plus.android.importClass('java.io.File');let file = new File(path);if (!file.exists()) {return file.createNewFile();}return false;}const mkdirs = function(path = ''){const File = plus.android.importClass('java.io.File');let file = new File(path);if (!file.exists()) {return file.mkdirs();}return false;}const readTxt = function(path = '', charset = 'utf-8') {const File = plus.android.importClass('java.io.File');const InputStreamReader = plus.android.importClass('java.io.InputStreamReader');const BufferedReader = plus.android.importClass('java.io.BufferedReader');const FileInputStream = plus.android.importClass('java.io.FileInputStream');let file = new File(path);let inputStreamReader = null;let bufferedReader = null;let list = [];try {if (!file.exists()) {return false;}inputStreamReader = new InputStreamReader(new FileInputStream(file), charset);bufferedReader = new BufferedReader(inputStreamReader);let line = '';while (null != (line = bufferedReader.readLine())) {list.push(line);}bufferedReader.close();inputStreamReader.close();} catch (e) {if (null != bufferedReader) {bufferedReader.close();}if (null != inputStreamReader) {inputStreamReader.close();}return false;}return list;}const writeTxt = function(path = '', content = '', append = false, charset = 'utf-8') {const File = plus.android.importClass('java.io.File');const FileOutputStream = plus.android.importClass('java.io.FileOutputStream');const OutputStreamWriter = plus.android.importClass('java.io.OutputStreamWriter');let outputStreamWriter;let file = new File(path);try {//不存在则创建新的文件if (!file.exists()) {file.createNewFile();}outputStreamWriter = new OutputStreamWriter(new FileOutputStream(path, append), charset);outputStreamWriter.write(content);outputStreamWriter.close();} catch (e) {if (null != outputStreamWriter) {outputStreamWriter.close();}return false;}return true;}export default {root,filelist,createNewFile,mkdirs,readTxt,writeTxt}

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来源地址：https://blog.csdn.net/fentashen9162/article/details/131141071