filereader

关于TXT文件中英文字母出现频率排序问题

由 无人久伴 提交于 2019-12-03 17:30:21
题目要求： 　　输出某个英文文本文件中 26 字母出现的频率，由高到低排列，并显示字母出现的百分比，精确到小数点后面两位。 源码： 　　 package demo; import java.io.File; import java.io.InputStreamReader; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.FileInputStream; import java.io.FileReader; import java.util.Arrays; import java.util.List; import java.util.StringTokenizer; import java.io.FileWriter; public class Demo { static String[] save = new String[50000]; static float[] num1 = new float[26]; static float[] num2 = new float[26]; static float[] num3 = new float[52]; static char zimu[]={'A','B','C','D','E','F','G','H','I','J'

vue中读取excel中数据

由 ▼魔方 西西 提交于 2019-12-03 16:46:43
安装xlsx 　　npm install xlsx --save-dev 安装好后在需要的页面 引入插件 　　import xlsx from 'xlsx' 调用 　　 $('#uploadFile').change((e) => { var files = e.target.files; var fileReader = new FileReader(); fileReader.onload = function(ev) { console.log(ev,'ev') try { var data = ev.target.result, workbook = XLSX.read(data, { type: 'binary' }), // 以二进制流方式读取得到整份excel表格对象 persons = []; // 存储获取到的数据 } catch (e) { console.log('文件类型不正确'); return; } // 表格的表格范围，可用于判断表头是否数量是否正确 var fromTo = ''; // 遍历每张表读取 for (var sheet in workbook.Sheets) { if (workbook.Sheets.hasOwnProperty(sheet)) { fromTo = workbook.Sheets[sheet]['!ref'];

How to easily process CSV file to List<MyClass>

由 妖精的绣舞 提交于 2019-12-03 15:23:29
In my application I use a lot of CSV files which I have to read and build a lists based on them. I'd like to discover an easy way to do this. Do you know any easy framework which does it without using number of config files etc? For instance, I have got a class Person: public class Person { String name; String surname; double shoeSize; boolean sex; // true: male, false:female public Person() { } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getSurname() { return surname; } public void setSurname(String surname) { this.surname =

Using FileReader.readAsArrayBuffer() on changed files in Firefox

由 别说谁变了你拦得住时间么 提交于 2019-12-03 11:21:18
问题 I'm running into an odd problem using FileReader.readAsArrayBuffer that only seems to affect Firefox (I tested in the current version - v40). I can't tell if I'm just doing something wrong or if this is a Firefox bug. I have some JavaScript that uses readAsArrayBuffer to read a file specified in an <input> field. Under normal circumstances, everything works correctly. However, if the user modifies the file after selecting it in the <input> field, readAsArrayBuffer can get very confused. The

输入流之FileInputStream

由 [亡魂溺海] 提交于 2019-12-03 10:12:12
FileInputStream可以从系统文件中获取输入字节，也从可以从诸从图象数据的的原始字节流中读取。 如果是读取字符串流，推荐使用FileReader。 感觉就是视频，音频，图象之类的文件，就用FileInputStream读取。而如果是纯文字（字符串）文件就用FileReader读取。 来源： https://www.cnblogs.com/z-qinfeng/p/11788008.html

Angular2 + Typescript + FileReader.onLoad = property does not exist

由 偶尔善良 提交于 2019-12-03 10:06:54
I am using the FileReader Interface and it’s asynchronous method readAsText() to read a local text file, After that when the onload event is called, I try to read my file, my source code is something like the following: export class ReadFileComponent { text: string; readFile(): void { let reader=new FileReader(); reader.onload = function(e) { this.text=reader.result; } reader.readAsText(file); } } compilation is failed because Property "text" does not exist on type "FileReader" I think this is due to the EventListener interface does not accept objects , did someone please solve this kind of

Converting byte array to Json giving avro Schema as input is giving an error

由 匿名 (未验证) 提交于 2019-12-03 09:02:45
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a simple JSON String jsonPayload = "{\"empid\": \"6\",\"empname\": \"Saurabh\",\"address\": \"home\"}"; jsonPayload.getBytes(); I created avro schema {"namespace": "sample.namespace", "type": "record", "name": "Employee", "fields": [ {"name": "empid", "type": "string"}, {"name": "empname", "type": "string"}, {"name": "address", "type": "string"} ] } When I try to compare them I get an error Exception : org.apache.avro.AvroRuntimeException: Malformed data. Length is negative: -62 at org.apache.avro.io.BinaryDecoder.doReadBytes

FileReader.js nothing happens in IE9

由 匿名 (未验证) 提交于 2019-12-03 08:48:34
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I need help setting up Jadriens FileReader.js . I have set up everything as I think this polyfill works. But the callback that fires when everything is initiated doesn't fire in IE9. This is my markup: <body> <div class="main"> <canvas id="mainCanvas" width="600" height="600"></canvas><br /> <div id="fileReaderSWFObject"></div> <input type="file" id="imageLoader" name="imageLoader" /><br /> <input id="text" type="text" placeholder="some text..."> </div> <script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js"></script>

IndexedDB: Store file as File or Blob or ArrayBuffer. What is the best option?

由 回眸只為那壹抹淺笑 提交于 2019-12-03 08:32:20
问题 Now most of browsers are supporting IndexedDB to store data/file directly as File , Blob or ArrayBuffer . This code saves a IDB key 'File1' as File <input type="file" id="userfile" /> var a = document.getElementById("userfile"); var b = a.files[0]; Now we can directly save this file to IDB using the following code //LocalForage is a library for indexedDB developed by Mozilla //Note: localforage._config.driver=asyncStorage (IDB method) function run(){ //"File1" = IDB data table key and b=value

Chrome FileReader

由 匿名 (未验证) 提交于 2019-12-03 08:28:06
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Can someone give me an example of using the FileReader API go get contents of a file in chrome? It seems to be returning undefined for me. FileReader Test 回答1: My problem was that I assumed FileReader was sychronous. Here is the right way to do it. If you are on chrome, this code has to be running on a server (localhost or on a site). It won't work with a local file. FileReader that works! 回答2: The File API FileReader object operates the same way in Chrome as it does in FireFox, Opera, or Internet Explorer 10 (Yup, works in IE ). Simple
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