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angular 读写本地电脑文件 angular将数据写进到电脑文件 在前端写一个按钮，然后点击按钮的时候在本地电脑保存一个text文件。 这时候我们需要用到一个angular的插件，叫做“FileSaver.js” 官方github： https://github.com/eligrey/FileSaver.js 插件安装： npm install file-saver --save html： <button style="background-color: yellow;float: left" (click)="writeText()">将此配置读入文件</button> ts： writeText() { if (confirm('确定保存？')) { const str = '这是文件的内容' const FileSaver = require('file-saver'); const blob = new Blob([str], {type: 'text/plain;charset=utf-8'}); FileSaver.saveAs(blob, '这是文件名.txt'); } } ok ,文件保存到本地就可以实现了。然后是读取本地文件。 从电脑本地读取文件到angular 在前端创建一个按钮来读取文件 html： <form style=" background

I am currently working on a website where, roughly 40 million documents and images should be served to it's users. I need suggestions on which method is the most suitable for storing content with subject to these requirements. System should be highly available, scale-able and durable. Files have to be stored permanently and users should be able to modify them. Due to client restrictions, 3rd party object storage providers such as Amazon S3 and CDNs are not suitable. File size of content can vary from 1 MB to 30 MB. (However about 90% of the files would be less than 2 MB) Content retrieval

blob has null prepended at the start eg : blob:null/72438-4637-23673-34721. But when I use the same as a src to the , it shows up the correct image. I am using URL.createObjectURL call. I also tried using webkitURL. Both return a blob with null appended at the start. Also the blob value returned by URL and webkitURL are not the same. Here is the code snippet var dataUrl = canvas.toDataURL(); // The last piece of the data URL after the comma var byteString = atob(dataUrl.split(',')[1]); // Populate an array buffer var arrayBuffer = new ArrayBuffer(byteString.length); var uint8Array = new

I am trying to find an easy solution to implement the OCR algorithm from OPenCV . I am very new to Image Processing ! I am playing a video that is decoded with specific codec using RLE algorithm . What I would like to do is that for each decoded frame, I would like to compare it with the previous one and store the pixels that have changed between the two frames. Most of the existing solutions gives a difference between the two frames but I would like to just keep the new pixels that have changed and store it in a table and then be able to analyze every group of pixels that have changed instead

This code is used to download a pdf via blob. It works fine on every browser except Safari 12 for macOS and iOS. Even Safari 11 works. When I run the code the very first time, it works fine, but every time after that it gives me "WebKitBlobResource error 1" function downloadFileFromBlob(fileBlob, fileName) { if (/\bMSIE\b|\bTrident\b/.test($window.navigator.userAgent)) { $window.navigator.msSaveOrOpenBlob(fileBlob, fileName); } else { var fileURL = $window.URL.createObjectURL(fileBlob); createDownloadElementAndClick(fileURL, fileName); } } function createDownloadElementAndClick(fileURL,

1、java web 后端代码 @RequestMapping(value = {"/img/render"}, method = {RequestMethod.GET, RequestMethod.POST, RequestMethod.OPTIONS}) @CrossOrigin @ResponseBody public String getPic(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) { String path = "C:\\Users\\admin\\Pictures\\11.jpg"; FileInputStream fis = null; OutputStream os = null; try { fis = new FileInputStream(path); os = httpServletResponse.getOutputStream(); int count = 0; byte[] buffer = new byte[1024 * 8]; while ((count = fis.read(buffer)) != -1) { os.write(buffer, 0, count); os.flush(); } } catch

I try to create a Blob object and pass an Uint8Array to it’s constructor It works fine on chrome and firefox on windows In chrome and safari on ios however the Blod does not contain the data of the Uint8Array but the text : [object Uint8Array] I need this to upload a canvas to the server. Is there a workaround? I'm struggling with the exact same problem. When I backup the Uint8Array with an ArrayBuffer, it does work in both Safari and Chrome (not tested in other browsers yet) but Chrome prints a warning message. Chrome says I have to wrap ArrayBuffer in a DataView before passing it to Blob()

1.BOLB转word文件 import java.io.*; import java.sql.*; public class Test { Connection con = null; Statement stmt = null; ResultSet rs = null; private ResultSet getResultSet() { try { Class.forName("oracle.jdbc.driver.OracleDriver").newInstance(); String url = "jdbc:oracle:thin:@10.23.117.110:1521:zgzhms"; String user = "ibms"; String password = "ibms"; con = DriverManager.getConnection(url, user, password); stmt = con.createStatement(); String sql = "SELECT t.TXN_TRADE FROM T_TXN_TRADE t WHERE t.txn_trade_id = 1"; rs = stmt.executeQuery(sql); } catch (Exception e) { e.printStackTrace(); } return