filereader example

http://blog.csdn.net/zk437092645/article/details/8745647Used to read the file into memory and read the data in the file. The FileReader interface provides an asynchronous API that allows you to asynchronously access the file system in the main thread of the browser and read the data in the file. To current civilian, only ff3.6+ and chrome6.0+ implemented the FileReader interface.1, the method of

------Dark Horse programmer--21, character stream filereader,filewriter,bufferedwriter,bufferedreader, decorative design mode, LineNumberReader/*Buffer technology for character streams:For some large files, if you read a word characters write a character, read and write operations are too frequent.In order to solve this problem, buffer technology was introduced.Buffer technology is based on the flow (must have a flow first) to enhance the flow of data

Article reprinted from: http://blog.okbase.net/jquery2000/archive/1296.html;The Readasdataurl method of the FileReader object encodes the read file into the data URL. The data URL is a special technique that allows you to embed data (such as a sample) in a Web page without putting it in an external file. The advantage of using the data URL is that you do not need to send an additional HTTP request to the server to obtain additional data, and the disad

Javascript uses fileReader to upload images and javascript to upload files I will not explain the File API in detail here. We will use the File handle to read the File content. This is achieved through FileReader and through the FileReader interface, we can asynchronously load the file content into the memory and assign a js variable. Copy codeThe Code is as foll

There is a UTF-8-encoded text file that reads a string with filereader and then converts the character set: Str = newstring (Str. getbytes (), "UTF-8"); the result is that most Chinese characters are displayed normally, but some Chinese characters are still displayed as question marks!Java codePublic static list List Try {Bufferedreader BR = new bufferedreader (New filereader (filename ));String line = NULL

JS uses FileReader to implement the local preview function before uploading images, Introduction During Image Upload and preview, if there are no special requirements, you can directly upload the image to the background, and then get the URL and render it to the page, in this way, there is no problem when the image is relatively small. If it is bigger, it will be slower to see the preview, and a junk file is generated, so it is better to preview it lo

HTML5 defines FileReader as an important member of the file API for reading files, and the FileReader interface provides a way to read the file and an event model that contains the read result, according to the definition of the system. FileReader is very simple to use, you can create a FileReader object and invoke its

FileReader method Method Name Parameters Description Abort None Interrupt Read Readasbinarystring File (BLOB) To read a file as a binary code Readasdataurl File (BLOB) Read the file as Dataurl Readastext File, (BLOB) To read a file as text FileReader Events

Recent research on point-to-point file transfer, think of a scheme filereader+webrtc.When I see FileReader, oh, good things ah, carefully look at the file API, or called the Web API.File API Official document file APISome of the MDN's open Web apis| MDNIt mainly consists of, filelist,blob,file,filereader and so on.Here we mainly discuss the

Used to read the file into memory and read the data in the file.The FileReader interface provides an asynchronous API that allows you to access the file system asynchronously in the main thread of the browser, reading the data in the file Method of FileReader interface Method Name Parameters Description Readasbinarystring File To read a fi

What methods and events does FileReader support? I will not introduce them here. if you are interested, go to the w3c official website to see the introduction of FileReader. here I will mainly introduce the common applications of FileReader, and fileReader. I will not explain the File API in detail here. we will use th

What methods and events does FileReader support? I will not introduce them here. If you are interested, go to the w3c official website to see the introduction of FileReader. Here I will mainly introduce the common applications of FileReader, and fileReader. I will not explain the File API in detail here. We will use th

I. FileReader class1, construction method:FileReader fr = new FileReader (String fileName);//Use the construction method of the string parameter with the specified file. Creates the input stream object. and associate the source file.2, the Main method:int read (); Reads a single character, returns an int variable that represents the read character, and returns 1 if the end of the stream has been reached.int

FileReader uploads images, Drag an image to display the image and adjust the size before uploading it to the server. Use HTML5 Dragenter Dragover Dragleave Drop The FileReader class is used for image display. Var files = event. dataTransfer. files; // gets the drag-and-drop image set. Filereader. readAsDataURL (files [I]); Use this. result show the im

InputStreamReader and BufferedReader. One of the most important classes is InputStreamReader, which is a bridge that converts bytes into characters. You can specify the encoding in the constructor, and if you do not specify it, the default encoding for the underlying operating system, such as GBK, is used.FileReader and InputStreamReader involve encoding conversions (specifying encoding or using OS default encoding) toCan appear garbled on different platforms! The FileInputStream is processed in

1//Create a FileReader object2 var reader = new FileReader (); 3 4//Bind Load Event 5 Reader.onload = function (e) {6 console.log (E.target.result); 7} 8 9//Read data for file Object Reader.readAsdataurl (Document.queryselector ("Input[type=file]"). Files[0]); The Load event is triggered when the FileReader object reads the data successfully through Readasdataurl

Java Tour (24)--i/o stream, character stream, filewriter,ioexception, file continuation, FileReader, small exercise The Java tour is also written more than 20, we finally reached the I/O today. If you beginner, do not understand the IO stream, you can look at slowly after the trip, but you work for a while you will find that the flow of the use of the scene and the technical point is very tough, we are bound to grasp this knowledge point, if

Yes:Domstring, Document, FormData, Blob, File, ArrayBufferLook at Zhang's blog. http://www.zhangxinxu.com/wordpress/2013/10/understand-domstring-document-formdata-blob-file-arraybuffer/Where the FileReader interface does some preparation:1, the method of FileReader interfaceThe FileReader interface has 4 methods, 3 of which are used to read the file and the other

Local Link for uploading images -- FileReader,Reference website FileReader-Web API | MDNDEMOIntroduction With the FileReader object, web applications can asynchronously read files (or raw data buffering) stored on users' computers, you can use a File object or Blob Object to specify the File or data to be processed. the File object can be the FileList object retu