Node. jsStream (Stream)

Pipeline stream inputs data from one stream into another. learning points:

Read data from the stream

Write stream

Pipeline Flow

Chained stream

Node. js Stream (Stream)

Read data from the stream

Case: main. js

[Code] var fs = require ('fs'); var data = ''; // create a readable stream var readerStream = fs.createReadStream('input.txt '); // set utf8 encoding readerStream. setEncoding ('utf8'); // Process Stream events // trigger readerStream when data is readable. on ('data', function (chunk) {data + = chunk;}); // end triggers readerStream when no data is read. on ('end', function () {console. log (data) ;}); // error is triggered when an error occurs during receiving and writing. ReaderStream. on ('error', function (err) {console. log (err. stack) ;}); console. log ('program execution is complete. ');

Case: main2.js

[Code] var fs = require ('fs'); var data = 'Who am I? '; // Create the write stream var writeStream = fs.createWriteStream('ouput.txt'); // encode writeStream. write (data, 'utf8'); // mark the writeStream at the end of the file. end (); // triggered when stream event processing // finish all data has been written to the final level system. WriteStream. on ('finish ', function () {console. log ('write finished ') ;}); // error reading and writing data triggers writeStream. on ('error', function (err) {console. log (err. stack) ;}); console. log ('program execution is complete. ');

Case: pipe. js

[Code] var fs = require ('fs'); // create a readable stream var readerStream = fs.createReadStream('input.txt '); // create a write stream var writeStream = fs.createWriteStream('ouput.txt '); // read and write the readerStream In the MPs queue. pipe (writeStream); console. log ('program execution is complete. ');

Case: compressed file express. js

[Code] var fs = require ('fs'); var zlib = require ('zlib '); // compress input.txt to input.gzfs.createReadStream('input.txt '). pipe (zlib. createGzip () .pipe(fs.createWriteStream('input.gz '); console. log ('compressed file ');

Case: decompress the file decompress. js

[Code] var fs = require ('fs'); var zlib = require ('zlib '); // decompress input.gz to input.gz.txtfs.createReadStream('input.gz '). pipe (zlib. createGunzip () .pipe(fs.createWriteStream('input.gz.txt '); console. log ('decompress The file ');

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