Node.js fs.createReadStream()方法
原文:https://www . geesforgeks . org/node-js-fs-createreadstream-method/
createReadStream()方法是 fs 模块的内置应用编程接口，允许您打开文件/流并读取其中存在的数据。 语法:
fs.createReadStream( path, options )
参数:该方法接受两个参数，如上所述，如下所述:
- 路径:此参数保存读取文件的文件路径。它可以是字符串、缓冲区或网址。
- 选项:是保存字符串或对象的可选参数。
返回值:该方法返回 fs。ReadStream 对象。 以下示例说明了 Node.js 中的 createReadStream()方法【T4: 示例 1:****
java 描述语言
// Node.js program to demonstrate the
// fs.createReadStream() method
// Include fs module
let fs = require('fs'),
// Use fs.createReadStream() method
// to read the file
reader = fs.createReadStream('input.txt');
// Read and display the file data on console
reader.on('data', function (chunk) {
console.log(chunk.toString());
});
输出:
input.txt file data:
GeeksforGeeks: A computer science portal for geeks
例 2:
java 描述语言
// Node.js program to demonstrate the
// fs.createReadStream() method
// Include fs module
let fs = require('fs'),
// Use fs.createReadStream() method
// to read the file
reader = fs.createReadStream('input.txt', {
flag: 'a+',
encoding: 'UTF-8',
start: 5,
end: 64,
highWaterMark: 16
});
// Read and display the file data on console
reader.on('data', function (chunk) {
console.log(chunk);
});
输出:
forGeeks: A comp
uter science por
tal for geeks
参考:T2】https://nodejs . org/API/fs . html # fs _ fs _ createreadstream _ path _ optionsT4】
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