遍历文件夹Node.JS中的文件

Question

我试图遍历并拾取目录中的文件，但是在实现它时遇到了一些麻烦。如何提取多个文件，然后将它们移动到另一个文件夹？

var dirname = 'C:/FolderwithFiles';
console.log("Going to get file info!");
fs.stat(dirname, function (err, stats) {
    if (err) {
        return console.error(err);
    }
    console.log(stats);
    console.log("Got file info successfully!");

    // Check file type
    console.log("isFile ? " + stats.isFile());
    console.log("isDirectory ? " + stats.isDirectory());
});

Answer 1

带回调的旧答案

您想要使用fs.readdir函数获取目录内容，并使用fs.rename函数实际执行重命名。如果您
需要 等待它们完成之后再运行代码，则这两个函数都具有同步版本。

我写了一个快速脚本来完成您所描述的。

var fs = require('fs');
var path = require('path');
// In newer Node.js versions where process is already global this isn't necessary.
var process = require("process");

var moveFrom = "/home/mike/dev/node/sonar/moveme";
var moveTo = "/home/mike/dev/node/sonar/tome"

// Loop through all the files in the temp directory
fs.readdir(moveFrom, function (err, files) {
  if (err) {
    console.error("Could not list the directory.", err);
    process.exit(1);
  }

  files.forEach(function (file, index) {
    // Make one pass and make the file complete
    var fromPath = path.join(moveFrom, file);
    var toPath = path.join(moveTo, file);

    fs.stat(fromPath, function (error, stat) {
      if (error) {
        console.error("Error stating file.", error);
        return;
      }

      if (stat.isFile())
        console.log("'%s' is a file.", fromPath);
      else if (stat.isDirectory())
        console.log("'%s' is a directory.", fromPath);

      fs.rename(fromPath, toPath, function (error) {
        if (error) {
          console.error("File moving error.", error);
        } else {
          console.log("Moved file '%s' to '%s'.", fromPath, toPath);
        }
      });
    });
  });
});

在我的本地机器上测试。

node testme.js 
'/home/mike/dev/node/sonar/moveme/hello' is a file.
'/home/mike/dev/node/sonar/moveme/test' is a directory.
'/home/mike/dev/node/sonar/moveme/test2' is a directory.
'/home/mike/dev/node/sonar/moveme/test23' is a directory.
'/home/mike/dev/node/sonar/moveme/test234' is a directory.
Moved file '/home/mike/dev/node/sonar/moveme/hello' to '/home/mike/dev/node/sonar/tome/hello'.
Moved file '/home/mike/dev/node/sonar/moveme/test' to '/home/mike/dev/node/sonar/tome/test'.
Moved file '/home/mike/dev/node/sonar/moveme/test2' to '/home/mike/dev/node/sonar/tome/test2'.
Moved file '/home/mike/dev/node/sonar/moveme/test23' to '/home/mike/dev/node/sonar/tome/test23'.
Moved file '/home/mike/dev/node/sonar/moveme/test234' to '/home/mike/dev/node/sonar/tome/test234'.

更新：fs.promises函数具有异步/等待功能

受ma11hew28答案的启发，这与上面相同，但具有fs.promises中的异步功能。如ma11hew28所述，与v12.12.0中添加的fs.promises.opendir
相比，它可能具有内存限制。

下面的快速代码。

//jshint esversion:8
//jshint node:true
const fs = require( 'fs' );
const path = require( 'path' );

const moveFrom = "/tmp/movefrom";
const moveTo = "/tmp/moveto";

// Make an async function that gets executed immediately
(async ()=>{
    // Our starting point
    try {
        // Get the files as an array
        const files = await fs.promises.readdir( moveFrom );

        // Loop them all with the new for...of
        for( const file of files ) {
            // Get the full paths
            const fromPath = path.join( moveFrom, file );
            const toPath = path.join( moveTo, file );

            // Stat the file to see if we have a file or dir
            const stat = await fs.promises.stat( fromPath );

            if( stat.isFile() )
                console.log( "'%s' is a file.", fromPath );
            else if( stat.isDirectory() )
                console.log( "'%s' is a directory.", fromPath );

            // Now move async
            await fs.promises.rename( fromPath, toPath );

            // Log because we're crazy
            console.log( "Moved '%s'->'%s'", fromPath, toPath );
        } // End for...of
    }
    catch( e ) {
        // Catch anything bad that happens
        console.error( "We've thrown! Whoops!", e );
    }

})(); // Wrap in parenthesis and call now