node删除、复制文件或文件夹代码实例

const fs = require('fs')
const path = require('path')
const child_process = require('child_process')
const fsEx = require('fs-extra')
/**
 * @des 该包为实验性API
 */
const fsPromises = require('fs').promises

/**
 * @param { copiedPath: String } (被复制文件的地址，相对地址)
 * @param { resultPath: String } (放置复制文件的地址，相对地址)
 */
function copyFile(copiedPath, resultPath) {
 copiedPath = path.join(__dirname, copiedPath)
 resultPath = path.join(__dirname, resultPath)

 try {
  /**
   * @des 方式一
   */
  // fs.writeFileSync(resultPath, fs.readFileSync(copiedPath))
  /**
   * @des 方式二
   */
  // fs.copyFileSync(copiedPath, resultPath)
  console.log('success');
 } catch (error) {
  console.log(error);
 }
 /**
  * @des 方式三
  */
 fsPromises.copyFile(copiedPath, resultPath)
  .then(() => {
   console.log('success');
  }).catch((err) => {
   console.log(err);
  });
}

/**
 * @param { delPath：String } （需要删除文件的地址）
 * @param { direct：Boolean } （是否需要处理地址）
 */
function deleteFile(delPath, direct) {
 delPath = direct ? delPath : path.join(__dirname, delPath)
 try {
  /**
   * @des 判断文件或文件夹是否存在
   */
  if (fs.existsSync(delPath)) {
   fs.unlinkSync(delPath);
  } else {
   console.log('inexistence path：', delPath);
  }
 } catch (error) {
  console.log('del error', error);
 }
}

/**
 * @des 参数解释同上
 */
function copyFolder(copiedPath, resultPath, direct) {
  if(!direct) {
    copiedPath = path.join(__dirname, copiedPath)
    resultPath = path.join(__dirname, resultPath)
  }

  function createDir (dirPath) {
    fs.mkdirSync(dirPath)    
  }

  if (fs.existsSync(copiedPath)) {
    createDir(resultPath)
    /**
     * @des 方式一：利用子进程操作命令行方式
     */
    // child_process.spawn('cp', ['-r', copiedPath, resultPath])

    /**
     * @des 方式二：
     */
    const files = fs.readdirSync(copiedPath, { withFileTypes: true });
    for (let i = 0; i < files.length; i++) {
      const cf = files[i]
      const ccp = path.join(copiedPath, cf.name)
      const crp = path.join(resultPath, cf.name) 
      if (cf.isFile()) {
        /**
         * @des 创建文件,使用流的形式可以读写大文件
         */
        const readStream = fs.createReadStream(ccp)
        const writeStream = fs.createWriteStream(crp)
        readStream.pipe(writeStream)
      } else {
        try {
          /**
           * @des 判断读(R_OK | W_OK)写权限
           */
          fs.accessSync(path.join(crp, '..'), fs.constants.W_OK)
          copyFolder(ccp, crp, true)
        } catch (error) {
          console.log('folder write error:', error);
        }

      }
    }
  } else {
    console.log('do not exist path: ', copiedPath);
  }
}

function deleteFolder(delPath) {
  delPath = path.join(__dirname, delPath)

  try {
    if (fs.existsSync(delPath)) {
      const delFn = function (address) {
        const files = fs.readdirSync(address)
        for (let i = 0; i < files.length; i++) {
          const dirPath = path.join(address, files[i])
          if (fs.statSync(dirPath).isDirectory()) {
            delFn(dirPath)
          } else {
            deleteFile(dirPath, true)
          }
        }
        /**
        * @des 只能删空文件夹
        */
        fs.rmdirSync(address);
      }
      delFn(delPath);
    } else {
      console.log('do not exist: ', delPath);
    }
  } catch (error) {
    console.log('del folder error', error);
  }
}

/**
 * @des 获取命令行传递的参数
 */
const type = process.argv[2]

function execute() {
  /**
   * @des 请根据不同的条件传递参数
   */
  if (type === 'copyFile') {
    copyFile('./p/a.txt', './c/k.txt')
  }

  if (type === 'copyFolder') {
    copyFolder('./p', './a')
  }

  if (type === 'delFile') {
    deleteFile('./c/ss.txt')
  }

  if (type === 'delFolder') {
    deleteFolder('./a')
  }
}

execute()

/**
 * @des 命令行传参
 * 执行 node ./xxx/index.js 111 222
 * 输出：
 * 0: C:\Program Files\nodejs\node.exe
 * 1: G:\GitHub\xxx\xxxx\index.js
 * 2: 111
 * 3: 222
 */
process.argv.forEach((val, index) => {
  console.log(`${index}: ${val}`);
});

/**
 * @des fs-extra 包实现
 * api参考: https://github.com/jprichardson/node-fs-extra
 */

function fsExtra() {
  async function copy() {
    try {
      await fsEx.copy(path.join(__dirname + '/p'), path.join(__dirname + '/d'))
      console.log('success');
    } catch (error) {
      console.log(error);
    }
  }

  copy()
}