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nodejs中使用archive壓縮文件的實現(xiàn)代碼

更新時間：2019年11月26日 08:27:22 作者：昀賽

這篇文章主要介紹了nodejs中使用archive壓縮文件的實現(xiàn)代碼，文中通過示例代碼介紹的非常詳細，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

前言

archive是一款在nodejs中可以實現(xiàn)跨平臺打包的工具

可以將文件壓縮為zip或rar格式

是一個比較好用的第三方模塊

install

npm install archiver --save

archive github地址：https://github.com/archiverjs/node-archiver

Quick Start

// require modules
var fs = require('fs');
var archiver = require('archiver');

// create a file to stream archive data to.
var output = fs.createWriteStream(__dirname + '/example.zip');
//設(shè)置壓縮格式為zip
var archive = archiver('zip', {
  zlib: { level: 9 } // Sets the compression level.
});

// listen for all archive data to be written
// 'close' event is fired only when a file descriptor is involved
output.on('close', function() {
  console.log(archive.pointer() + ' total bytes');
  console.log('archiver has been finalized and the output file descriptor has closed.');
});

// This event is fired when the data source is drained no matter what was the data source.
// It is not part of this library but rather from the NodeJS Stream API.
// @see:  https://nodejs.org/api/stream.html#stream_event_end
output.on('end', function() {
  console.log('Data has been drained');
});

// good practice to catch this error explicitly
archive.on('error', function(err) {
  throw err;
});
// pipe archive data to the file
archive.pipe(output);
// append a file from stream
var file1 = __dirname + '/file1.txt';
archive.append(fs.createReadStream(file1), { name: 'file1.txt' });

// append a file from string
archive.append('string cheese!', { name: 'file2.txt' });
// append a file from buffer
var buffer3 = Buffer.from('buff it!');
archive.append(buffer3, { name: 'file3.txt' });

// append a file
archive.file('file1.txt', { name: 'file4.txt' });

// append files from a sub-directory and naming it `new-subdir` within the archive
archive.directory('subdir/', 'new-subdir');

// append files from a sub-directory, putting its contents at the root of archive
archive.directory('subdir/', false);

// append files from a glob pattern
archive.glob('subdir/*.txt');

// finalize the archive (ie we are done appending files but streams have to finish yet)
// 'close', 'end' or 'finish' may be fired right after calling this method so register to them beforehand
archive.finalize();

實際使用

實際使用中情況可能會比較多

需要打包的源文件一般為遠程文件，比如某一個第三方的文件存放地址，這時則需要先將第三方文件下載到本地

示例方法，可以根據(jù)實際需要修改相應(yīng)的參數(shù)

function download(files){
  //下載文件的本地存檔地址
  //示例 files = [{name: 'xxxx.js',url:'https://xx/xx/xxxx.js'}]
  let dirPath = path.resolve(__dirname, '文件存放的本地位置')
  mkdir(dirPath);

  let tmps = files.map((item,index) => {
    let stream = fs.createWriteStream(path.resolve(dirPath, item.name));

  return new Promise((resolve,reject)=>{
    try {
      request(item.url).pipe(stream).on("close", function (err) {
        console.log("文件[" + item.name + "]下載完畢");

        resolve({
          url: path.resolve(dirPath, item.name),
          name: item.name
        })
      });
    } catch (e) {
      reject(e||'')
    }
  })
});

return new Promise((res,rej)=>{
  Promise.all(tmps).then((result) => {
    console.log(result)
    res(result)
  }).catch((error) => {
    console.log(error||'')
  })
})
}

//創(chuàng)建文件夾目錄
function mkdir(dirPath) {
  if (!fs.existsSync(dirPath)) {
    fs.mkdirSync(dirPath);
    console.log("文件夾創(chuàng)建成功");
  } else {
    console.log("文件夾已存在");
  }
}

將下載到本地的文件打包為一個zip文件，可以參照 Quick Start 中的api組合使用

 // append files from a sub-directory, putting its contents at the root of archive
 archive.directory('subdir/', false);
 //要注意第二個參數(shù)false，這個參數(shù)代表打包后的文件相對于output的目錄結(jié)構(gòu)，不寫這個參數(shù)代表按照第一個參數(shù)('subdir/')的目錄層級

打包之后的文件位置是在本地位置，此時在推送到前端頁面中下載url需要組裝成http或https的地址

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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