nodejs中使用archive压缩文件的实现代码

前言

archive是一款在nodejs中可以实现跨平台打包的工具

可以将文件压缩为zip或rar格式

是一个比较好用的第三方模块

install

npm install archiver --save

archive github地址：

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');
//设置压缩格式为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();

实际使用

实际使用中情况可能会比较多

需要打包的源文件一般为远程文件，比如某一个第三方的文件存放地址，这时则需要先将第三方文件下载到本地

示例方法，可以根据实际需要修改相应的参数

function download(files){
  //下载文件的本地存档地址
  //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 + "]下载完毕");

        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||'')
  })
})
}

//创建文件夹目录
function mkdir(dirpath) {
  if (!fs.existssync(dirpath)) {
    fs.mkdirsync(dirpath);
    console.log("文件夹创建成功");
  } else {
    console.log("文件夹已存在");
  }
}

将下载到本地的文件打包为一个zip文件，可以参照 quick start 中的api组合使用

 // append files from a sub-directory, putting its contents at the root of archive
 archive.directory('subdir/', false);
 //要注意第二个参数false，这个参数代表打包后的文件相对于output的目录结构，不写这个参数代表按照第一个参数('subdir/')的目录层级

打包之后的文件位置是在本地位置，此时在推送到前端页面中下载url需要组装成http或https的地址

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。