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：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');
//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
