var zlib = require("zlib");
var input = '...............text...............';
zlib.deflate(input, function(err, buffer) {
  if (!err) {
    console.log("deflate (%s): ", buffer.length, buffer.toString('base64'));
    zlib.inflate(buffer, function(err, buffer) {
      if (!err) {
        console.log("inflate (%s): ", buffer.length, buffer.toString());
      }
    });
    zlib.unzip(buffer, function(err, buffer) {
      if (!err) {
        console.log("unzip deflate (%s): ", buffer.length, buffer.toString());
      }
    });
  }
});

zlib.deflateRaw(input, function(err, buffer) {
  if (!err) {
    console.log("deflateRaw (%s): ", buffer.length, buffer.toString('base64'));
    zlib.inflateRaw(buffer, function(err, buffer) {
      if (!err) {
        console.log("inflateRaw (%s): ", buffer.length, buffer.toString());
      }
    });
  }
});

zlib.gzip(input, function(err, buffer) {
  if (!err) {
    console.log("gzip (%s): ", buffer.length, buffer.toString('base64'));
    zlib.gunzip(buffer, function(err, buffer) {
      if (!err) {
        console.log("gunzip (%s): ", buffer.length, buffer.toString());
      }
    });
    zlib.unzip(buffer, function(err, buffer) {
      if (!err) {
        console.log("unzip gzip (%s): ", buffer.length, buffer.toString());
      }
    });
  }
});

輸出結(jié)果：

"C:\Program Files (x86)\JetBrains\WebStorm 11.0.3\bin\runnerw.exe" F:\nodejs\node.exe zlib_buffers.js
deflate (18): eJzT00MBJakVJagiegB9Zgcq
deflateRaw (12): 09NDASWpFSWoInoA
gzip (30): H4sIAAAAAAAAC9PTQwElqRUlqCJ6AIq+x+AiAAAA
inflate (34): ...............text...............
unzip deflate (34): ...............text...............
inflateRaw (34): ...............text...............
gunzip (34): ...............text...............
unzip gzip (34): ...............text...............

Process finished with exit code 0

二、壓縮文件

可通過pipe()將壓縮/解壓對象從一個流輸送到另一個流。

var zlib = require("zlib");
var gzip = zlib.createGzip();
var fs = require('fs');
var inFile = fs.createReadStream('zlib_file.js');
var outFile = fs.createWriteStream('zlib_file.gz');
inFile.pipe(gzip).pipe(outFile);
setTimeout(function(){
  var gunzip = zlib.createUnzip({flush: zlib.Z_FULL_FLUSH});
  var inFile = fs.createReadStream('zlib_file.gz');
  var outFile = fs.createWriteStream('zlib_file.unzipped');
  inFile.pipe(gunzip).pipe(outFile);
}, 3000);

上面代碼中前面是readable流通過pipe使用壓縮zlib.createGzip()然后輸出到writeable中。后面的是解壓的過程。

到此這篇關(guān)于Node.js實(shí)現(xiàn)壓縮與解壓數(shù)據(jù)的文章就介紹到這了。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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