Node.js 在不解压的情况下读取 zip 文件 [英] Node.js read a file in a zip without unzipping it

问题描述

我有一个 zip 文件(实际上它是一个 epub 文件)，我需要遍历其中的文件并读取它们，而无需将它们解压缩到磁盘.

I have a zip file (actually it's an epub file) I need to loop through the files in it and read them without unzipping them to the disk.

我尝试使用名为 JSZip 的 Node.js 库，但每个文件的内容都存储在内存中的 Buffer 中，每当我尝试将缓冲区内容解码为字符串时，返回的内容都是不可读的

I tried to use a Node.js library called JSZip but the content of each file is stored in memory in Buffer and whenever I try to decode the buffer content to string the content returned is unreadable

这是我试过的代码:

const zip = new JSZip();
  // read a zip file
    fs.readFile(epubFile, function (err, data) {
        if (err) throw err;
        zip.loadAsync(data).then(function (zip) {
            async.eachOf(zip.files, function (content, fileName, callback) {
                if (fileName.match(/json/)) {
                    var buf = content._data.compressedContent;
                    console.log(fileName);
                    console.log((new Buffer(buf)).toString('utf-8'));
                }
                callback();
            }, function (err) {
                if (err) {
                    console.log(err);
                }
            });
        });
    });

推荐答案

由于 unzip 好像被放弃了，所以我用了 node-stream-zip 非常成功.

Since unzip seems to be abandoned, I used node-stream-zip with pretty good success.

npm install node-stream-zip

读取文件都是这样的:

const StreamZip = require('node-stream-zip');
const zip = new StreamZip({
    file: 'archive.zip',
    storeEntries: true
});

zip.on('ready', () => {
    // Take a look at the files
    console.log('Entries read: ' + zip.entriesCount);
    for (const entry of Object.values(zip.entries())) {
        const desc = entry.isDirectory ? 'directory' : `${entry.size} bytes`;
        console.log(`Entry ${entry.name}: ${desc}`);
    }

    // Read a file in memory
    let zipDotTxtContents = zip.entryDataSync('path/inside/zip.txt').toString('utf8');
    console.log("The content of path/inside/zip.txt is: " + zipDotTxtContents);

    // Do not forget to close the file once you're done
    zip.close()
});

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