如何使用Node JS读取上传到Google云存储的JSON文件的内容

问题描述：

我通过创建一个新项目将JSON文件手动上传到Google云存储.我能够读取文件的元数据，但是我不知道如何读取JSON内容.

I manually upload the JSON file to google cloud storage by creating a new project. I am able to read the metadata for a file but I don't know how to read the JSON content.

我用来读取元数据的代码是:

The code I used to read the metadata is:

var Storage = require('@google-cloud/storage');
const storage = Storage({
    keyFilename: 'service-account-file-path',
    projectId: 'project-id'
});
storage
    .bucket('project-name')
    .file('file-name')
    .getMetadata()
    .then(results => {
        console.log("results is", results[0])
    })
    .catch(err => {
        console.error('ERROR:', err);
    });

有人可以指导我阅读JSON文件内容的方法吗?

Can someone guide me to the way to read the JSON file content?

答

我使用以下代码从Cloud Storage中读取json文件:

I've used the following code to read a json file from Cloud Storage:

    'use strict';
    const Storage = require('@google-cloud/storage');
    const storage = Storage();
    exports.readFile = (req, res) => {
            console.log('Reading File');
            var archivo = storage.bucket('your-bucket').file('your-JSON-file').createReadStream();
            console.log('Concat Data');
            var  buf = '';
            archivo.on('data', function(d) {
              buf += d;
            }).on('end', function() {
              console.log(buf);
              console.log("End");
              res.send(buf);
            });     

    };

我正在从流中读取并将文件中的所有数据合并到buf变量.

I'm reading from a stream and concat all the data within the file to the buf variable.

希望有帮助.

更新

要读取多个文件，请执行以下操作:

To read multiple files:

'use strict';
const {Storage} = require('@google-cloud/storage');
const storage = new Storage();
listFiles();

async function listFiles() {
        const bucketName = 'your-bucket'
        console.log('Listing objects in a Bucket');
        const [files] = await storage.bucket(bucketName).getFiles();
        files.forEach(file => {
            console.log('Reading: '+file.name);
            var archivo = file.createReadStream();
            console.log('Concat Data');
            var  buf = '';
            archivo.on('data', function(d) {
                buf += d;
            }).on('end', function() {
                console.log(buf);
                console.log("End");
            });    
        });
};

如何使用Node JS读取上传到Google云存储的JSON文件的内容

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