我一直在尝试在使用Node.js时写入文件,但没有成功。我该怎么做?
当前回答
var path = 'public/uploads/file.txt',
buffer = new Buffer("some content\n");
fs.open(path, 'w', function(err, fd) {
if (err) {
throw 'error opening file: ' + err;
}
fs.write(fd, buffer, 0, buffer.length, null, function(err) {
if (err) throw 'error writing file: ' + err;
fs.close(fd, function() {
console.log('file written');
})
});
});
其他回答
文件系统API中有很多细节。最常见的方法是:
const fs = require('fs');
fs.writeFile("/tmp/test", "Hey there!", function(err) {
if(err) {
return console.log(err);
}
console.log("The file was saved!");
});
// Or
fs.writeFileSync('/tmp/test-sync', 'Hey there!');
提供的答案已注明日期,更新的方法是:
const fsPromises = require('fs').promises
await fsPromises.writeFile('/path/to/file.txt', 'data to write')
有关详细信息,请参阅此处的文档
您可以通过以下代码示例写入文件:
var data = [{ 'test': '123', 'test2': 'Lorem Ipsem ' }];
fs.open(datapath + '/data/topplayers.json', 'wx', function (error, fileDescriptor) {
if (!error && fileDescriptor) {
var stringData = JSON.stringify(data);
fs.writeFile(fileDescriptor, stringData, function (error) {
if (!error) {
fs.close(fileDescriptor, function (error) {
if (!error) {
callback(false);
} else {
callback('Error in close file');
}
});
} else {
callback('Error in writing file.');
}
});
}
});
您可以使用fs(文件系统)模块写入文件。
以下是您可以如何做到的示例:
const fs = require('fs');
const writeToFile = (fileName, callback) => {
fs.open(fileName, 'wx', (error, fileDescriptor) => {
if (!error && fileDescriptor) {
// Do something with the file here ...
fs.writeFile(fileDescriptor, newData, (error) => {
if (!error) {
fs.close(fileDescriptor, (error) => {
if (!error) {
callback(false);
} else {
callback('Error closing the file');
}
});
} else {
callback('Error writing to new file');
}
});
} else {
callback('Could not create new file, it may already exists');
}
});
};
您可能还希望通过使用Promise和async/await语句来消除回调代码结构中的回调。这将使异步代码结构更加平坦。为此,可以使用一个方便的util.provify(原始)函数。它使我们能够从回调转向承诺。看看下面的fs函数示例:
// Dependencies.
const util = require('util');
const fs = require('fs');
// Promisify "error-back" functions.
const fsOpen = util.promisify(fs.open);
const fsWrite = util.promisify(fs.writeFile);
const fsClose = util.promisify(fs.close);
// Now we may create 'async' function with 'await's.
async function doSomethingWithFile(fileName) {
const fileDescriptor = await fsOpen(fileName, 'wx');
// Do something with the file here...
await fsWrite(fileDescriptor, newData);
await fsClose(fileDescriptor);
}
同步写入
fs.writeFileSync(文件,数据[,选项])
fs = require('fs');
fs.writeFileSync("foo.txt", "bar");
异步写入
fs.writeFile(文件,数据[,选项],回调)
fs = require('fs');
fs.writeFile('foo.txt', 'bar', (err) => { if (err) throw err; });
哪里
file <string> | <Buffer> | <URL> | <integer> filename or file descriptor
data <string> | <Buffer> | <Uint8Array>
options <Object> | <string>
callback <Function>
值得阅读官方文件系统(fs)文档。
更新:async/await
fs = require('fs');
util = require('util');
writeFile = util.promisify(fs.writeFile);
fn = async () => { await writeFile('foo.txt', 'bar'); }
fn()