node.js - 检测 Node 中 writeStream 的结束

Question

这就是我所拥有的，我一直收到错误消息，因为当我按顺序执行时文件还不存在。

如何在 writeStream 关​​闭时触发操作？

var fs = require('fs'), http = require('http');
http.createServer(function(req){
    req.pipe(fs.createWriteStream('file'));


    /* i need to read the file back, like this or something: 
        var fcontents = fs.readFileSync(file);
        doSomethinWith(fcontents);
    ... the problem is that the file hasn't been created yet.
    */

}).listen(1337, '127.0.0.1');

Answer 1

可写流有 finish刷新数据时发出的事件。

试试下面的；

var fs = require('fs'), http = require('http');

http.createServer(function(req, res){
    var f = fs.createWriteStream('file');

    f.on('finish', function() {
        // do stuff
        res.writeHead(200);
        res.end('done');
    });

    req.pipe(f);
}).listen(1337, '127.0.0.1');

虽然我不会重新阅读文件。您可以使用through创建流处理器。