Question

我需要连续的数据接收。但是我尝试了setinterval（）但没有成功。然后我尝试了setinterval（）也没有成功，我在发送消息后收到第一个响应，没有成功，请您帮帮我。这是输出； [在此处输入图像描述] [1]

var HOST = '202.71.103.XXX';
var PORT = XXXX;
var client = new net.Socket();
client.connect(PORT, HOST, function() {
    console.log('CONNECTED TO: ' + HOST + ':' + PORT);
    client.write('init');
    setInterval(getData, 1000);
});

function getData() {
    console.log('fun called')
    client.on('data', function(data) {
        console.log('Get Data: ' + data)
        Cdata = JSON.parse(data.slice(0, -2))
        if (Cdata.ServerDist == 1) {
            var sentMsg = '{"ClientID":"' + Cdata.ClientID + '","TrackSystemNos":"13992881XXX|"}';  
            client.write(sentMsg)
            console.log('Sent Msg: ' + sentMsg)
        }
    });
}


  [1]: https://i.stack.imgur.com/7Mt0Y.png

Answer 1

好的，所以我不是100％知道您的特定问题是什么，但是我根据您的代码编写了一个简单的客户端和服务器，它工作得很好，所以看看是否有帮助。

服务器：

const net = require('net');

var dummy = {
    ServerDist: 1
};

var server = net.createServer(function(socket) {
    let temp = JSON.stringify(dummy)
    console.log(temp);
    socket.write(temp);
    socket.on('data', data => {
        let temp = JSON.stringify(dummy);
        console.log(temp);
        socket.write(temp);
    });
});

server.listen(1337, '127.0.0.1');

客户

var net = require('net');

var HOST = '127.0.0.1';
var PORT = 1337;
var client = new net.Socket();
client.connect(PORT, HOST, function () {
    console.log('CONNECTED TO: ' + HOST + ':' + PORT);
    client.write('init');
});

client.on('data', function (data) {
        console.log('Get Data: ' + data);
        let Cdata = JSON.parse(data);
        if (Cdata.ServerDist === 1) {
            let sentMsg = {ClientID: 'Bob', TrackSystemNos: '13992881XXX'};
            client.write(JSON.stringify(sentMsg));
            console.log('Sent Msg: ' + JSON.stringify(sentMsg))
        }
    }
);

输出：

Get Data: {"ServerDist":1}
Sent Msg: {"ClientID":"Bob","TrackSystemNos":"13992881XXX"}
Get Data: {"ServerDist":1}
Sent Msg: {"ClientID":"Bob","TrackSystemNos":"13992881XXX"}
Get Data: {"ServerDist":1}
Sent Msg: {"ClientID":"Bob","TrackSystemNos":"13992881XXX"}
Get Data: {"ServerDist":1}
Sent Msg: {"ClientID":"Bob","TrackSystemNos":"13992881XXX"}
Get Data: {"ServerDist":1}
Sent Msg: {"ClientID":"Bob","TrackSystemNos":"13992881XXX"}
Get Data: {"ServerDist":1}
Sent Msg: {"ClientID":"Bob","TrackSystemNos":"13992881XXX"}
Get Data: {"ServerDist":1}
Sent Msg: {"ClientID":"Bob","TrackSystemNos":"13992881XXX"}

旧答案 我相信您的问题是setinterval是异步调用。因此，只要您调用它，代码就会从connect函数中继续出来（很可能会终止连接）。 setinterval之所以会获得第一个响应，是因为它在关闭之前就已存在于调用中，但由于连接已关闭，因此不再有响应。

您是否尝试过在连接内部使用while循环以保持连接打开？

节点Js TCP客户端未在循环中接收数据

1 个答案: