java.net.ConnectException：无法连接到/192.168.253.3（端口2468）：连接失败：ECONNREFUSED（连接被拒绝） [英] java.net.ConnectException: failed to connect to /192.168.253.3 (port 2468): connect failed: ECONNREFUSED (Connection refused)

问题描述

我要转移个人电脑和手机有WIFI之间的一些数据，但我得到了java.net.ConnectException：无法连接到/192.168.253.3（端口2468）：连接失败：ECONNREFUSED（连接被拒绝）当我运行我的Andr​​oid项目。

I want to transfer some data between PC and a mobile phone with wifi, but I got "java.net.ConnectException: failed to connect to /192.168.253.3 (port 2468): connect failed: ECONNREFUSED (Connection refused)" when I run my android project.

这是我得到的WiFi IP地址：

This is how I get the wifi ip address:

String ip  = String.format(
                    "%d.%d.%d.%d",
                    (wifiInfo.getIpAddress() & 0xff),
                    (wifiInfo.getIpAddress() >> 8 & 0xff),
                    (wifiInfo.getIpAddress() >> 16 & 0xff),
                    (wifiInfo.getIpAddress() >> 24 & 0xff));

new Recive().execute(ip);

这是有关将消息发送到PC code：

This is the code about sending a message to the PC:

Socket socket = null;
String message = "test\r\n";
protected Void doInBackground(String... urls) {
    try {
        Log.i("ip", urls[0]);
        socket = new Socket(urls[0], 2468);
        toserver = new DataOutputStream(socket.getOutputStream());
        toserver.writeBytes(message);

        toserver.flush();
        toserver.close();
        socket.close();
        return null;
    } catch (Exception e) {
        Log.i("e", e.toString());
        return null;
    }
}

但出现错误，

java.net.ConnectException: failed to connect to /192.168.253.3 (port 2468): connect failed: ECONNREFUSED (Connection refused)

另外，我使用的是Android手机上运行的应用程序。

Besides, I use a android phone to run the app.

推荐答案

一个连接失败：ECONNREFUSED（连接被拒绝）很可能意味着，没有什么监听端口和IP地址。可能的解释包括：

A "connect failed: ECONNREFUSED (Connection refused)" most likely means that there is nothing listening on that port AND that IP address. Possible explanations include:

• 服务已经崩溃或尚未开始，


• 您的客户尝试使用了错误的IP地址或端口，连接或


• 服务器的访问被防火墙阻止那就是拒绝接受代服务器/服务的。这是pretty不太可能，因为正常的做法（这几天）是防火墙黑洞的所有不必要的连接尝试。

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