[英]Connection refused when connecting to localhost's port 9999
I am trying to understand some example Kotlin code that connects to http://127.0.0.1
using sockets, and I have IIS enabled and running it on 127.0.0.1.我正在尝试理解一些示例 Kotlin 使用 sockets 连接到
http://127.0.0.1
的代码,并且我启用了 IIS 并在 127.0.0.1 上运行它。 However, when I run the code, I get:但是,当我运行代码时,我得到:
"C:\Program Files\Microsoft\jdk-11.0.12.7-hotspot\bin\java.exe" -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:52769,suspend=y,server=n -javaagent:C:/Users/ivlat/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-coroutines-core-jvm/1.5.0/d8cebccdcddd029022aa8646a5a953ff88b13ac8/kotlinx-coroutines-core-jvm-1.5.0.jar -javaagent:C:\Users\ivlat\AppData\Local\JetBrains\IdeaIC2022.2\captureAgent\debugger-agent.jar=file:/C:/Users/ivlat/AppData/Local/Temp/capture.props -Dfile.encoding=UTF-8 -classpath "C:\Dev\KotlinProjects\7_08_Echo\client\build\classes\kotlin\main;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlin\kotlin-stdlib-jdk8\1.5.21\6b3de2a43405a65502728047db37a98a0c7e72f0\kotlin-stdlib-jdk8-1.5.21.jar;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\ch.qos.logback\logback-classic\1.2.3\7c4f3c474fb2c041d8028740440937705ebb473a\logback-classic-1.2.3.jar;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\ch.qos.logback\logback-core\1.2.3\864344400c3d4d92dfeb0a305dc87d953677c03c\logback-core-1.2.3.jar;C:\Dev\KotlinProjects\7_08_Echo\shared\build\classes\kotlin\main;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlinx\kotlinx-coroutines-core-jvm\1.5.0\d8cebccdcddd029022aa8646a5a953ff88b13ac8\kotlinx-coroutines-core-jvm-1.5.0.jar;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlin\kotlin-stdlib-jdk7\1.5.21\f059658740a4b3a3461aba9681457615332bae1c\kotlin-stdlib-jdk7-1.5.21.jar;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlin\kotlin-stdlib\1.5.21\2f537cad7e9eeb9da73738c8812e1e4cf9b62e4e\kotlin-stdlib-1.5.21.jar;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\org.slf4j\slf4j-api\1.7.25\da76ca59f6a57ee3102f8f9bd9cee742973efa8a\slf4j-api-1.7.25.jar;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\org.jetbrains.kotlin\kotlin-stdlib-common\1.5.21\cc8bf3586fd2ebcf234058b9440bb406e62dfacb\kotlin-stdlib-common-1.5.21.jar;C:\Users\ivlat\.gradle\caches\modules-2\files-2.1\org.jetbrains\annotations\13.0\919f0dfe192fb4e063e7dacadee7f8bb9a2672a9\annotations-13.0.jar;C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2022.2.3\lib\idea_rt.jar" com.knowledgespike.client.ApplicationKt
Connected to the target VM, address: '127.0.0.1:52769', transport: 'socket'
Exception in thread "main" java.io.IOException: The remote computer refused the network connection.
at java.base/sun.nio.ch.Iocp.translateErrorToIOException(Iocp.java:299)
at java.base/sun.nio.ch.Iocp$EventHandlerTask.run(Iocp.java:389)
at java.base/sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
Disconnected from the target VM, address: '127.0.0.1:52769', transport: 'socket'
Process finished with exit code 1
Apparently, my IIS isn't really set up for the port 9999, as I am getting the error below when I type localhost/127.0.0.1:9999
显然,我的 IIS 并没有真正设置端口 9999,因为当我键入
localhost/127.0.0.1:9999
时出现以下错误
HTTP Error 404.0 - Not Found
The resource you are looking for has been removed, had its name changed, or is temporarily unavailable.
The connection string that the Kotlin code is also using is localhost/127.0.0.1:9999
Kotlin 代码也使用的连接字符串是
localhost/127.0.0.1:9999
How would I go about getting the IIS recognize this request/let it through?我 go 如何让 IIS 识别这个请求/让它通过? It really doesn't even have to be IIS. I just want to understand this sample code better, and any sort of sandbox/test web server that allows for this request would more than suffice at this point.
它甚至不必是 IIS。我只是想更好地理解此示例代码,此时允许此请求的任何类型的沙箱/测试 web 服务器都绰绰有余。
This is the Kotlin code that's throwing the exception when trying to connect:这是在尝试连接时抛出异常的 Kotlin 代码:
fun main() = runBlocking {
val client: AsynchronousSocketChannel = AsynchronousSocketChannel.open()
val hostAddress = InetSocketAddress("localhost", PORT)
val tcpSocket = TcpSocket(client)
tcpSocket.connect(hostAddress)
val br = BufferedReader(InputStreamReader(System.`in`))
var line: String
println("Main name is: \t\t\t\t\t${Thread.currentThread().name}")
println("Message to server:")
while (br.readLine().also { line = it } != null) {
val result = async {
println("while:async name is: \t\t\t${Thread.currentThread().name}")
sendMessage(tcpSocket, line)
}
println("while: name is: \t\t\t\t${Thread.currentThread().name}")
if (line == "bye") {
println("End")
break
}
val response: String = result.await()
withContext(Dispatchers.Default) {
println("withContext[Default] name is: \t${Thread.currentThread().name}")
println("response from server: $response")
println("Message to server:")
}
}
}
I was able to circumvent the error by going to bindings for the default web site in the IIS Manager UI and then adding the port 9999. The Kotlin code connects fine now.通过转到 IIS 管理器 UI 中的默认 web 站点的绑定,然后添加端口 9999,我能够规避该错误。Kotlin 代码现在连接正常。 I'm pretty sure there are better ways of solving this IRL, but I think it's good enough, as I am just learning Kotlin at this point.
我很确定有更好的方法来解决这个 IRL,但我认为这已经足够了,因为我现在正在学习 Kotlin。
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