Kotlin JVM: Simple Server of 1 Script File

Table of Contents

Kotlin can be used as script. I tried to create simple server with Kotlin script, like the server introduced in Python Light Server.

Preparation

Install Kotlin compiler.

macOS case

If you use homebrew, you can install Kotlin (kotlinc) with brew install kotlin. In my case, it was installed as /usr/local/Cellar/kotlin/1.2.71/bin/kotlinc.

Code

It is a socket connection code with java.net.ServerSocket. The code is in GitHub: Kotlin-Simple-HTTP-Server, too.

import java.io.*
import java.net.ServerSocket
val port = 8081;
val serverSocket = ServerSocket(port);
println("listening port: " + port.toString());
lateinit var requestLine: String
while (true) {
val clientSocket = serverSocket.accept();
val `in` = BufferedReader(InputStreamReader(clientSocket.getInputStream()));
val out = BufferedWriter(OutputStreamWriter(clientSocket.getOutputStream()));
do {
requestLine = `in`.readLine()
println(requestLine);
} while (!requestLine.isNullOrEmpty())
val body = """
<!DOCTYPE html><html><head><title>Exemple</title></head><body><p>Server exemple.</p></body></html>
""".trimIndent()
out.write("HTTP/1.0 200 OKrn");
out.write("Date: Fri, 31 Dec 2017 23:59:59 GMTrn");
out.write("Server: Apache/0.8.4rn");
out.write("Content-Type: text/htmlrn");
out.write("Content-Length: ${body.toByteArray().size}rn");
out.write("Expires: Sat, 01 Jan 2020 00:59:59 GMTrn");
out.write("Last-modified: Fri, 09 Aug 1996 14:21:40 GMTrn");
out.write("rn");
out.write(body)
out.close();
`in`.close();
clientSocket.close();
}

import java.io.*

import java.net.ServerSocket

val port = 8081;

val serverSocket = ServerSocket(port);

println("listening port: " + port.toString());

lateinit var requestLine: String

while (true) {

val clientSocket = serverSocket.accept();

val `in` = BufferedReader(InputStreamReader(clientSocket.getInputStream()));

val out = BufferedWriter(OutputStreamWriter(clientSocket.getOutputStream()));

do {

requestLine = `in`.readLine()

println(requestLine);

} while (!requestLine.isNullOrEmpty())

val body = """

<!DOCTYPE html><html><head><title>Exemple</title></head><body><p>Server exemple.</p></body></html>

""".trimIndent()

out.write("HTTP/1.0 200 OKrn");

out.write("Date: Fri, 31 Dec 2017 23:59:59 GMTrn");

out.write("Server: Apache/0.8.4rn");

out.write("Content-Type: text/htmlrn");

out.write("Content-Length: ${body.toByteArray().size}rn");

out.write("Expires: Sat, 01 Jan 2020 00:59:59 GMTrn");

out.write("Last-modified: Fri, 09 Aug 1996 14:21:40 GMTrn");

out.write("rn");

out.write(body)

out.close();

`in`.close();

clientSocket.close();

}

Launch Server

Launch server with the following command.

kotlinc -script server.kts

1	kotlinc -script server.kts

When you access to localhost:8081, you can see the page.

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