仮想マシンに楽して初期設定用のファイルを転送したいがためだけにWEBサーバを書きました。ただのSocket通信です。
ステータスはOKとNOT FOUNDしか実装してません。

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.util.Scanner;
import java.net.ServerSocket;
import java.net.Socket;
public class WebServer {
private static final String DOCUMENT_ROOT = System.getProperty("user.dir");
private static final int PORT = 8080;
private static boolean DEBUG;
public static void main(String args[]) {
DEBUG = Boolean.valueOf(System.getProperty("DEBUG", "false"));
try (ServerSocket server = new ServerSocket(PORT)) {
log("listening on port " + server.getLocalPort());
int threadCount = 0;
while (true) {
Socket client = server.accept();
ConnectionThread thread = new ConnectionThread(client, threadCount);
thread.start();
threadCount++;
}
} catch (IOException e) {
e.printStackTrace();
}
}
public static void log(String message) {
System.out.println(message);
}
static class ConnectionThread extends Thread {
private Socket client;
private int counter;
public ConnectionThread(Socket client, int counter) {
this.client = client;
this.counter = counter;
}
public void run() {
if (DEBUG) {
String clientIP = client.getInetAddress().toString();
int clientPort = client.getPort();
log("Connection " + counter + " : connected from " + clientIP +
" with port " + clientPort + ".");
}
try (InputStream input = client.getInputStream();
OutputStream output = client.getOutputStream()) {
String url = getRequestUrl(input);
if (url == null) {
return;
}
String responseFilePath = DOCUMENT_ROOT + url;
File file = new File(responseFilePath);
if (!file.exists()) {
sendNotFound(output);
return;
}
sendHeader(output);
sendFile(output, file);
} catch (IOException e) {
e.printStackTrace();
}
}
private String getRequestUrl(InputStream stream) {
Scanner reader = (new Scanner(stream)).useDelimiter("\n");
if (!reader.hasNext()) {
return null;
}
String line = reader.next();
String url = line.split(" ")[1];
if (DEBUG) {
while (reader.hasNext()) {
log(line);
line = reader.next();
}
}
return url;
}
private void sendNotFound(OutputStream output) {
PrintStream out = new PrintStream(output);
out.println("HTTP/1.0 404 Not Found");
out.println("");
out.println("NOT FOUND");
}
private void sendHeader(OutputStream output) {
PrintStream out = new PrintStream(output);
out.println("HTTP/1.0 200 OK");
out.println("MIME_version:1.0");
out.println("Content_Type:text/htm1");
out.println("");
}
private void sendFile(OutputStream output, File file) throws IOException{
try (DataInputStream in = new DataInputStream(new FileInputStream(file))) {
int len = (int)file.length();
byte buf[] = new byte[len];
in.readFully(buf);
output.write(buf, 0, len);
}
}
}
}
view raw SimpleWebServer.java hosted with ❤ by GitHub

※何故PythonでもRubyでもなくJavaで書いたかというと、Windowsにスクリプト言語環境を入れるのが面倒だったから。※こんなの、netcatを使えば1行なんですけどねぇ……