thinkjin99 · shon5544 · Mar 19, 2024 · Mar 19, 2024
diff --git a/assignment/network/http/simple_webserver/beomsu/Main.java b/assignment/network/http/simple_webserver/beomsu/Main.java
@@ -0,0 +1,11 @@
+import java.io.IOException;
+import java.net.ServerSocket;
+
+public class Main {
+
+	public static void main(String[] args) throws IOException {
+		Server server = new Server();
+
+		server.run();
+	}
+}
diff --git a/assignment/network/http/simple_webserver/beomsu/Server.java b/assignment/network/http/simple_webserver/beomsu/Server.java
@@ -0,0 +1,129 @@
+import java.io.*;
+import java.net.InetSocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.channels.SelectionKey;
+import java.nio.channels.Selector;
+import java.nio.channels.ServerSocketChannel;
+import java.nio.channels.SocketChannel;
+import java.util.*;
+
+public class Server {
+	private static final int BUFFER_SIZE = 1024;
+	private static final int PORT = 80;
+
+	private Selector selector;
+	private ByteBuffer buffer;
+
+	public Server() throws IOException {
+		selector = Selector.open();
+		buffer = ByteBuffer.allocate(BUFFER_SIZE);
+	}
+
+	public void run() throws IOException {
+		ServerSocketChannel serverChannel = ServerSocketChannel.open();
+		serverChannel.socket().bind(new InetSocketAddress(PORT));
+		serverChannel.configureBlocking(false);
+		System.out.println(PORT + "포트에 서버 소켓이 할당되었습니다.");
+
+		serverChannel.register(selector, SelectionKey.OP_ACCEPT);
+
+		while (true) {
+			int readyChannels = selector.select();
+			if (readyChannels == 0) {
+				continue;
+			}
+
+			Set<SelectionKey> selectedKeys = selector.selectedKeys();
+			Iterator<SelectionKey> keyIterator = selectedKeys.iterator();
+
+			while (keyIterator.hasNext()) {
+				SelectionKey key = keyIterator.next();
+
+				if (key.isAcceptable()) {
+					handleAccept(serverChannel);
+				} else if (key.isReadable()) {
+					handleRead(key);
+				}
+
+				keyIterator.remove();
+			}
+		}
+	}
+
+	private void handleAccept(ServerSocketChannel serverChannel) throws IOException {
+		SocketChannel clientChannel = serverChannel.accept();
+		clientChannel.configureBlocking(false);
+		clientChannel.register(selector, SelectionKey.OP_READ);
+	}
+
+	private void handleRead(SelectionKey key) throws IOException {
+		SocketChannel clientChannel = (SocketChannel) key.channel();
+
+		buffer.clear();
+		int bytesRead = clientChannel.read(buffer);
+
+		if (bytesRead == -1) {
+			clientChannel.close();
+			key.cancel();
+			return;
+		}
+
+		buffer.flip();
+		byte[] data = new byte[buffer.remaining()];
+		buffer.get(data);
+
+		String request = new String(data);
+		String[] requestLines = request.split("\n");
+		String[] tokenizedStartLine = requestLines[0].split(" ");
+
+		if (tokenizedStartLine[1].equals("/favicon.ico")) {
+			return;
+		}
+
+		String response = sendResponse(tokenizedStartLine[1]);
+		clientChannel.write(ByteBuffer.wrap(response.getBytes()));
+		clientChannel.close();
+	}
+
+	private String sendResponse(String endpoint) throws IOException {
+
+		StringBuilder fileContent = new StringBuilder();
+		addResponseHeader(fileContent);
+
+		if (endpoint.equals("/")) {
+			return generateResponse(fileContent, "/article1");
+		}
+
+		if (
+			endpoint.equals("/article2") ||
+			endpoint.equals("/article3")
+		) {
+			return generateResponse(fileContent, endpoint);
+		}
+
+		throw new IllegalArgumentException("요청받은 리소스는 존재하지 않습니다.");
+	}
+
+	private void addResponseHeader(StringBuilder fileContent) {
+		fileContent.append("""
+				HTTP/1.1 200 OK\r
+				Content-Type: text/html\r
+				\r
+				""");
+	}
+
+	private String generateResponse(StringBuilder fileContent, String endpoint) throws IOException {
+		BufferedReader reader = new BufferedReader(
+				new FileReader(String.format("src/resource%s.html", endpoint))
+		);
+
+		String line;
+		while ((line = reader.readLine()) != null) {
+			fileContent.append(line);
+		}
+
+		reader.close();
+
+		return fileContent.toString();
+	}
+}
diff --git a/assignment/network/http/simple_webserver/beomsu/resource/article1.html b/assignment/network/http/simple_webserver/beomsu/resource/article1.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>안녕하세요 나는 범수</title>
+</head>
+<body>
+<h1>안녕하세요 누구냐고 묻는다면 나는 범수</h1>
+<div>
+    <img style="width: 400px; height: 400px;" src="https://i.namu.wiki/i/uIt7OBpwNR2Cgk90eW_s_0iAZ6628xqGiRY1YyG5drpYaFwXo4ZAKKLltMDxLc2qPyky0s6D9bociJ770v2mwA.webp" />
+</div>
+<a href="https://github.com/shon5544">github 프로필. 이것은 내 것. 게시글 말고 내 프로필을 보세요.</a>
+<br>
+<a href="/article2">article2</a>
+<br>
+<a href="/article3">article3</a>
+</body>
+</html>
diff --git a/assignment/network/http/simple_webserver/beomsu/resource/article2.html b/assignment/network/http/simple_webserver/beomsu/resource/article2.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>안녕하세요 나는 범수</title>
+</head>
+<body>
+<h1>안녕하세요 누구냐고 묻는다면 나는 범수</h1>
+<div>
+    <img style="width: 400px; height: 400px;" src="https://i.namu.wiki/i/uIt7OBpwNR2Cgk90eW_s_0iAZ6628xqGiRY1YyG5drpYaFwXo4ZAKKLltMDxLc2qPyky0s6D9bociJ770v2mwA.webp" />
+</div>
+<a href="https://github.com/shon5544">여기는 아티클 2!! github 프로필. 이것은 내 것. 게시글 말고 내 프로필을 보세요.</a>
+</body>
+</html>
diff --git a/assignment/network/http/simple_webserver/beomsu/resource/article3.html b/assignment/network/http/simple_webserver/beomsu/resource/article3.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>안녕하세요 나는 범수</title>
+</head>
+<body>
+<h1>안녕하세요 누구냐고 묻는다면 나는 범수</h1>
+<div>
+    <img style="width: 400px; height: 400px;" src="https://i.namu.wiki/i/uIt7OBpwNR2Cgk90eW_s_0iAZ6628xqGiRY1YyG5drpYaFwXo4ZAKKLltMDxLc2qPyky0s6D9bociJ770v2mwA.webp" />
+</div>
+<a href="https://github.com/shon5544">여기는 아티클 3!! github 프로필. 이것은 내 것. 게시글 말고 내 프로필을 보세요.</a>
+</body>
+</html>