Initial data commit

Task/Echo-server/Java/echo-server.java

@@ -0,0 +1,42 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.io.PrintWriter;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+
+public class EchoServer {
+
+    public static void main(String[] args) throws IOException {
+        try (ServerSocket listener = new ServerSocket(12321)) {
+            while (true) {
+                Socket conn = listener.accept();
+                Thread clientThread = new Thread(() -> handleClient(conn));
+                clientThread.start();
+            }
+        }
+    }
+
+    private static void handleClient(Socket connArg) {
+        Charset utf8 = StandardCharsets.UTF_8;
+
+        try (Socket conn = connArg) {
+            BufferedReader in = new BufferedReader(
+                    new InputStreamReader(conn.getInputStream(), utf8));
+
+            PrintWriter out = new PrintWriter(
+                    new OutputStreamWriter(conn.getOutputStream(), utf8),
+                    true);
+
+            String line;
+            while ((line = in.readLine()) != null) {
+                out.println(line);
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}