complete project

pom.xml

@@ -28,6 +28,34 @@
             <artifactId>jstl</artifactId>
             <version>1.2</version>
         </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>5.10.2</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-params</artifactId>
+            <version>5.10.2</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-junit-jupiter</artifactId>
+            <version>5.12.0</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-core</artifactId>
+            <version>2.20.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-api</artifactId>
+            <version>2.20.0</version>
+        </dependency>
     </dependencies>
 
     <build>

src/main/java/com/tictactoe/Field.java

@@ -52,7 +52,8 @@ public Sign checkWin() {
         );
 
         for (List<Integer> winPossibility : winPossibilities) {
-            if (field.get(winPossibility.get(0)) == field.get(winPossibility.get(1))
+            if (field.get(winPossibility.get(0)) != Sign.EMPTY
+                && field.get(winPossibility.get(0)) == field.get(winPossibility.get(1))
                 && field.get(winPossibility.get(0)) == field.get(winPossibility.get(2))) {
                 return field.get(winPossibility.get(0));
             }

src/main/java/com/tictactoe/InitServlet.java

@@ -0,0 +1,33 @@
+package com.tictactoe;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpSession;
+import java.io.IOException;
+import java.util.List;
+
+@WebServlet(name = "InitServlet", value = "/start")
+public class InitServlet extends HttpServlet {
+    private static final Logger LOGGER = LogManager.getLogger(InitServlet.class);
+
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        HttpSession currentSession = req.getSession(true);
+
+        Field field = new Field();
+
+        List<Sign> data = field.getFieldData();
+
+        currentSession.setAttribute("field", field);
+        currentSession.setAttribute("data", data);
+
+        LOGGER.info("Game started, field initialized");
+        getServletContext().getRequestDispatcher("/index.jsp").forward(req, resp);
+    }
+}

src/main/java/com/tictactoe/LogicServlet.java

@@ -0,0 +1,97 @@
+package com.tictactoe;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import javax.servlet.RequestDispatcher;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpSession;
+import java.io.IOException;
+import java.util.List;
+
+@WebServlet(name = "LogicServlet", value = "/logic")
+public class LogicServlet extends HttpServlet {
+    private static final Logger LOGGER = LogManager.getLogger(LogicServlet.class);
+
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        HttpSession currentSession = req.getSession(true);
+        Field field = extractField(currentSession);
+
+        int index = getSelectedIndex(req);
+        Sign currentSign = field.getField().get(index);
+
+        if (Sign.EMPTY != currentSign) {
+            LOGGER.debug("Clicked on not EMPTY sign");
+            RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/index.jsp");
+            dispatcher.forward(req, resp);
+            return;
+        }
+
+        field.getField().put(index, Sign.CROSS);
+        if (checkWin(resp, currentSession, field)) {
+            LOGGER.info("Game ended");
+            LOGGER.debug("Player won");
+            return;
+        }
+
+        int emptyFieldIndex = field.getEmptyFieldIndex();
+        if (emptyFieldIndex >= 0) {
+            field.getField().put(emptyFieldIndex, Sign.NOUGHT);
+            if (checkWin(resp, currentSession, field)) {
+                LOGGER.info("Game ended");
+                LOGGER.debug("Computer won");
+                return;
+            }
+        } else {
+            currentSession.setAttribute("draw", true);
+
+            List<Sign> data = field.getFieldData();
+
+            currentSession.setAttribute("data", data);
+            resp.sendRedirect("/index.jsp");
+            return;
+        }
+
+        List<Sign> data = field.getFieldData();
+
+        currentSession.setAttribute("data", data);
+        currentSession.setAttribute("field", field);
+
+        resp.sendRedirect("/index.jsp");
+    }
+
+    private Field extractField(HttpSession currentSession) {
+        Object fieldAttribute = currentSession.getAttribute("field");
+        if (fieldAttribute.getClass() != Field.class) {
+            currentSession.invalidate();
+            LOGGER.error("Session is broken");
+            throw new RuntimeException("Session is broken, try one more time");
+        }
+        return (Field) fieldAttribute;
+    }
+
+    private int getSelectedIndex(HttpServletRequest request) {
+        String click = request.getParameter("click");
+        boolean isNumeric = click.chars().allMatch(Character::isDigit);
+        return isNumeric ? Integer.parseInt(click) : 0;
+    }
+
+    private boolean checkWin(HttpServletResponse response, HttpSession currentSession, Field field) throws IOException {
+        Sign winner = field.checkWin();
+        if (Sign.CROSS == winner || Sign.NOUGHT == winner) {
+            currentSession.setAttribute("winner", winner);
+
+            List<Sign> data = field.getFieldData();
+
+            currentSession.setAttribute("data", data);
+            response.sendRedirect("/index.jsp");
+            return true;
+        }
+        return false;
+    }
+}

src/main/java/com/tictactoe/RestartServlet.java

@@ -0,0 +1,22 @@
+package com.tictactoe;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+@WebServlet(name = "RestartServlet", value = "/restart")
+public class RestartServlet extends HttpServlet {
+    private static final Logger LOGGER = LogManager.getLogger(RestartServlet.class);
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {
+        req.getSession().invalidate();
+        resp.sendRedirect("/start");
+        LOGGER.info("Game restarted");
+    }
+}

src/main/resources/log4j2.xml

@@ -0,0 +1,23 @@
+<Configuration status="WARN">
+    <Properties>
+        <Property name="LOG_PATTERN">%date %level %logger{10} [%file:%line] %msg%n</Property>
+        <Property name="APP_LOG_ROOT">C:/Main/project-servlet</Property>
+    </Properties>
+
+    <Appenders>
+        <RollingFile name="FILE" fileName="${APP_LOG_ROOT}/tic-tac-toe.log"
+                     filePattern="${APP_LOG_ROOT}/tic-tac-toe-%d{yyyy-MM-dd}-%i.log">
+            <PatternLayout pattern="${LOG_PATTERN}"/>
+            <Policies>
+                <SizeBasedTriggeringPolicy size="19500KB" />
+            </Policies>
+            <DefaultRolloverStrategy max="10"/>
+        </RollingFile>
+    </Appenders>
+
+    <Loggers>
+        <Root level="ALL">
+            <AppenderRef ref="FILE"/>
+        </Root>
+    </Loggers>
+</Configuration>

src/main/webapp/index.jsp

@@ -1,17 +1,61 @@
+<%@ page import="com.tictactoe.Sign" %>
 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
 
 <!DOCTYPE html>
 <html>
 <head>
+    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+    <script src="<c:url value="/static/jquery-3.6.0.min.js"/>"></script>
+    <link href="static/main.css" rel="stylesheet">
     <title>Tic-Tac-Toe</title>
 </head>
 <body>
-<h1>Tic-Tac-Toe</h1>
+    <h1>Tic-Tac-Toe</h1>
+    <table>
+        <tr>
+            <td onclick="window.location='/logic?click=0'">${data.get(0).getSign()}</td>
+            <td onclick="window.location='/logic?click=1'">${data.get(1).getSign()}</td>
+            <td onclick="window.location='/logic?click=2'">${data.get(2).getSign()}</td>
+        </tr>
+        <tr>
+            <td onclick="window.location='/logic?click=3'">${data.get(3).getSign()}</td>
+            <td onclick="window.location='/logic?click=4'">${data.get(4).getSign()}</td>
+            <td onclick="window.location='/logic?click=5'">${data.get(5).getSign()}</td>
+        </tr>
+        <tr>
+            <td onclick="window.location='/logic?click=6'">${data.get(6).getSign()}</td>
+            <td onclick="window.location='/logic?click=7'">${data.get(7).getSign()}</td>
+            <td onclick="window.location='/logic?click=8'">${data.get(8).getSign()}</td>
+        </tr>
+    </table>
+    <c:set var="CROSSES" value="<%=Sign.CROSS%>"/>
+    <c:set var="NOUGHTS" value="<%=Sign.NOUGHT%>"/>
 
-
-<script>
-
-</script>
+    <c:if test="${winner == CROSSES}">
+        <h1>CROSSES WIN!</h1>
+        <button onclick="restart()">Start again</button>
+    </c:if>
+    <c:if test="${winner == NOUGHTS}">
+        <h1>NOUGHTS WIN!</h1>
+        <button onclick="restart()">Start again</button>
+    </c:if>
+    <c:if test="${draw}">
+        <h1>IT'S A DRAW</h1>
+        <button onclick="restart()">Start again</button>
+    </c:if>
+    <script>
+        function restart() {
+            $.ajax({
+                url: '/restart',
+                type: 'POST',
+                contentType: 'application/json;charset=UTF-8',
+                async: false,
+                success: function () {
+                    location.reload();
+                }
+            });
+        }
+    </script>
 
 </body>
 </html>

src/main/webapp/static/main.css

@@ -0,0 +1,22 @@
+td {
+    border: 3px solid black;
+    padding: 10px;
+    border-collapse: separate;
+    margin: 10px;
+    width: 100px;
+    height: 100px;
+    font-size: 50px;
+    text-align: center;
+    empty-cells: show;
+}
+
+
+body {
+    text-align: center;
+}
+
+table {
+    position: relative;
+    left: 50%;
+    transform: translateX(-50%);
+}