hw4

build.gradle

@@ -1,6 +1,7 @@
 plugins {
     id 'war'
     id 'org.gretty' version '2.2.0'
+    id 'io.franzbecker.gradle-lombok' version '1.14'
 }
 
 repositories {
@@ -11,9 +12,25 @@ repositories {
 sourceCompatibility = 10
 
 dependencies {
+    // https://mvnrepository.com/artifact/org.hsqldb/hsqldb
+    compile group: 'org.hsqldb', name: 'hsqldb', version: '2.4.1'
+
+    // https://mvnrepository.com/artifact/org.apache.commons/commons-dbcp2
+    compile group: 'org.apache.commons', name: 'commons-dbcp2', version: '2.5.0'
+
+    // https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind
+    compile group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.9.7'
+
+    compile 'com.fasterxml.jackson.core:jackson-databind:2.9.6'
+
     compileOnly 'javax.servlet:javax.servlet-api:4.0.1'
 }
 
 gretty {
     contextPath = '/'
 }
+
+lombok {
+    version = '1.18.2'
+    sha256 = ""
+}

src/main/java/DAO/OrdersDao.java

@@ -0,0 +1,81 @@
+package DAO;
+
+import DTO.Order;
+import util.DataSourceProvider;
+
+import java.sql.*;
+import java.util.ArrayList;
+import java.util.List;
+
+public class OrdersDao {
+
+    static private int nextOrderId = 0;
+
+    public static Order getOrderForId(int id) {
+        Order order = new Order();
+        String sql = "select 'order_number' from ORDERS where id=?;";
+        try (Connection connection = DataSourceProvider.getDataSource().getConnection();
+             PreparedStatement ps = connection.prepareStatement(sql)) {
+            ps.setInt(1, id);
+            try (ResultSet rs = ps.executeQuery()) {
+                if (rs.next()) {
+                    order.setId(id);
+                    order.setOrderNumber(rs.getString("order_number"));
+                    return order;
+                }
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return null;
+    }
+    public static List<Order> getAllOrders() {
+        List<Order> orders = new ArrayList<Order>();
+        String sql = "select id, order_number from orders;";
+        try (Connection connection = DataSourceProvider.getDataSource().getConnection();
+             Statement statement = connection.createStatement() ){
+
+            try (ResultSet rs = statement.executeQuery(sql)) {
+                while(rs.next()) {
+                    Order order = new Order();
+                    order.setId(rs.getInt(1));
+                    order.setOrderNumber(rs.getString(2));
+                    orders.add(order);
+                }
+            }
+
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+
+        return orders;
+    }
+
+    public static void saveOrder(Order order) {
+        order.setId(nextOrderId++);
+        String sql = "insert into orders (id, order_number) values (?, ?);";
+        try (Connection connection = DataSourceProvider.getDataSource().getConnection();
+             PreparedStatement ps = connection.prepareStatement(sql)) {
+            ps.setInt(1, order.getId());
+            ps.setString(2, order.getOrderNumber());
+            ps.execute();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static int getCount() {
+        String sql = "select count(*) from orders;";
+        try (Connection connection = DataSourceProvider.getDataSource().getConnection();
+             Statement ps = connection.createStatement()) {
+            try (ResultSet rs = ps.executeQuery(sql)) {
+                if (rs.next()) {
+                    return rs.getInt(1);
+                }
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return 0;
+    }
+}

src/main/java/DTO/Order.java

@@ -0,0 +1,10 @@
+package DTO;
+import lombok.Data;
+
+import java.util.List;
+
+public @Data class Order {
+    private int id;
+    private String orderNumber;
+    private List<OrderItem> orderRows;
+}

src/main/java/DTO/OrderItem.java

@@ -0,0 +1,9 @@
+package DTO;
+
+import lombok.Data;
+
+public @Data class OrderItem {
+    private String itemName;
+    private Integer quantity;
+    private Integer price;
+}

src/main/java/Startup.java

@@ -0,0 +1,39 @@
+import util.DataSourceProvider;
+
+import javax.servlet.ServletContextEvent;
+import javax.servlet.ServletContextListener;
+import javax.servlet.annotation.WebListener;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+import static util.FileUtil.readFileFromClasspath;
+
+@WebListener
+public class Startup implements ServletContextListener {
+
+    @Override
+    public void contextInitialized(ServletContextEvent sce) {
+        System.out.println("Set jdbc provider url");
+        DataSourceProvider.setDbUrl("jdbc:hsqldb:mem:shop.");
+
+        System.out.println("Load sql");
+        String sql = readFileFromClasspath("sql/schema.sql");
+
+        try (Connection connection = DataSourceProvider.getDataSource().getConnection();
+            Statement statement = connection.createStatement()) {
+
+            statement.execute(sql);
+
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        System.out.println("Ready");
+    }
+
+    @Override
+    public void contextDestroyed(ServletContextEvent sce) {
+
+    }
+}

src/main/java/api/Orders.java

@@ -1,42 +0,0 @@
-package api;
-
-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 java.io.IOException;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-import java.util.stream.Collectors;
-
-@WebServlet("/api/orders")
-public class Orders extends HttpServlet {
-    private static final long serialVersionUID = 1L;
-    private int lastOrderId = 0;
-    private Pattern orderPattern = Pattern.compile(".*\"orderNumber\":\\s*\"(.*)\".*");
-
-    @Override
-    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
-        resp.getWriter().format("%d", lastOrderId);
-    }
-
-    @Override
-    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
-        resp.setContentType("application/json");
-        String order = req.getReader().lines().collect(Collectors.joining(" "));
-        int orderId = lastOrderId++;
-        Matcher matcher = orderPattern.matcher(order);
-        boolean matches = matcher.matches();
-
-        if (matches && matcher.groupCount() > 0) {
-            String orderNumber = matcher.group(1);
-            System.out.format("request data: %s, orderNumber: %s\n", order, orderNumber);
-            resp.getWriter().printf("{\"id\": %d, \"orderNumber\": \"%s\"}", orderId, orderNumber);
-        } else {
-            resp.getWriter().print("\"Invalid request\"");
-        }
-
-
-    }
-}

src/main/java/servlet/api/Orders.java

@@ -0,0 +1,53 @@
+package servlet.api;
+
+import DAO.OrdersDao;
+import DTO.Order;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import javax.servlet.ServletContextEvent;
+import javax.servlet.ServletContextListener;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebListener;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+@WebServlet(urlPatterns = "/api/orders", name="Orders")
+public class Orders extends HttpServlet {
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.setContentType("application/json");
+        String idString = req.getParameter("id");
+        if (idString != null) {
+            int id = Integer.parseInt(idString);
+            Order order = OrdersDao.getOrderForId(id);
+            if (order == null) {
+                resp.setStatus(404);
+                return;
+            }
+            resp.getWriter().print(new ObjectMapper().writeValueAsString(order));
+            return;
+        }
+        List<Order> orders = OrdersDao.getAllOrders();
+        resp.getWriter().print(new ObjectMapper().writeValueAsString(orders));
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.setContentType("application/json");
+        String orderJson = req.getReader().lines().collect(Collectors.joining(" "));
+
+        Order order = new ObjectMapper().readValue(orderJson, Order.class);
+        OrdersDao.saveOrder(order);
+        resp.getWriter().print(new ObjectMapper().writeValueAsString(order));
+
+    }
+}

src/main/java/servlet/html/Index.java

@@ -0,0 +1,20 @@
+package servlet.html;
+
+import util.FileUtil;
+
+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 java.io.IOException;
+
+@WebServlet(urlPatterns = "/", name="Index")
+public class Index extends HttpServlet {
+
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        response.setContentType("text/html; charset=utf-8");
+        String index = FileUtil.readFileFromClasspath("html/index.html");
+        response.getWriter().print(index);
+    }
+}

src/main/java/servlet/html/OrdersForm.java

@@ -0,0 +1,45 @@
+package servlet.html;
+
+import DAO.OrdersDao;
+import DTO.Order;
+import servlet.api.Orders;
+
+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 java.io.IOException;
+
+@WebServlet(urlPatterns = "/orders/form", name="OrdersForm")
+public class OrdersForm extends HttpServlet
+{
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+
+        resp.setContentType("text/html; charset=utf-8");
+        resp.getWriter().print(
+                "<form  method=post>" +
+                "<label for=orderNumber>Order Number</label> " +
+                "<input type=text name=orderNumber></input> " +
+                "<input type=submit></input>" +
+                "</form>"
+        );
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.setContentType("application/json");
+        String orderNumber = req.getParameter("orderNumber");
+        if (orderNumber == null) {
+            resp.setStatus(400, "orderNumber parameter is empty");
+            resp.getWriter().print("orderNumber parameter is empty");
+            return;
+        }
+
+        Order order = new Order();
+        order.setOrderNumber(orderNumber);
+        OrdersDao.saveOrder(order);
+        resp.getWriter().format("%d", order.getId());
+    }
+}

src/main/java/servlet/test/HelloServlet.java

@@ -1,4 +1,4 @@
-package test;
+package servlet.test;
 
 import java.io.IOException;
 import javax.servlet.ServletException;
@@ -7,7 +7,7 @@ import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
-@WebServlet("/hello")
+@WebServlet(urlPatterns = "/hello", name="Hello")
 public class HelloServlet extends HttpServlet {
     private static final long serialVersionUID = 1L;
 

src/main/java/util/DataSourceProvider.java

@@ -0,0 +1,35 @@
+package util;
+
+import org.apache.commons.dbcp2.BasicDataSource;
+
+import javax.sql.DataSource;
+
+public class DataSourceProvider {
+
+    private static String dbUrl = null;
+
+    private static BasicDataSource dataSource = null;
+
+    public static void setDbUrl(String url) {
+        dbUrl = url;
+    }
+
+    public static DataSource getDataSource() {
+        if (dataSource != null) {
+            return dataSource;
+        }
+
+        if (dbUrl == null) {
+            throw new IllegalStateException(
+                    "Database url not configured. Use setDbUrl()");
+        }
+
+        dataSource = new BasicDataSource();
+        dataSource.setDriverClassName("org.hsqldb.jdbcDriver");
+        dataSource.setUrl(dbUrl);
+        dataSource.setMaxTotal(3);
+
+        return dataSource;
+    }
+
+}

src/main/java/util/FileUtil.java

@@ -0,0 +1,26 @@
+package util;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.stream.Collectors;
+
+public class FileUtil {
+
+    public static String readFileFromClasspath(String pathOnClasspath) {
+        try (InputStream is = FileUtil.class.getClassLoader().getResourceAsStream(pathOnClasspath)) {
+            if (is == null) {
+                throw new IllegalStateException("can't load file: " + pathOnClasspath);
+            }
+
+            BufferedReader buffer = new BufferedReader(new InputStreamReader(is));
+
+            return buffer.lines().collect(Collectors.joining("\n"));
+
+        } catch (IOException e) {
+            throw new RuntimeException();
+        }
+    }
+
+}

src/main/resources/html/index.html

@@ -0,0 +1,9 @@
+<!doctype html>
+<html>
+<title>Index</title>
+<h1>Shop</h1>
+<h3>Menu</h3>
+<ul>
+    <li><a href=/orders/form>Orders form</a></li>
+</ul>
+</html>

src/main/resources/sql/schema.sql

@@ -0,0 +1,4 @@
+CREATE TABLE orders (
+id BIGINT NOT NULL PRIMARY KEY ,
+order_number VARCHAR (255)
+);