hw2

build.gradle

@@ -8,7 +8,7 @@ repositories {
     mavenCentral()
 }
 
-sourceCompatibility = 8
+sourceCompatibility = 10
 
 dependencies {
     compileOnly 'javax.servlet:javax.servlet-api:4.0.1'

src/main/java/api/Orders.java

@@ -0,0 +1,42 @@
+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\"");
+        }
+
+
+    }
+}