Created user servlet

src/identity/controller/UserServlet.java

+package identity.controller;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import identity.model.User;
+import identity.model.UserDAO;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+public class UserServlet extends HttpServlet {
+
+    public void init() throws ServletException {
+        super.init();
+        getServletContext().setAttribute("userDAO", new UserDAO());
+    }
+
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+
+    }
+
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        String username = request.getParameter("username");
+
+        UserDAO userDAO = (UserDAO) getServletContext().getAttribute("userDAO");
+        User user = userDAO.getUserByUsername(username);
+        ObjectMapper mapper = new ObjectMapper();
+
+        String userJson = mapper.writeValueAsString(user);
+        response.setContentType("application/json");
+        PrintWriter writer = response.getWriter();
+        writer.print(userJson);
+        writer.flush();
+    }
+}

web/WEB-INF/web.xml

@@ -12,6 +12,10 @@
         <servlet-name>RegisterServlet</servlet-name>
         <servlet-class>identity.controller.RegisterServlet</servlet-class>
     </servlet>
+    <servlet>
+        <servlet-name>UserServlet</servlet-name>
+        <servlet-class>identity.controller.UserServlet</servlet-class>
+    </servlet>
     <servlet-mapping>
         <servlet-name>LoginServlet</servlet-name>
         <url-pattern>/login</url-pattern>
@@ -20,4 +24,8 @@
         <servlet-name>RegisterServlet</servlet-name>
         <url-pattern>/register</url-pattern>
     </servlet-mapping>
+    <servlet-mapping>
+        <servlet-name>UserServlet</servlet-name>
+        <url-pattern>/users</url-pattern>
+    </servlet-mapping>
 </web-app>
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