answer for http://stackoverflow.com/questions/22877860/pass-value-bea…

…n-java-to-servlet
literakl · Apr 5, 2014 · 6d6c601 · 6d6c601
1 parent d663b6f
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Showing 6 changed files with 167 additions and 17 deletions.
diff --git a/web-module/pom.xml b/web-module/pom.xml
@@ -27,6 +27,11 @@
         	<artifactId>commons-fileupload</artifactId>
         	<version>1.3.1</version>
         </dependency>
+        <dependency>
+        	<groupId>org.jumpmind.symmetric.jdbc</groupId>
+        	<artifactId>mariadb-java-client</artifactId>
+        	<version>1.1.1</version>
+        </dependency>
     </dependencies>
 
     <build>

diff --git a/web-module/src/main/java/cz/literak/sandbox/so/register/Controller.java b/web-module/src/main/java/cz/literak/sandbox/so/register/Controller.java
@@ -0,0 +1,31 @@
+package cz.literak.sandbox.so.register;
+
+import javax.annotation.Resource;
+import javax.servlet.RequestDispatcher;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.sql.DataSource;
+import java.io.IOException;
+
+/**
+ * Date: 5. 4. 2014
+ */
+public class Controller extends HttpServlet {
+    @Override
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        String name = request.getParameter("name");
+        String phone = request.getParameter("phone");
+        // todo check parameters
+
+        User user = new User(name, phone);
+        DAO dao = new DAO();
+        dao.saveUser(user);
+        request.setAttribute("USER", user);// consider using session
+        // TODO handle errors
+
+        RequestDispatcher dispatcher = request.getRequestDispatcher("register/index.jsp");
+        dispatcher.forward(request, response);
+    }
+}
diff --git a/web-module/src/main/java/cz/literak/sandbox/so/register/DAO.java b/web-module/src/main/java/cz/literak/sandbox/so/register/DAO.java
@@ -0,0 +1,37 @@
+package cz.literak.sandbox.so.register;
+
+import javax.servlet.ServletException;
+import java.sql.*;
+
+/**
+ * Date: 5. 4. 2014
+ */
+public class DAO {
+    static {
+        try {
+            Class.forName("org.mariadb.jdbc.Driver");
+//            Class.forName("com.mysql.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public User findUser(String phone) {
+        // todo
+        return null;
+    }
+
+    //  DDL: CREATE TABLE user (name VARCHAR(100), phone VARCHAR(100))
+    public boolean saveUser(User user) throws ServletException {
+        try (
+             Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "secret");
+             PreparedStatement ps = con.prepareStatement("INSERT INTO user VALUES(?,?)"))
+        {
+            ps.setString(1, user.getName());
+            ps.setString(2, user.getPhone());
+            return ps.execute();
+        } catch (SQLException e) {
+            throw new ServletException("DB operation failed", e);
+        }
+    }
+}
diff --git a/web-module/src/main/java/cz/literak/sandbox/so/register/User.java b/web-module/src/main/java/cz/literak/sandbox/so/register/User.java
@@ -0,0 +1,30 @@
+package cz.literak.sandbox.so.register;
+
+/**
+ * Date: 5. 4. 2014
+ */
+public class User {
+    String name;
+    String phone;
+
+    public User(String name, String phone) {
+        this.name = name;
+        this.phone = phone;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getPhone() {
+        return phone;
+    }
+
+    public void setPhone(String phone) {
+        this.phone = phone;
+    }
+}
diff --git a/web-module/src/main/webapp/WEB-INF/web.xml b/web-module/src/main/webapp/WEB-INF/web.xml
@@ -4,26 +4,34 @@
 
 <web-app>
     <display-name>Archetype Created Web Application</display-name>
-    <listener>
-        <listener-class>
-            org.apache.commons.fileupload.servlet.FileCleanerCleanup
-        </listener-class>
-    </listener>
+    <!--<listener>-->
+        <!--<listener-class>-->
+            <!--org.apache.commons.fileupload.servlet.FileCleanerCleanup-->
+        <!--</listener-class>-->
+    <!--</listener>-->
 
+    <!--<servlet>-->
+        <!--<servlet-name>FileUploader</servlet-name>-->
+        <!--<servlet-class>cz.literak.sandbox.so.http.upload.FileUploadServlet</servlet-class>-->
+    <!--</servlet>-->
+    <!--<servlet>-->
+        <!--<servlet-name>FileReceiver</servlet-name>-->
+        <!--<servlet-class>cz.literak.sandbox.so.http.upload.FileReceiveServlet</servlet-class>-->
+    <!--</servlet>-->
     <servlet>
-        <servlet-name>FileUploader</servlet-name>
-        <servlet-class>cz.literak.sandbox.so.http.upload.FileUploadServlet</servlet-class>
+        <servlet-name>RegistrationController</servlet-name>
+        <servlet-class>cz.literak.sandbox.so.register.Controller</servlet-class>
     </servlet>
-    <servlet>
-        <servlet-name>FileReceiver</servlet-name>
-        <servlet-class>cz.literak.sandbox.so.http.upload.FileReceiveServlet</servlet-class>
-    </servlet>
-    <servlet-mapping>
-        <servlet-name>FileUploader</servlet-name>
-        <url-pattern>/uploader</url-pattern>
-    </servlet-mapping>
+    <!--<servlet-mapping>-->
+        <!--<servlet-name>FileUploader</servlet-name>-->
+        <!--<url-pattern>/uploader</url-pattern>-->
+    <!--</servlet-mapping>-->
+    <!--<servlet-mapping>-->
+        <!--<servlet-name>FileReceiver</servlet-name>-->
+        <!--<url-pattern>/receiver</url-pattern>-->
+    <!--</servlet-mapping>-->
     <servlet-mapping>
-        <servlet-name>FileReceiver</servlet-name>
-        <url-pattern>/receiver</url-pattern>
+        <servlet-name>RegistrationController</servlet-name>
+        <url-pattern>/RegistrationController</url-pattern>
     </servlet-mapping>
 </web-app>
diff --git a/web-module/src/main/webapp/register/index.jsp b/web-module/src/main/webapp/register/index.jsp
@@ -0,0 +1,39 @@
+<%--
+  Date: 5. 4. 2014
+  This code is intented as show case for stackoverflow user having trouble
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+<html>
+<head>
+    <title>Registration sample</title>
+</head>
+<body>
+
+    <%--@elvariable id="USER" type="cz.literak.sandbox.so.register.User"--%>
+    <c:choose>
+        <c:when test="${USER == null}">
+            <form action="${pageContext.request.contextPath}/RegistrationController" method="post">
+                <table>
+                    <tr>
+                        <td>User name</td>
+                        <td><input type="text" name="name" ></td>
+                    </tr>
+                    <tr>
+                        <td>Phone</td>
+                        <td><input type="text" name="phone"></td>
+                    </tr>
+                    <tr>
+                        <td></td>
+                        <td><input type="submit" value="submit"></td>
+                    </tr>
+                </table>
+            </form>
+        </c:when>
+        <c:otherwise>
+            Welcome <c:out value="${USER.name}"/>
+        </c:otherwise>
+    </c:choose>
+
+</body>
+</html>