Java Made Easy

in this post we will call insertdetails method in servlet

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package database;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import model.UserBean;

/**
 *
 * @author Jagadeesh
 */
public class DBClass {
 public Connection createConnection() throws ClassNotFoundException,SQLException
    {
        Class.forName("com.mysql.jdbc.Driver");
        Connection connection = DriverManager.
         getConnection("jdbc:mysql://localhost:3306/userdbase", "root", "root");
        return connection;
    }
 //we get values from servlet by passing bean object to insertdetails method
   public int insertDetails(UserBean bb) throws SQLException, ClassNotFoundException
   {
     Connection con = createConnection();
     PreparedStatement pstmt = con.prepareStatement("insert into userdetails values(?,?,?,?)");
     //set values to prepared statement object by getting values from bean object
     pstmt.setString(1,bb.getUserName());
     pstmt.setString(2,bb.getDateOfBirth());
     pstmt.setString(3,bb.getEmail());
     pstmt.setString(4,bb.getPhoneNo());
     int i = pstmt.executeUpdate();
     return i;
       
   }
    public List getAlldetails()throws SQLException, ClassNotFoundException
    {
        //here we will write code to get all records from database
         Connection con = createConnection();
        PreparedStatement pstmt = con.prepareStatement("select * from userdetails");
        ResultSet rs = pstmt.executeQuery();
        List list = new ArrayList();
        while(rs.next())
        {
            UserBean ubean = new UserBean();
            ubean.setUserName(rs.getString(1));
            ubean.setDateOfBirth(rs.getString(2));
            ubean.setEmail(rs.getString(3));
            ubean.setPhoneNo(rs.getString(4));
            list.add(ubean);

        }
        return list;
    }
   /* public UserBean getDetails(int uid)throws SQLException, ClassNotFoundException
    {
        //here we will write code to get a single record from database
    }
     public int UpateDetails(int uid)throws SQLException, ClassNotFoundException
    {
        //here we will write code to update a record
    }*/
}

now call that insertdetails method in servlet

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import model.UserBean;
import validation.ValidateForm;
import database.DBClass;
/**
 *
 * @author Jagadeesh
 */
public class ControllerServlet extends HttpServlet {
   
   //declare values to get form values from jsp page
           String userName;
           String dateOfBirth;
           String email;
           String phoneNo;
           String action;

           UserBean bean = new UserBean();
           ValidateForm validateform = new ValidateForm();
           DBClass dbobject = new DBClass();
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
           //get the values from jsp page
            userName = request.getParameter("userName");
            dateOfBirth = request.getParameter("dateOfBirth");
            email = request.getParameter("email");
            phoneNo = request.getParameter("phoneNo");
            action = request.getParameter("action");
           if(action.equals("submit"))
           {
          //set values to bean.For this call below method
            setValuesToBean();

          //check all form values are valid or not. send bean object 
            UserBean checkedbean = validateform.validateData(bean);
            if(!checkedbean.getIsValid())
            {
                //if data is invalid.set bean object in request and pass that request to
                //insertupdate.jsp using forward
                request.setAttribute("error",checkedbean);
                RequestDispatcher rd = request.getRequestDispatcher("insertupdate.jsp");
                rd.forward(request, response);
                //now display errors in that jsp page
            }
            else
            {
                  //using DBClass object call insertDetails method and pass bean object
                 dbobject.insertDetails(bean);
                 List list = dbobject.getAlldetails();
                 request.setAttribute("list", list);
                 //forward to insertupdate page using requestdispatcher
                 RequestDispatcher rd= request.getRequestDispatcher("view.jsp");
                 //display a message to client.store message in request object
                //forwarding to jsp
                 rd.forward(request, response);

            }
           }
        } 
        catch(Exception e)
        {
            out.println(e);
        }
        finally {
            out.close();
        }
    }
    //this method is used to setvalues to bean
   public void setValuesToBean()
   {
       bean.setUserName(userName);
       bean.setDateOfBirth(dateOfBirth);
       bean.setEmail(email);
       bean.setPhoneNo(phoneNo);
       
   }
   
  
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

  
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    
    public String getServletInfo() {
        return "Short description";
    }

}