1. Create a new servlet page under the source package named Loginservlet:
Package weinidingservlet; The package in which the servlet resides
Import java.io.IOException;
Import Java.io.PrintWriter;
import javax.servlet.ServletException;
import Javax.servlet.annotation.WebServlet;
import Javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import Javax.servlet.http.HttpServletResponse; Packages that are imported automatically when you generate a servlet page
import java.sql.*; SQL statement packages that you need to add yourself
Import java.util.*;
Import Java.util.logging.Level;
Import Java.util.logging.Logger;
import weinidingservlet.myconnection; Database connections and action packs that you need to add yourself
import weinidingjavadata.wndmembers; Entity classes generated by the database that you need to add yourself
/**
*
* @author Spring Fei
*/
@WebServlet (name = "Loginservlet", Urlpatterns = {"/loginservlet"})
public class Loginservlet extends HttpServlet {
Public Loginservlet () {
Super ();
}
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet Request
* @param response servlet response
* @throws servletexception If a servlet-specific error occurs
* @throws IOException If an I/O error occurs
*/
protected void DoPost (HttpServletRequest request, httpservletresponse response)//dopost function primarily handles data submitted by the form's post method, The premise must be if the front-end form form has a method= "post"
Throws Servletexception, IOException {
try {
Response.setcontenttype ("Text/html;charset=utf-8");
String name=request.getparameter ("username"); The GetParameter method of the Request property gets the data field of the front-end form submission
String password=request.getparameter ("password");
wndmembers member=new wndmembers (); New an entity class generated by the database
member.setwndmembersname (name); Call the Set method in the entity class to assign the get data to the entity class
MEMBER.SETWNDMEMBERSPW (password);
myconnection my=new myconnection (); New class object for a database connection
My.init (); To invoke the initialization method of a database connection object
My.insert (member); Execute Insert Method
processrequest (request, response); //Used To return the corresponding front-end page
} catch (SQLException ex) {
Logger.getlogger (LoginServlet.class.getName ()). log ( Level.severe, NULL, ex);
}
}
/**
* Returns A short description of the servlet.
*
* @return a String containing servlet description
*/
protected void ProcessRequest (HttpServletRequest request, httpservletresponse response)
Throws Servletexception, IOException {
Try (PrintWriter out = Response.getwriter ()) {
/* TODO output your page here. Use following sample code. */
Out.println ("<! DOCTYPE html> ");
Out.println ("Out.println ("Out.println ("<title>servlet loginservlet</title>");
Out.println ("Out.println ("<body>");
Out.println ("Out.println ("</body>");
Out.println ("}
}
<editor-fold defaultstate= "collapsed" desc= "httpservlet methods. Click on the + sign on the left to edit the code. >
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet Request
* @param response servlet response
* @throws servletexception If a servlet-specific error occurs
* @throws IOException If an I/O error occurs
*/
@Override
protected void doget (HttpServletRequest request, httpservletresponse response)
Throws Servletexception, IOException {
ProcessRequest (request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet Request
* @param response servlet response
* @throws servletexception If a servlet-specific error occurs
* @throws IOException If an I/O error occurs
*/
@Override
Public String Getservletinfo () {
Return "Short description";
}//</editor-fold>
}
Java EE servlet handles request for form submission
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