by Dinesh Thakur Category: Servlet with MySql Database

This Function will Returns the year.

i made a table in database named 'dbase' with required fields and within the reference of mySql(php myAdmin).then i import all the required java packages from java library. Then I made class, which extends 'HttpServlet' named 'MySqlYearFunc'. I use here serviceMethod() that will use to getting the request from the doGet ()method. Before declaring desired variables, i loaded all the required drivers for database accessing. Then after, i declare variable like 'connection' that will make a link between the database and the actual code. Here i declare 'resultSet' Also which is been responsible for the fetching value from the columns and rows. I declare 'preparedStatement' that will use to executing selected query like executeQuery() as (Select YEAR(CURDATE()) AS yr).I use doGet()Method that will get Output on the web browser.

On the web Browser i use 'Html' tags to print the output in tabular form on the web browser this will present output in a Efficient look. 

import java.io.IOException;

import java.io.PrintWriter;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MySqlYearFunc extends HttpServlet
   {
       public void service(HttpServletRequest rq, HttpServletResponse rp)throws IOException, ServletException
         {
             rp.setContentType("text/html");
             PrintWriter disp = rp.getWriter();
             String driver = "com.mysql.jdbc.Driver";
             String url = "jdbc:mysql://localhost/dbase";
             String uid = "root";
             String psw = "root";
             Connection con=null;
             PreparedStatement ps = null;
             ResultSet rs;
             try
              {
                  Class.forName(driver);
                  con = DriverManager.getConnection(url,uid,psw);
                  ps=con.prepareStatement("Select YEAR(CURDATE()) AS yr");
                  rs = ps.executeQuery();
              String title = "Using Year Function";
                  String docType ="<!doctype html public \"-//w3c//dtd html 4.0 " + "transitional//en\">\n";
             disp.println(docType + "<html>\n" + "<head><title>" + title + "</title></head>\n" +
                 "<body bgcolor=\"#f4efef\">\n" + "<h1 align=\"center\">" + title + "</h1>\n" + "<ul>\n" +
             "<table width=\"50%\" border=\"1\" align=\"center\">\n" + "<th>The Year Is</th>\n"+ "</body> </html>");
                 while(rs.next())
                    {
                         String curr = rs.getString(1);
                     disp.println("<tr><td align=\"center\">" + curr +"</td></tr>" );  
                     }     
               }      
                     catch(Exception e) 
                        {
                               e.printStackTrace();
                        }
                               disp.close();
           }
                       public void doPost(HttpServletRequest rq,HttpServletResponse rp)throws IOException,ServletException
                                 {
                                     doGet(rq,rp);
                                 }
   }
WEB.xml
 
<servlet>
   <servlet-name>MySqlYearFunc</servlet-name>
   <servlet-class>MySqlYearFunc</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlYearFunc</servlet-name>
   <url-pattern>/MySqlYearFunc</url-pattern>
</servlet-mapping>




About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.



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