by Dinesh Thakur Category: Servlet with MySql Database

This function will Returns the current UTC time.

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 'MySqlUTCTimeFunc'. 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 that 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 UTC_TIME() AS utc).I use doGet()Method that will get Output on the web browser.

To get output on the web browser in a tabular form i use 'HTML' code and tag which bring output In Impressive mode. 

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 MySqlUTCTimeFunc 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 UTC_TIME() AS utc");
                     rs = ps.executeQuery();
                 String title = "Using UTC_TIME 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>Required Result 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>MySqlUTCTimeFunc</servlet-name>
   <servlet-class>MySqlUTCTimeFunc</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlUTCTimeFunc</servlet-name>
   <url-pattern>/MySqlUTCTimeFunc</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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