by Dinesh Thakur Category: Servlet with MySql Database

This Function will return the HEXA DECIMAL value of a number.

First i made a database named 'dbase' within the reference of mySql(php myAdmin). Then I import all the required java packages from java library as program essentials. I made a class named ‘MySqlHEXAFunc’, which extends 'HttpServlet'. Then i use service()Method which will use to get the request from the doGet()Method for output on the browser. i loaded all the required drivers for accessing database as required. Then i use to declare the variable as I use 'connection' this will use to create a link between the database and the java code. Then i declare 'resultSet' this will responsible for get the value from selected columns and the rows. i use here now 'preparedStatement' this will execute the selected Query like executeQuery as (Select HEX(378)). Then i use doGet()Method that will bring the output on the web browser.

I use here some tags of 'HTML' that will bring output in a tabular form as required.  

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 MySqlHEXAFunc 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 HEX(378)");
                   rs = ps.executeQuery();
                String title = "Using HEXA 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>Value Is </th>\n"+ "</body> </html>");
                  while(rs.next())
                     {
                          String val = rs.getString(1);
                        disp.println("<tr><td align=\"center\">" + val +"</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>MySqlHEXAFunc</servlet-name>
   <servlet-class>MySqlHEXAFunc</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlHEXAFunc</servlet-name>
   <url-pattern>/MySqlHEXAFunc</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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