by Dinesh Thakur Category: Servlet with MySql Database

This Function Will show the Last Day of Month

First i make a table in database named 'dbase' within the reference of mySql(php myAdmin).then i import all the required java packages from the java library.then i made a class named 'MySqlLastDayFunc' which extends 'HttpServlet'. then after i use service()Mehod which will get the request from the doGet()Method.then i loaded all the require drivers for the database accessing.herei declare the variables like 'connection' this varaible will take over to create a link beetween a database and the java code.the other i declare 'resultSet' this will use to fetch the value from the columns and the rows from selected table.then i declare the 'preparedStatement' this variable will execute the selected query like executeQuery() as (Select LAST_DAY('2014-05-31')).i here use doGet()Method that will bring the output on the web browser.

To Getting Output on web browser in a tabular form i use 'HTML' code and tags.

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 MySqlLastDayFunc 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 LAST_DAY('2014-05-31') AS ld");
                 rs = ps.executeQuery();
              String title = "Using Last Day 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>Last Day Was</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>MySqlLastDayFunc</servlet-name>
   <servlet-class>MySqlLastDayFunc</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlLastDayFunc</servlet-name>
   <url-pattern>/MySqlLastDayFunc</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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