by Dinesh Thakur Category: Servlet with MySql Database

This function Will Returns the year and week.

We have create  database named 'dbase’. After that a class is been declared named 'MySqlYearWeekFunc' extends the 'HttpServlet'. With that kind of efforts, we need to define some methods, which do their job for exporting output. After we just declare Service method () (service method does the job of calling doGet() method for getting request).some variables also define as Connection,Resultset,PreparedStatement. Connection variable use to link between database and actual code (FrontEnd and BackEnd). preparedStatement will use to send the query to database like (Select YEARWEEK(CURDATE()) AS yrwk). This statement will work according to condition it shows. Now the next method executeQuery() will execute desired query and statement. And in the end doGet() method will be used to fetch the result on a web browser.

While getting the output on the web browser I use 'HTML' code and tag that will bring output in tabular form.

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 MySqlYearWeekFunc 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 YEARWEEK(CURDATE()) AS yrwk");
                 rs = ps.executeQuery();
             String title = "Using Year Week 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 Week 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>MySqlYearWeekFunc</servlet-name>
   <servlet-class>MySqlYearWeekFunc</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlYearWeekFunc</servlet-name>
   <url-pattern>/MySqlYearWeekFunc</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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