by Dinesh Thakur Category: Servlet with MySql Database

This Function Will Add The Two Strings.

First, we have To Make a Table Named 'worker' In MySql (Php MyAdmin) Into the Database Named 'dbase'. Then we have to call The Packages from java Library. Then We Make a Class Named 'MySqlLiteralCharacters' Extends "HttpServlet". After, Initializing The Class We Declare The Methods Public void Service(),(The service method call the doGet() method for GET request from User) and In That The Objects called "Response Object" and "Request Object Which will Work According To Work. After, that We have to Load the Driver and Make Variables Of Resultset,Connection to establish The link between database and Query that Execute The Condition after Calling. After, Declaring the Prepared statement we have to put the Query ("SELECT last_name ||' is a '||job_id as UC FROM worker"). After that We will Use executeQuery() Method to Extract the Result On a 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 manner 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 MySqlLiteralCharacters 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_name ||' is a '||job_id as UC FROM worker");
                    rs = ps.executeQuery();
                 String title = "Using of Literal Characters";
                   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" +"</body> </html>");
                  while(rs.next())
                      {
                           String l_name = rs.getString("UC");
                         String  j_id = rs.getString("UC");
                           disp.println("<tr><td align=\"center\">" + l_name +  "<td align=\"center\">" + j_id +"</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>MySqlLiteralCharacters</servlet-name>
   <servlet-class>MySqlLiteralCharacters</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlLiteralCharacters</servlet-name>
   <url-pattern>/MySqlLiteralCharacters</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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