MySql curdate() example using Java servlet

In this tutorial you will learn about how Mysql curdate() function works in using java servlet.

MySql curdate() example using Java servlet

In this tutorial you will learn about how Mysql curdate() function works in using java servlet.

CURDATE() function of MySql returns the date of current system in the format yyyy-mm-dd, format of date may vary depending on the function whether it uses numeric or string. 'CURRENT_DATE' and 'CURRENT_DATE()' are similar to the CURDATE() function that returns the date of current system. CURDATE()+1 function will return date in numeric format. Now, since I have to use this function in java servlet program, therefore I have created a java servlet class named MysqlCurrentDateServlet which extends the HttpServlet class. In the body of class I overridden the method doGet() and created an objects of HttpServletRequest and HttpServletResponse into its parameter. Inside the doGet() method first I set the mime type that in which format the browser will show the output. In the next line I used the getWriter() method of ServletResponse interface with the object of HttpServletResponse. HttpServletResponse interface extends this method from the ServletResponse. In continue we have to make a connection between java code and database system. So, since I am using Mysql in the example given below therefore, I am loading the driver of mysql and make a connection by using the getConnection() method of DriverManager class. It returns a Connection. Further I am passing the query "SELECT CURDATE()" (This query will return the date of current system) and " SELECT CURDATE()+1 " (This query will return date in numeric format) into the parameter of prepareStatement() method of Connection interface which gives an object of PreparedStatement interface. In the next line I used the executeQuery() method of PreparedStatement interface which returns a ResultSet object that holds the result of query. At last I have extracted the result from the ResultSet object.

Example :

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class MysqlCurrentDateServlet extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse res)
	throws IOException, ServletException
	{
		res.setContentType("text/html");
		PrintWriter pw = res.getWriter();
		String driver = "com.mysql.jdbc.Driver";
		String url = "jdbc:mysql://192.168.10.13/data";
		String uid = "root";
		String psw = "root";
		String sql = "SELECT CURDATE()";
		String sql1 = "SELECT CURDATE()+1";
		Connection con;
		PreparedStatement ps,ps1;
		ResultSet rs,rs1;
		try
		{
			Class.forName(driver);
			con = DriverManager.getConnection(url,uid,psw);
			ps = con.prepareStatement(sql);
			rs = ps.executeQuery();
			ps1 = con.prepareStatement(sql1);
			rs1 = ps1.executeQuery();
						
			pw.println("<table><tr>");
			pw.println("<td><b>curdate()</b></td>");
			pw.println("</tr>");
			while(rs.next())
			{
				String crd = rs.getString(1);
				pw.println("<tr>");
				pw.println("<td>"+crd+"</td>");
				pw.println("</tr>");
			}
			
			pw.println("</table>");
			pw.println("<br><b>Numeric format of date</b>");
			pw.println("<table><tr>");
			pw.println("<td><b>curdate()+1</b></td>");
			pw.println("</tr>");
			while(rs1.next())
			{
				String crd1 = rs1.getString(1);
				pw.println("<tr>");
				pw.println("<td>"+crd1+"</td>");
				pw.println("</tr>");
			}
			pw.println("</table>");
			
		}
		catch(SQLException sx)
		{
			pw.println(sx);
		}
		catch(ClassNotFoundException cx)
		{
			pw.println();
		}
	}
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>mysqlDate</display-name>

<servlet>
<servlet-name>MysqlCurrentDateServlet</servlet-name>
<servlet-class>MysqlCurrentDateServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>MysqlCurrentDateServlet</servlet-name>
<url-pattern>/MysqlCurrentDateServlet</url-pattern>
</servlet-mapping>

</web-app>

Output :

When you will execute the above example you will get the output as :

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