Program 1
package browser;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.*;
public class SQLQueryBrowser extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
try (PrintWriter out = response.getWriter()) {
/* TODO output your page here. You may use following sample code. */
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet SQLQueryBrowser</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet SQLQueryBrowser at " + request.getContextPath() + "</h1>");
out.println("</body>");
out.println("</html>");
}
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet SQLQueryBrowser</title>");
out.println("</head>");
out.println("<body>");
out.println("<center>");
out.println("<font color=red size=7>S</font>");
out.println("<font color=black size=7>Q</font>");
out.println("<font color=green size=7>L</font>");
out.println("<font color=red size=7>B</font>");
out.println("<font color=yellow size=7>R</font>");
out.println("<font color=blue size=7>O</font>");
out.println("<font color=red size=7>W</font>");
out.println("<font color=blue size=7>S</font>");
out.println("<font color=green size=7>E</font>");
out.println("<font color=black size=7>R</font>");
out.println("<form method=post action=SQLQueryBrowser>");
out.println("<textarea rows=20 cols=100 name=txtsql></textarea>");
out.println("<br>");
out.println("<input type=submit value=Execute>");
out.println("</form>");
out.println("</center>");
out.println("</body>");
out.println("</html>");
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
PrintWriter out = response.getWriter();
try
{
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet SQLQueryBrowser</title>");
out.println("</head>");
out.println("<body>");
out.println("<center>");
out.println("<font color=red size=7>S</font>");
out.println("<font color=black size=7>Q</font>");
out.println("<font color=green size=7>L</font>");
out.println("<font color=red size=7>B</font>");
out.println("<font color=yellow size=7>R</font>");
out.println("<font color=blue size=7>O</font>");
out.println("<font color=red size=7>W</font>");
out.println("<font color=blue size=7>S</font>");
out.println("<font color=green size=7>E</font>");
out.println("<font color=black size=7>R</font>");
out.println("<form method=post action=SQLQueryBrowser>");
out.println("<textarea rows=20 cols=100 name=txtsql></textarea>");
out.println("<br>");
out.println("<input type=submit value=Execute>");
out.println("</form>");
String sql;
sql=request.getParameter("txtsql");
// out.println(sql);
Connection con=null;
PreparedStatement ps=null;
ResultSet rs=null;
ResultSetMetaData rsmd=null;
Class.forName("com.mysql.jdbc.Driver");
con=DriverManager.getConnection("jdbc:mysql://localhost/dataflair","root","root@data");
ps=con.prepareStatement(sql);
if(sql.toUpperCase().startsWith("SELECT"))
{
rs=ps.executeQuery();
rsmd=rs.getMetaData();
//out.println(rsmd.getColumnCount());
out.println("<table border=1>");
out.println("<tr>");
for(int i=1;i<=rsmd.getColumnCount();i++)
out.println("<th>"+rsmd.getColumnName(i)+"</th>");
out.println("</tr>");
while(rs.next())
{
out.println("<tr>");
for(int i=1;i<=rsmd.getColumnCount();i++)
out.println("<td>"+rs.getString(i)+"</td>");
out.println("</tr>");
}
out.println("</table>");
}
else
{
int n=0;
n=ps.executeUpdate();
out.println("<B>record affect: </B>" +n);
}
out.println("</center>");
out.println("</body>");
out.println("</html>");
}
catch(Exception e)
{
out.println(e);
}
}
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
