servle



import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/Servlet")
public class Servlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public Servlet() {
        super();
    }
    PrintWriter out;
    Connection con;
    ResultSet rs;
    Statement stat;
    private String prolog = "<html><title>Baza ksiazek</title>";
    private String epilog = "</body></html>";
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html; charset=ISO-8859-2");


        try {
             Class.forName("oracle.jdbc.driver.OracleDriver");
             out = response.getWriter();
            con = DriverManager.getConnection("jdbc:oracle:thin:@db-oracle:1521:baza","s15224","oracle12");
            stat = con.createStatement();
            rs = stat.executeQuery("SELECT * FROM KSIAZKA");
            toPage();
            if(request.getParameter("ident")!=null){
            String s = request.getParameter("ident");
            rs = stat.executeQuery("SELECT * FROM KSIAZKA WHERE AUTOR='"+s+"'");
            response.reset();
            toPage();
            }
        } catch (SQLException e) {
            System.out.println("SQL exception: "+e.toString());
        } catch (ClassNotFoundException e) {
        System.out.println("class exception: "+e.toString());
        }
    }
    private void toPage() {
        StringBuilder buf = new StringBuilder();
           buf.append(prolog+"<body>");
           buf.append("<form method=\"get\" action=\"http://localhost:8080/TPO4_PJ_S152241/Servlet\">"
                + "<input type=\"text\" size=\"50\" name=\"ident\"><input type=\"submit\" value=\"search\"></form>");

           buf.append("<table>" +
                   "<tr>" +
                   "<th>Tytul</th>" +
                   "<th>Autor</th>" +
                   "<th>Wydawnictwo</th>" +
                   "<th>Rok wydania</th>"+
                   "</tr>");
              try {
                while (rs.next()) {
                        buf.append("<tr><td>"+rs.getString("TYTUL") + "</td><td>"+ rs.getString("AUTOR") + "</td><td>" + rs.getString("WYDAWNICTWO")+"</td><td>" + rs.getString("ROK")+"</td></tr>");
                    }
            } catch (SQLException e) {
                e.printStackTrace();
            }
              buf.append("</table>"+epilog);
            out.println(buf);

    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);

    }


}