Skip to content

S
servlets
Commit 750a5979 by OscarGonzalez97
Options

se agrega clase de Context y se agregan context-params a la configuracion

parent bb365c60
Showing with 92 additions and 0 deletions
src/main/java/com/roshka/bootcamp/Context.java 0 → 100644
package com.roshka.bootcamp;
import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletContext;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.PrintWriter;
import java.sql.*;
@WebServlet("/context")
public class Context extends HttpServlet {
Connection connection;
public void init(ServletConfig config) {
ServletContext context = config.getServletContext();
try {
Class.forName("org.postgresql.Driver");
connection = DriverManager
.getConnection(context.getInitParameter("dbUrl"), context.getInitParameter("dbUser"), context.getInitParameter("dbPassword"));
} catch (Exception e) {
e.printStackTrace();
System.err.println(e.getClass().getName() + ": " + e.getMessage());
System.exit(0);
}
}
@Override
public void doGet(HttpServletRequest req, HttpServletResponse res) {
try {
Statement stmt = connection.createStatement();
res.setContentType("text/html");
PrintWriter out = res.getWriter();
ResultSet rs = stmt
.executeQuery("select a.nombre, apellido, count(b.cliente_id) Cantidad_factura from cliente a " +
"inner join factura b " +
"on a.id=b.cliente_id " +
"group by a.nombre, a.apellido " +
"order by Cantidad_factura desc;");
out.println("<html>");
out.println("<body>");
out.println("<h1 style=\"color:red;\">Esta es una url distinta</h1>");
while (rs.next()) {
String nombre = rs.getString("nombre");
String apellido = rs.getString("apellido");
int cantidad = rs.getInt("Cantidad_factura");
out.println("<p>NOMBRE = " + nombre + "</p>");
out.println("<p>APELLIDO = " + apellido + "</p>");
out.println("<p>CANTIDAD FACTURA = " + cantidad + "</p>");
}
out.println("</body>");
out.println("</html>");
rs.close();
stmt.close();
} catch (Exception e) {
System.err.println(e.getClass().getName() + ": " + e.getMessage());
}
}
public void destroy() {
try {
connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
src/main/webapp/WEB-INF/web.xml
......@@ -14,4 +14,21 @@
<url-pattern>/hola</url-pattern>
</servlet-mapping>
<!--Conext params-->
<context-param>
<param-name>dbUrl</param-name>
<param-value>jdbc:postgresql://localhost:5432/bootcamp_market</param-value>
</context-param>
<context-param>
<param-name>dbUser</param-name>
<param-value>postgres</param-value>
</context-param>
<context-param>
<param-name>dbPassword</param-name>
<param-value>postgres</param-value>
</context-param>
<!--Conext params-->
</web-app>
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment