Web Science/Part1: Foundations of the web/Dynamic Web Content/Basics of server side web programming/script

Da Wikiversità, l'apprendimento libero.

Register.java

import java.io.IOException;

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

import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.webapp.WebAppContext;

public class Register extends HttpServlet {

	private Connection connect = null;
	private Statement statement = null;
	private ResultSet resultSet = null;

	public Register() {
		try {
			Class.forName("com.mysql.jdbc.Driver");
			// Setup the connection with the DB
			connect = DriverManager
					.getConnection("jdbc:mysql://localhost/mooc?"
							+ "user=mooc&password=studywebscience");

			// Statements allow to issue SQL queries to the database
			statement = connect.createStatement();
			// Result set get the result of the SQL query
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		resp.getWriter().write("hello world");
	}

	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {

	}

	public static void main(String[] args) throws Exception {
		Server server = new Server(8080);

		WebAppContext context = new WebAppContext();
		context.setDescriptor("WEB-INF/web.xml");
		context.setResourceBase("");
		context.setContextPath("");
		context.setParentLoaderPriority(true);

		server.setHandler(context);

		server.start();
		server.join();
	}
}

index.html

<html>
<head><title>Registration Form</title></head>
<body>
<h1>Registration Form for the Web Science MOOC</h1>
</body>
</html>

WEB-INF/web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
  <servlet>
    <servlet-name>Register</servlet-name>
    <servlet-class>Register</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>Register</servlet-name>
    <url-pattern>/servlet</url-pattern>
  </servlet-mapping>
</web-app>