Trabalho Java

package servlet;

import java.io.IOException;

import java.io.PrintWriter;

import java.sql.*;

import java.util.logging.Level;

import java.util.logging.Logger;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class Servicos extends HttpServlet {

@Override

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

String url = "jdbc:mysql://localhost:3306/cadastro";

String usuario = "root";

String senha = "";

PrintWriter out = response.getWriter();

int servico = Integer.parseInt(request.getParameter("tipo"));

out.println("<h1>" + servico + " recebido</h1>");

switch (servico) {

case 1:

break;

case 2:

break;

case 3:

break;

case 4:

try {

Class.forName("com.mysql.jdbc.Driver");

Connection conn = DriverManager.getConnection(url, usuario, senha);

// instrucoes SQL

Statement cmd = conn.createStatement();

ResultSet rs = cmd.executeQuery("select * from aluno");

out.print("<table border='1'>");

out.print("<tr>");

out.println("<td>RA</td>");

out.println("<td>Nome do Aluno</td>");

out.print("</tr>");

while (rs.next()) {

out.println("<tr>");