【发布时间】：2018-04-17 22:26:08
【问题描述】：
我是编程新手，所以对我来说有点难，但我正在尝试使用 java (servlet) 上的存储过程执行登录 (JSP)，遗憾的是 servlet 页面只给了我一个空白页，并没有将我重定向到主页 homeAlumno.jsp（目前只有一个 Hello World 的 JSP），我使用的是 netbeans IDE 8.2（带有 Tomcat 服务器），数据库是 Oracle 11g Express Edition，有几个表，任何帮助或建议将不胜感激。
pd：第一次发帖，如果我发错了对不起：'D
这是代码
login.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Login CEM</title>
</head>
<body style="text-align: center">
<h1>Menú CEM</h1>
<form method="POST" action="serv_login">
<input type="text" name="usuario" placeholder="Nombre"/>
<input type="password" name="pass" placeholder="Password" />
<input type="submit" value="Login"/>
</form>
</body>
</html>
类连接（连接）
package modelo;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class Conexion {
private static Connection cnx = null;
public static Connection obtener() throws SQLException, ClassNotFoundException {
if (cnx == null) {
try {
Class.forName("oracle.jdbc.OracleDriver");
cnx = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "system", "123");
} catch (SQLException ex) {
throw new SQLException(ex);
} catch (ClassNotFoundException ex) {
throw new ClassCastException(ex.getMessage());
}
}
return cnx;
}
public static void cerrar() throws SQLException {
if (cnx != null) {
cnx.close();
}
}
}
serv_login.java (servlet)
package controlador;
import java.io.IOException;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import modelo.Conexion;
/**
*
* @author asd
*/
@WebServlet(name = "serv_login", urlPatterns = {"/serv_login"})
public class serv_login extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
try {
String usuario = request.getParameter("usuario");
String pass = request.getParameter("pass");
CallableStatement stmt = Conexion.obtener().prepareCall("{call LoginJava(?,?)}");
stmt.setString(1, usuario);
stmt.setString(2, pass);
ResultSet rs = stmt.executeQuery();
RequestDispatcher rd;
rd = request.getRequestDispatcher("login.jsp");
while(rs.next()) {
if(rs.getString("NOMBRE_ALUMN").equals(request.getParameter("usuario")) && rs.getString("PASS_ALUMN").equals(request.getParameter("pass"))){
request.getRequestDispatcher("homeAlumno.jsp");
rd.forward(request, response);
}else{
request.getRequestDispatcher("login.jsp");
rd.forward(request, response);
}
}
} catch (SQLException ex) {
ex.getMessage();
} catch (ClassNotFoundException ex) {
Logger.getLogger(serv_login.class.getName()).log(Level.SEVERE, null, ex);
ex.getMessage();
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
存储过程（Oracle DB）
create or replace procedure LoginJava(usuario ALUMNO.USU_ALUMN%type,
contraseña ALUMNO.PASS_ALUMN%type)
as
v_usuario ALUMNO.USU_ALUMN%type;
v_contraseña ALUMNO.PASS_ALUMN%type;
begin
select USU_ALUMN, PASS_ALUMN into v_usuario, v_contraseña from ALUMNO
where USU_ALUMN = usuario and PASS_ALUMN = contraseña;
return;
end;
谢谢！
【问题讨论】：
标签： java jsp servlets stored-procedures oracle11g