Why does not response.sendRedirect work?

Question

Why does not response.sendRedirect work?

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#1 by (0 votes)

0

I would like to know why the response.sendRedirect("URL") instruction does not work for me, then I leave the code, thank you very much.

Conexion c = new Conexion();
Usuario usu = new Usuario(c,c.crearConexion());
boolean resultado = usu.verificarCredenciales(request.getParameter("usuario"),request.getParameter("password"));
if(resultado){
    session.setAttribute("usuario",request.getParameter("usuario"));        
    response.sendRedirect("conectado_controlador.jsp");

} else {
    if(session.getAttribute("usuario") != null){
        response.sendRedirect("conectado_controlador.jsp");
    } else {
         response.sendRedirect("index_controlador.jsp");
    }

}

I have tried to use relative and absolute paths and nothing.

jsp

asked by Alberto Alaber 02.04.2018 в 21:33

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1 answer

How to do mongoimport from terminal Problem when starting modal for the second time

score 0 · Answer 1

Suppose we have 2 pages in the root path of our application:

index.jsp
otra.jsp

index.jsp has the following content:

<ul>
    <li>
        <a href="IndexServlet/requests?url=relativa">URL relativa</a>
    </li>
    <li>
        <a href="IndexServlet/requests?url=relativa-slash">URL relativa con slash</a>
    </li>
    <li>
        <a href="IndexServlet/requests?url=contexto">URL con contexto</a>
    </li>
    <li>
        <a href="IndexServlet/requests?url=absoluta">URL absoluta</a>
    </li>
</ul>

The servlet configuration in web.xml has:

<servlet>
    <servlet-name>IndexServlet</servlet-name>
    <servlet-class>jsp.ejemplo.IndexServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>IndexServlet</servlet-name>
    <url-pattern>/IndexServlet/requests</url-pattern>
</servlet-mapping>

And finally servlet IndexServlet has the following method to respond to requests GET :

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

    String url = request.getParameter("url");

    if(url.equals("relativa")) {
        response.sendRedirect("otro.jsp");
    } else if(url.equals("relativa-slash")) {
        response.sendRedirect("/otro.jsp");
    } else if(url.equals("contexto")) {
        response.sendRedirect(request.getContextPath() + "/otro.jsp");
    } else if(url.equals("absoluta")){
        response.sendRedirect("http://localhost:7001/jsp-app/otro.jsp");
    } else {
        response.sendError(500, "parametro url no valido");
    }
}

The result of navigating through the different links will be:

Relative URL: HTTP 404. The browser tries to access the url
```
"http://<Servidor>/jsp-app/IndexServlet/otra.jsp"
```
Relative URL with slash: HTTP 404. The browser tries to access the url
```
"http://<Servidor>/otra.jsp"
```
URL with context: OK. request.getContextPath() returns the context of the application /jsp-app and therefore the redirect is instructed to send to the relative url
```
"http://<Servidor>/jsp-app/otra.jsp"
```
Absolute URL: OK. The complete absolute url is sent to the redirect, so it is not translated when it is sent to the browser.
```
"http://<Servidor>/jsp-app/otra.jsp"
```

The context of the application depends on the application server used, in weblogic for example it is defined in weblogic.xml as:

<context-root>/jsp-app</context-root>