Get current logged in username in Spring Security

1. SecurityContextHolder + Authentication.getName()

import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
 
@Controller
public class LoginController {
 
  @RequestMapping(value="/login", method = RequestMethod.GET)
  public String printUser(ModelMap model) {
 
      Authentication auth = SecurityContextHolder.getContext().getAuthentication();
      String name = auth.getName(); //get logged in username
 
      model.addAttribute("username", name);
      return "hello";
 
  }
  //...

2. SecurityContextHolder + User.getUsername()

import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
 
@Controller
public class LoginController {
 
  @RequestMapping(value="/login", method = RequestMethod.GET)
  public String printUser(ModelMap model) {
 
      User user = (User)SecurityContextHolder.getContext().getAuthentication().getPrincipal();
      String name = user.getUsername(); //get logged in username
 
      model.addAttribute("username", name);
      return "hello";
 
  }
  

3. UsernamePasswordAuthenticationToken

This is more elegant solution, in runtime, Spring will injects UsernamePasswordAuthenticationTokeninto the Principal interface.

import java.security.Principal;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
 
@Controller
public class LoginController {
 
  @RequestMapping(value="/login", method = RequestMethod.GET)
  public String printWelcome(ModelMap model, Principal principal ) {
 
      String name = principal.getName(); //get logged in username
      model.addAttribute("username", name);
      return "hello";
 
  }
  //...

iReport - java.lang.NoClassDefFoundError: org/codehaus/groovy/control/CompilationFailedException

iReport - java.lang.NoClassDefFoundError: org/codehaus/groovy/control/CompilationFailedException

Un error bastante habitual que se produce cuando trabajamos con la herramienta iReports, creo que a partir de la versión 3 (en mi caso concreto, la 3.7.0).

Cuando creamos un informe con esta herramienta, podemos encontrarnos con el siguiente error al compilar:

java.lang.NoClassDefFoundError: org/codehaus/groovy/control/CompilationFailedException

La causa es tan simple como que el lenguaje seleccionado para el informe es, por defecto, Groovy en lugar de Java. Para solucionarlo seleccionamos nuestro report (el elemento raíz de la vista Report Inspector), y entre las propiedades editamos el valor de Language.

Para evitar tener que realizar este cambio con todos los nuevos informes que generemos, lo suyo es elegir Java como lenguaje predeterminado para nuestro iReports. Esto podemos hacerlo a través del menú Herramientas - Opciones, en la pestaña iReport - General (la que veremos al acceder al menú).

Fuente original: 

http://tecno-aspirinas.blogspot.mx/2010/04/ireport-javalangnoclassdeffounderror.html

Submitting multipart/form-data using jQuery and Ajax

It is possible to submit files using "multipart/form-data" and ajax. There are many sites out there that show complicated ways of doing this when it is really easy. It simply requires a little configuration of the jquery ajax process and grabbing your form data using the FormData() function.

Using the following method, you can submit multiple files and are not just limited to one.

Lets take a look at our form.

<form id="data">
  <input type="hidden" name="id" value="123" readonly="readonly">
  User Name: <input type="text" name="username" value=""><br />
  Profile Image: <input name="profileImg[]" type="file" /><br />
  Display Image: <input name="displayImg[]" type="file" /><br />
  <input type="submit" value="Submit">
</form>

The above form has a hidden field, a user name field, and then two file image fields that we are going to submit to our PHP processing page.

Now lets look at the jQuery used to submit the form using "multipart/form-data" and ajax.

//Program a custom submit function for the form
$("form#data").submit(function(event){
 
  //disable the default form submission
  event.preventDefault();
 
  //grab all form data  
  var formData = new FormData($(this)[0]);
 
  $.ajax({
    url: 'formprocessing.php',

    //url: 'NombreServlet',/*Java*/

    type: 'POST',
    data: formData,
    async: false,
    cache: false,
    contentType: false,
    processData: false,
    success: function (returndata) {
      alert(returndata);
    }
  });
 
  return false;
});

That is all that is needed to submit your "multipart/form-data" form to a PHP processing page using ajax. You would call your form data on the processing page like normal.

$id = $_POST['id'];
$username = $_POST['username'];
$profileImg = $_FILES['profileImg'];
$displayImg = $_FILES['displayImg'];

Recurso tomado de http://digipiph.com/blog/submitting-multipartform-data-using-jquery-and-ajax

Javascript: mostrar el contenido de un objeto

Para imprimir el contenido completo de un objeto, en Firefox, podemos utilizar la siguiente instrucción:

alert(object.toSource());

También se puede acceder a todos los elementos de un objeto mediante un bucle foreach. La siguiente función ImprimirObjeto monstrará un alert() que muestra todas las propiedades y los valores respectivos.

function ImprimirObjeto(o) {
  var salida = '';
  for (var p in o) {
    salida += p + ': ' + o[p] + '\n';
  }
  alert(salida);
}

Por ejemplo:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>imprimir objeto</title>
<script type="text/javascript">
function ImprimirObjeto(o) {
  var salida = '';
  for (var p in o) {
    salida += p + ': ' + o[p] + '\n';
  }
  alert(salida);
}
var Objeto = {'algo1': 1, 'algo2': 2};
</script>
</head>
<body>
<a href="javascript:ImprimirObjeto(Objeto);">mostrar</a>
</body>
</html>

Fuente tomada de: http://webintenta.com/javascript-mostrar-el-contenido-de-un-objeto.html