I use Spring Security. But if you are doing a sample, make a filter that
process a post.
Simple Example.
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
throws IOException, ServletException {
logger.info("Entrando en filtro para procesar el login afip");
// cast
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse resp = (HttpServletResponse) response;
// login
login(req);
// redirect to some url
redirectSomeUrl(req, resp);
}
private void login(HttpServletRequest req) {
// If is a POST login.
if ("POST".equals(req.getMethod())) {
validateData(req);
}
}
In validate data check info and create/invalidate session.
Hope helps.
2011/8/4 Luca Meloni <[email protected]>
> OK I read and now I think it's better to use a filter: have you got
> some sites to suggest me with filter examples? I would appreciate it,
> thank you
>
> On Aug 4, 4:35 pm, Juan Pablo Gardella <[email protected]>
> wrote:
> > Its best do the login in a filter. If you do the login in a filter always
> > execute before servlets.
> >
> > If you want use a servlet to do login and have other servlet with similar
> > url pattern read
> > this<
> http://www.roguewave.com/portals/0/products/hydraexpress/docs/4.6.0/h...>.
> > With filters you can explicity the order of execution, with servlet no
> (is
> > not define in the specification, so is the serlvet container decide,
> > unpredictable).
> >
> > Juan
> >
> > 2011/8/4 Luca Meloni <[email protected]>
> >
> >
> >
> >
> >
> >
> >
> > > I have two servlets in my project:
> > > - The login servlet tooks the username and the password, checks if
> > > user data is correct and eventually returns the name of the related
> > > database;
> > > - The debug servlet for now can only output a string.
> > > In MainEntryPoint I call the login servlet before the debug servlet,
> > > but I get an output that indicates that the debug servlet is called
> > > before the login servlet; this is the code snippet:
> >
> > > logInService.logIn(userNameTextBox.getText(),
> > > passWordTextBox.getText(), new AsyncCallback<String>() {
> >
> > > @Override
> > > public void onFailure(Throwable caught) {
> > > Window.alert("Log in failed!");
> > > }
> >
> > > @Override
> > > public void onSuccess(String result) {
> > > dataBaseString = result;
> > > }
> > > });
> >
> > > deBugService.outPut("2) DataBase: " +
> > > dataBaseString, new AsyncCallback<Void>() {
> >
> > > public void onFailure(Throwable caught) {
> > > }
> >
> > > public void onSuccess(Void result) {
> > > }
> > > });
> >
> > > And this is the related output:
> >
> > > 2) DataBase: null
> > > 1) DataBase: dataBaseName
> >
> > > On Aug 4, 4:00 pm, Juan Pablo Gardella <[email protected]>
> > > wrote:
> > > > "Is it necessary to include also Hibernate
> > > > Validator?" No exactly hibernate validator, some jsr303
> implementation. I
> > > > think is necesary.
> >
> > > > "I tried to run again the project but the servlets were not
> > > > executed in the correct order"
> >
> > > > I'm blind. Can you explain a little more your problem?
> >
> > > > Juan
> >
> > > > 2011/8/4 Apocalypto <[email protected]>
> >
> > > > > Thanks for the reply, I included "validation-api-1.0.0.GA.jar" and
> > > > > "validation-api-1.0.0.GA-sources.jar" to project libraries and the
> > > > > errors were solved. Is it necessary to include also Hibernate
> > > > > Validator? I tried to run again the project but the servlets were
> not
> > > > > executed in the correct order
> >
> > > > > On Aug 4, 1:48 pm, Juan Pablo Gardella <
> [email protected]>
> > > > > wrote:
> > > > > > Its a classpath issue:
> >
> > > > > > [ERROR] Line 97: ConstraintViolation cannot be resolved
> to a
> > > > > > type
> >
> > > > > > Add the javax.validation
> > > > > > jar<
> > > > >
> http://mvnrepository.com/artifact/javax.validation/validation-api/1.0..
> > > .>
> > > > > > (jsr303)
> > > > > > and some implementation<
> > > > >
> http://stackoverflow.com/questions/1384968/is-there-an-implementation..
> > > .>
> > > > > > .
> >
> > > > > > Juan
> >
> > > > > > 2011/8/3 Apocalypto <[email protected]>
> >
> > > > > > > Hello GWT world, I'm a student who is trying to learn how to
> > > develop
> > > > > > > with GWT framework. I already know well Java language but I'm
> stuck
> > > > > > > with my first application: it's a simple log in interface which
> > > stores
> > > > > > > user data into cookies, but I can't understand why it doesn't
> work
> > > > > > > properly.
> >
> > > > > > > MainEntryPoint
> >
> > > > > > > private GWTLogInServiceAsync logInService =
> > > > > > > GWT.create(GWTLogInService.class);
> > > > > > > private GWTDeBugServiceAsync deBugService =
> > > > > > > GWT.create(GWTDeBugService.class);
> > > > > > > private String dataBaseString;
> > > > > > > ...
> > > > > > > logInButton.addClickHandler(new ClickHandler() {
> >
> > > > > > > public void onClick(ClickEvent event) {
> > > > > > > dataBaseString = null;
> >
> > > > > > >
> logInService.logIn(userNameTextBox.getText(),
> > > > > > > passWordTextBox.getText(), new AsyncCallback<String>() {
> >
> > > > > > > @Override
> > > > > > > public void onFailure(Throwable caught)
> {
> > > > > > > Window.alert("Log in failed!");
> > > > > > > }
> >
> > > > > > > @Override
> > > > > > > public void onSuccess(String result) {
> > > > > > > dataBaseString = result;
> > > > > > > }
> > > > > > > });
> >
> > > > > > > deBugService.outPut("2) DataBase: " +
> > > > > > > dataBaseString, new AsyncCallback<Void>() {
> >
> > > > > > > public void onFailure(Throwable caught)
> {
> > > > > > > }
> >
> > > > > > > public void onSuccess(Void result) {
> > > > > > > }
> > > > > > > });
> >
> > > > > > > if (dataBaseString != null) {
> > > > > > > logIn(userNameTextBox.getText(),
> > > > > > > dataBaseString);
> > > > > > > }
> > > > > > > }
> > > > > > > });
> > > > > > > ...
> > > > > > > private void logIn(String userName, String dataBase) {
> > > > > > > Cookies.setCookie("userName", userName);
> > > > > > > Cookies.setCookie("dataBase", dataBase);
> >
> > > > > > > Location.reload();
> > > > > > > }
> >
> > > > > > > GWTLogInServiceImpl
> >
> > > > > > > public String logIn(String userName, String passWord) {
> > > > > > > String dataBase = null;
> >
> > > > > > > try {
> > > > > > > Class.forName("org.postgresql.Driver");
> >
> > > > > > > Connection connection =
> > > > > > >
> DriverManager.getConnection("jdbc:postgresql://localhost:5432/User
> > > > > > > DataBase", postGreSQLUserName, postGreSQLPassWord);
> >
> > > > > > > String query = "SELECT \"DataBase\" FROM \"User\"
> WHERE
> > > > > > > \"Name\" = '" + userName + "' AND \"PassWord\" = '" + passWord
> +
> > > "'";
> >
> > > > > > > ResultSet resultSet =
> > > > > > > connection.createStatement().executeQuery(query);
> >
> > > > > > > if (resultSet.next()) {
> > > > > > > dataBase = resultSet.getString("DataBase");
> > > > > > > }
> > > > > > > } catch (Exception exception) {
> > > > > > > exception.printStackTrace();
> > > > > > > }
> >
> > > > > > > System.out.println("1) DataBase: " + dataBase);
> >
> > > > > > > return dataBase;
> > > > > > > }
> >
> > > > > > > GWTDeBugServiceImpl
> >
> > > > > > > public void outPut(String string) {
> > > > > > > System.out.println(string);
> > > > > > > }
> >
> > > > > > > I get the following output:
> > > > > > > 2) DataBase: null
> > > > > > > 1) DataBase: dataBaseName
> >
> > > > > > > Why does it execute GWTDeBugService before GWTLogInService? I'm
> > > using
> > > > > > > NetBeans 6.9.1 with the latest GWT framework and GWT4NB plugin.
> > > > > > > In addition, during compilation I get the following errors:
> > > > > > > Validating newly compiled units
> > > > > > > [ERROR] Errors in
> 'jar:file:/{projectFolder}/lib/GWT2.3.0/gwt-
> > > > > > > user.jar!/com/google/gwt/editor/client/EditorDriver.java'
> > > > > > > [ERROR] Line 20: The import
> > > > > > > javax.validation.ConstraintViolation cannot be resolved
> > > > > > > [ERROR] Line 97: ConstraintViolation cannot be resolved
> to
> > > a
> > > > > > > type
> > > > > > > [ERROR] Errors in
> 'jar:file:/{projectFolder}/lib/GWT2.3.0/gwt-
> > > > > > > user.jar!/com/google/gwt/editor/client/impl/
> > > > > > > AbstractSimpleBeanEditorDriver.java'
> > > > > > > [ERROR] Line 28: Name clash: The method
> > > > > > > setConstraintViolations(Iterable<ConstraintViolation<?>>) of
> type
> > > > > > > BaseEditorDriver<T,E> has the same erasure as
> > > > > > > setConstraintViolations(Iterable<ConstraintViolation<?>>) of
> type
> > > > > > > EditorDriver<T> but does not override it
> > > > > > > [ERROR] Errors in
> 'jar:file:/{projectFolder}/lib/GWT2.3.0/gwt-
> > > > > > >
> user.jar!/com/google/gwt/editor/client/impl/BaseEditorDriver.java'
> > > > > > > [ERROR] Line 31: The import
> > > > > > > javax.validation.ConstraintViolation cannot be resolved
> > > > > > > [ERROR] Line 67: ConstraintViolation cannot be resolved
> to
> > > a
> > > > > > > type
> > > > > > > [ERROR] Errors in
> 'jar:file:/{projectFolder}/lib/GWT2.3.0/gwt-
> > > > > > >
> user.jar!/com/google/gwt/editor/client/impl/SimpleViolation.java'
> > > > > > > [ERROR] Line 25: The import
> > > > > > > javax.validation.ConstraintViolation cannot be resolved
> > > > > > > [ERROR] Line 40: ConstraintViolation cannot be resolved
> to
> > > a
> > > > > > > type
> > > > > > > [ERROR] Line 43: ConstraintViolation cannot be resolved
> to
> > > a
> > > > > > > type
> > > > > > > [ERROR] Line 44: Missing code implementation in the
> > > compiler
> > > > > > > [ERROR] Line 49: ConstraintViolation cannot be resolved
> to
> > > a
> > > > > > > type
> > > > > > > [ERROR] Line 49: Missing code implementation in the
> > > compiler
> > > > > > > [ERROR] Line 70: ConstraintViolation cannot be resolved
> to
> > > a
> > > > > > > type
> > > > > > > [ERROR] Line 72: ConstraintViolation cannot be resolved
> to
> > > a
> > > > > > > type
> > > > > > > [ERROR] Line 73: ConstraintViolation<?> cannot be
> resolved
> > > to
> > > > > > > a type
> > > > > > > [ERROR] Line 77: ConstraintViolation<capture#2-of ?>
> cannot
> > > > > > > be resolved to a type
> > > > > > > [ERROR] Line 81: ConstraintViolation<capture#3-of ?>
> cannot
> > > > > > > be resolved to a type
> > > > > > > [ERROR] Line 89: ConstraintViolation<capture#4-of ?>
> cannot
> > > > > > > be resolved to a type
> > > > > > > [ERROR] Line 93: ConstraintViolation<capture#5-of ?>
> cannot
> > > > > > > be resolved to a type
> > > > > > > [ERROR] Line 98: ConstraintViolation cannot be resolved
> to
> > > a
> > > > > > > type
> > > > > > > [ERROR] Errors in
> >
> > ...
> >
> > read more ยป
>
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