[英]Can't redirect or dispatch to another page in JSF 2.0
我正在尝试在我的项目中实现登录系统,但还没有成功。 我在项目中使用的是Tomcat 7,Java 6和JSF 2.0,并且总是尝试将用户重定向到另一个页面,但遇到了另一个错误。
以下是login.xhtml
的相关部分:
<h:form id="form-login">
<fieldset>
<div class="form-group">
<label for="login">Login:</label>
<p:inputText styleClass="form-control" autocomplete="off" id="login"
placeholder="Nome de usuário" style="padding: 6px 12px;" required="true"
requiredMessage="Este campo é obrigatório." value="#{loginMBean.login}"/>
</div>
<div class="form-group">
<label for="senha">Senha: </label>
<p:inputText styleClass="form-control" autocomplete="off" id="senha"
type="password" placeholder="Senha" style="padding: 6px 12px;"
required="true" requiredMessage="Este campo é obrigatório."
value="#{loginMBean.password}" />
</div>
<div class="form-actions">
<h:commandButton value="Entrar" styleClass="btn btn-default btn-lg"
action="#{loginMBean.entrar}" />
</div>
</fieldset>
</h:form>
我的loginMBean
:
(String login, string password, this part is okay, already works)
...
public void entrar() throws IOException{
Login loginTentativa = new Login(login, password);
int resultadoValidacao = controle.validaLogin(loginTentativa);
switch (resultadoValidacao) {
case 0:
FacesContext.getCurrentInstance().getExternalContext().dispatch("first/1-dados-escola.xhtml");
case 1:
FacesContext.getCurrentInstance().getExternalContext().redirect("/user/principal.xhtml");
default:
System.out.println("Usuário não autenticado.");
}
}
情况0:用户已通过身份验证,这不是他第一次访问该网站。
情况1:用户已通过身份验证,这是他第一次访问该网站。
情况2:未通过身份验证。
在我的测试中,我遇到了情况1。但是,当我使用“ redirect”时 ,收到以下错误消息:
javax.faces.el.EvaluationException: java.lang.IllegalStateException
javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101)
com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:101)
javax.faces.component.UICommand.broadcast(UICommand.java:315)
javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:791)
javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1256)
com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
当我尝试使用“ dispatch”时 ,我得到了:
javax.faces.el.EvaluationException: java.lang.IllegalStateException: Cannot forward after response has been committed
javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101)
com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:101)
javax.faces.component.UICommand.broadcast(UICommand.java:315)
javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:791)
javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1256)
com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
我做错了什么? :/
我认为您没有在switch中使用break语句,因此如果在case 0之后执行case 1,并且会收到错误“在提交响应后无法转发”,请尝试从此函数返回url,
public String entrar() throws IOException{
Login loginTentativa = new Login(login, password);
String result="";
int resultadoValidacao = controle.validaLogin(loginTentativa);
switch (resultadoValidacao) {
case 0:
result="first/1-dados-escola.xhtml";
break;
case 1:
result="/user/principal.xhtml";
break;
default:
System.out.println("Usuário não autenticado.");
}
return result;
}
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