如何从xhtml中的commandButton重定向到Servlet [英] how to redirect to a Servlet from a commandButton in xhtml

问题描述

我已经麻烦了几天了.希望这会更清洁，以前做过此事的人可以帮助我！

I've been having this trouble for a couple of days. hopefully this is cleaner and someone who's done this before can help me out!

我正在Tomcat 7.0服务器上运行的Eclipse中使用JSF 2.0构建WebApp.并做了一个我想去的servlet，但是我不知道如何分配导航规则来带我去那里:

I'm building a webApp with JSF 2.0 in Eclipse running on a tomcat 7.0 server. and have made a servlet I want to go to, but I don't know how to thandle the navigation rules to take me there:

在我的项目中，路径为src/com/servlets/PdfServlet，因此，当我在服务器上运行项目时，可以通过localhost:8080/miloWeb/PdfServlet来访问该servlet. servlet实际上会为我创建一个Pdf文件并显示它.

In my project the path is src/com/servlets/PdfServlet so when I run the project on the server this servlet can be accessed through the url localhost:8080/miloWeb/PdfServlet. the servlet actualy creates a Pdf file for me and displays it.

无论如何，我的xhtml都有:

anyway my xhtml has this:

<h:commandButton id="reportButton"  action="reportPdf" styleClass="button" value="get Report" ></h:commandButton>

我的faces-config导航规则如下:

my faces-config navigation rules look like this:

<navigation-rule>
    <navigation-case>
        <from-outcome>reportPdf</from-outcome>      
        <to-view-id>/miloWeb/PdfServlet</to-view-id>
        <redirect />
    </navigation-case>
</navigation-rule>

但是我需要带我去miloWeb/faces/miloWeb/PdfServlet，并且我需要带我去miloWeb/PdfServlet.

but it takes me to miloWeb/faces/miloWeb/PdfServlet, and I need it to take me to miloWeb/PdfServlet.

关于如何完成此操作，其他路线或执行操作的任何想法?

Any ideas on how to accomplish this, or another route or doing this ?

推荐答案

首先，导航规则仅适用于JSF.他们无法帮助您导航到servlet.

First of all, the navigation rule is for JSF only. They can't help you to navigate to a servlet.

faces-config中的导航规则在JSF2.0中是多余的.它们由JSF隐式处理，基于操作方法返回的值(结果).可以将"?faces-redirect=true"附加到结果的末尾以进行重定向.

The navigation rules in faces-config are redundant in JSF2.0. They are implicitly handled by JSF, based on the value (outcome) returned by an action method. "?faces-redirect=true" can be attached to the end of the outcome for redirection.

我不知道您的功能要求是什么.您正在尝试将JSF和servelts混合使用，这不是一个好主意.

I don't know what your functional requirement is. You are trying to mix JSF and servelts, which is not a very good idea.

<h:commandButton id="reportButton"  action="reportPdf"

action属性的值必须是解析为某些JSF托管bean中的方法的方法表达式.例如action="#{controllerBean.axnMethod()}".

The value of the action attribute must be a method expression that resolves to a method in some JSF managed bean. e.g. action="#{controllerBean.axnMethod()}".

调用axnMethod()时，一种选择是从那里重定向到servlet.如下:

When the axnMethod() is called, one option is to redirect from there to the servlet. The is something as follows:

FacesContext.getCurrentInstance().getExternalContext().redirect("url");

或者，要求只是调用servlet，然后在视图上，只需放置一个带有调用servlet的url的链接.

Or, requirement is just to invoke the servlet then on the view, just put a link with the url that invokes the servlet.

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