JSF redirect to other page

问题:

I have three XHTML pages;

1. index.xhtml
2. page_1.xhtml
3. page_2.xhtml

In the index.xhtml page, I have a commandButton which sends the user to page_1.xhtml. All this is done in the navigation rule in faces-config.xml.

How would I redirect the user to page_2.xhtml from the index.xhtml using another commandButton assuming that both commandButtons' actions are linked to a backing Java class?

回答1:

Just bind the buttons to different action methods which each return a different outcome.

<h:commandButton value="Go to page 1" action="#{bean.goToPage1}" />
<h:commandButton value="Go to page 2" action="#{bean.goToPage2}" />

with

public String goToPage1() {
    // ...
    return "page_1";
}

public String goToPage2() {
    // ...
    return "page_2";
}

Navigation cases are not necessary. JSF 2.0 supports implicit navigation. The navigation outcome can just be the path/filename of the desired target view. The file extension in the outcome is optional.

If you don't necessarily need to perform any business action on navigation, or you can do it in the (post)constructor of the backing bean of the target page instead, then you can also just put the outcome value in the action directly.

<h:commandButton value="Go to page 1" action="page_1" />
<h:commandButton value="Go to page 2" action="page_2" />

A <h:commandButton> will however not perform a redirect, but a forward. The enduser won't see the URL being changed in the browser address bar. The target page isn't bookmarkable. If you can, I'd suggest to use <h:button> instead.

<h:button value="Go to page 1" outcome="page_1" />
<h:button value="Go to page 2" outcome="page_2" />

Or if you really need to invoke a business action, but would like to perform a real redirect, then append faces-redirect=true as query string to the outcome value.

public String goToPage1() {
    // ...
    return "page_1?faces-redirect=true";
}

public String goToPage2() {
    // ...
    return "page_2?faces-redirect=true";
}

See also:

• Communication in JSF 2.0 - Implicit navigation
• When should I use h:outputLink instead of h:commandLink?

回答2:

You can also do this, in any part of your code to be redirected to "example.xhtml"

ExternalContext ec = FacesContext.getCurrentInstance()
        .getExternalContext();
try {
    ec.redirect(ec.getRequestContextPath()
            + "/faces/jsf/example.xhtml");
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

回答3:

Add two navigation cases as shown below. In the action methods, return outcomes corresponding to the buttons.

            <navigation-rule>
                <from-view-id>index.html</from-view-id>
                <navigation-case>
                    <from-outcome>page1</from-outcome>
                    <to-view-id>page_1.xhtml</to-view-id>
                </navigation-case>
                <navigation-case>
                    <from-outcome>page2</from-outcome>
                    <to-view-id>page_2.xhtml</to-view-id>
                </navigation-case>
            </navigation-rule>