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JSF 面试题与答案

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问题 11. How to pass a parameter to the JSF application using the URL string?

if you have the following URL: http://your_server/your_app/product.jsf?id=777, you access the passing parameter id with the following lines of java code:

FacesContext fc = FacesContext.getCurrentInstance();
String id = (String) fc.getExternalContext().getRequestParameterMap().get("id");
From the page, you can access the same parameter using the predefined variable with name param. For example,

<h:outputText value="#{param['id']}" />
Note: You have to call the jsf page directly and using the servlet mapping.

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问题 12. How to add context path to URL for outputLink?

Current JSF implementation does not add the context path for outputLink if the defined path starts with '/'. To correct this problem use #{facesContext.externalContext.requestContextPath} prefix at the beginning of the outputLink value attribute. For For Example:

<h:outputLink value=”#{facesContext.externalContext.requestContextPath}/myPage.faces”> 



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问题 13. How to get current page URL from backing bean?

You can get a reference to the HTTP request object via FacesContext like this:

FacesContext fc = FacesContext.getCurrentInstance();
HttpServletRequest request = (HttpServletRequest) fc.getExternalContext().getRequest();

and then use the normal request methods to obtain path information. Alternatively,

context.getViewRoot().getViewId();
will return you the name of the current JSP (JSF view IDs are basically just JSP path names).

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问题 14. How to access web.xml init parameters from java code?

You can get it using externalContext getInitParameter method. For example, if you have:

<context-param>
<param-name>connectionString</param-name>
<param-value>jdbc:oracle:thin:scott/tiger@cartman:1521:O901DB</param-value>
</context-param>
You can access this connection string with:

FacesContext fc = FacesContext.getCurrentInstance();
String connection = fc.getExternalContext().getInitParameter("connectionString");

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问题 15. How to access web.xml init parameters from jsp page?

You can get it using initParam pre-defined JSF EL valiable.

For example, if you have:

<context-param>
<param-name>productId</param-name>
<param-value>2004Q4</param-value>
</context-param>
You can access this parameter with #{initParam['productId']} . For example:

Product Id: <h:outputText value="#{initParam['productId']}"/>

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