JSF-PrimeFaces-如何截取p：MenuItem结果

Question

更新：这里是我目前的方法/想法。听起来很麻烦，但可能有用。虽然，更好的实施方式是受欢迎的--

我正在考虑使用一个过滤器，就像BalusC在这里描述的那样

我如何从过滤器中读取JSF会话bean？

ExternalContext context = FacesContext.getCurrentInstance().getExternalContext();
List<String> pages = getResources("/private", ".xhtml");
for (String page : pages) {
    try {
        System.out.println(page);
        System.out.println(getMetaData(context.getResourceAsStream(page)));
    } catch (Exception e) {
        e.printStackTrace();
    }
}
return pages;

哪里

private List<String> getResources(String path, String suffix) {
    ExternalContext context = FacesContext.getCurrentInstance().getExternalContext();
    Set<String> resources = context.getResourcePaths(path);
    List<String> filteredResources = new ArrayList<String>();
    for (String resource : resources) {
        if (resource.endsWith(suffix)) {
            filteredResources.add(resource);
        } else if (resource.endsWith("/")) {
            filteredResources.addAll(getResources(resource, suffix));
        }
    }
    return filteredResources;
}

（上面的代码借用自这里-https://community.jboss.org/thread/189427)

每个xhtml都有自己的元标记，如[h:head]中的[meta name=“module”content=“security”]

private class MyDefaultHandler extends DefaultHandler{
    private String titleName = null;
    private boolean skip = false;

    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException {
        if (!skip && qName.equalsIgnoreCase("meta")) {
            boolean isThis = false;

            for (int i = 0; i < attributes.getLength(); i++) {

                String attributeName = attributes.getLocalName(i);
                String attributeValue = attributes.getValue(i);
                System.out.println("found attribute with localname=" + attributeName + " and value=" + attributeValue);

                if (attributeName.equals("name") && attributeValue.equals("module")){
                    titleName = attributes.getValue(i);
                    isThis = true;
                    break;
                }
            }

            if (isThis){
                for (int i = 0; i < attributes.getLength(); i++) {
                    String attributeName = attributes.getLocalName(i);
                    String attributeValue = attributes.getValue(i);

                    if (attributeName.equals("content")){
                        titleName = attributeValue;
                        skip = true;
                        break;
                    }
                }
            }
        }
    }

    public String getTitleName(){
        return titleName;
    }
}

public String parseTitle(InputStream inputStream) throws ParserConfigurationException, SAXException, IOException {

    XMLReader reader = SAXParserFactory.newInstance().newSAXParser().getXMLReader();

    //if you comment the line below, your parser will take 1 minute EACH XML
    reader.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);

    MyDefaultHandler handler = new MyDefaultHandler();
    reader.setContentHandler(handler);
    InputSource inputSource = new InputSource(new BufferedInputStream(inputStream));
    reader.parse(inputSource);

    return handler.getTitleName();
}

public void doFilter(ServletRequest arg0, ServletResponse arg1,
        FilterChain arg2) throws IOException, ServletException {

    HttpServletRequest request = (HttpServletRequest) arg0;
    HttpServletResponse response = (HttpServletResponse) arg1;
    HttpSession session = ((HttpServletRequest) request).getSession();
    Enumeration<String> names = session.getAttributeNames();
    while(names.hasMoreElements()){
        System.out.println(names.nextElement());
    }
    AuthorizationManagerMB authorizationManagerMB = (AuthorizationManagerMB)session.getAttribute("authorizationManagerMB");
    if (authorizationManagerMB == null){
        System.out.println("Filter = not logged");
    }else{
        System.out.println("Filtering = "+request.getRequestURI());
        authorizationManagerMB.doSomething();
    }

有趣的是，JSF对XHTML的处理方法如此之少。不能列出，不能添加元数据，不能检索元数据。它相当以豆为中心：-）

Answer 1

outpute生成一个简单的GET请求，该请求可以与参数一起使用，并且不需要被窗体包围。为了在服务器端执行一些逻辑，首先需要一个POST。

对于您的具体情况，最好的选择是使用action方法，它让您在导航到新视图之前执行操作。只需执行您想要的操作并返回与您的目标视图匹配的导航结果：

<p:menuitem action="#{bean.changePage(param)}" />

public String changePage(String param){
    //Do some stuff
    return "page2?faces-redirect=true&includeViewParams=true&p1="+param;
}

此外，您必须在目标视图中捕获该参数，并将其设置到bean中：

<f:metadata>
    <f:viewParam name="p1" value="#{destinationBean.param}" />
</f:metadata>