我正在努力开发一项服务.
关键是我的index.xhtml应该从HTTP Request获取参数(POST和GET)和cookie.
我尝试与< f：Metadata>组合使用和< f：event type =“preRenderView”>像这样：
<f:Metadata> <f:event type="preRenderView" listener="#{deConversation.start}"/> </f:Metadata>
deConversation.start的代码：
public void start(ComponentSystemEvent event) {
System.out.println("checkLogin");
HttpServletRequest request = SsoHelper.getRequest();
String requestSessId = SsoHelper.getRequestSessionId(request);
String requestRedirect = SsoHelper.getRequestRedirect(request);
System.out.println("sessId " + requestSessId);
if (requestRedirect == null || requestRedirect.isEmpty()) {
requestRedirect = "self";
}
if (requestSessId != null) {
trySessId(requestSessId,requestRedirect);
}
externalResourcesHandler.setExternalRedirect(requestRedirect);
tryToBeginConversation();
if (!isAuthorized()) {
SsoHelper.performNavigation("auth");
}
}
SsoHelper只提供这样的api：
public static String getRequestSessionId(HttpServletRequest request) {
Map<String,Object> cookieMap = FacesContext.getCurrentInstance().getExternalContext().getRequestCookieMap();
String requestDeSessionId = null;
if (cookieMap.containsKey("de_session_id")) {
requestDeSessionId = ((Cookie) cookieMap.get("de_session_id")).getValue();
}
return requestDeSessionId;
}
public static String getRequestRedirect(HttpServletRequest request) {
return getRequestParam(request,"redirect","self");
}
public static String getRequestExternalCss(HttpServletRequest request) {
return getRequestParam(request,"externalcss",null);
}
public static String getRequestParam(HttpServletRequest request,String name,String defaultValue) {
String[] paramValues = HttpServletRequestHelper.getParamValues(request,name);
String paramValue = null;
if (paramValues != null && paramValues.length != 0) {
paramValue = paramValues[0];
}
if(paramValue == null){
paramValue = defaultValue;
}
return paramValue;
}
public static HttpServletRequest getRequest() {
return (HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest();
}
public static void performNavigation(String destination) {
FacesContext context = FacesContext.getCurrentInstance();
ConfigurableNavigationHandler handler = (ConfigurableNavigationHandler) context.getApplication().getNavigationHandler();
handler.performNavigation(destination);
}
关键是我无法在方法start()中获得任何POST参数或cookie.我只能获得GET参数.
使用< f：event type =“preRenderView”>？读取cookie和POST参数是否有可能？
解决方法
我认为您应该使用@PostConstruct调用init方法,以便在页面呈现之前调用init()&使用全局变量在变量中分配Session或Cookies值,以便您可以实现您的要求.
例：
@PostConstruct
public void init(){
// Your Response
Map request = (Map)FacesContext.getCurrentInstance().getExternalContext().getResponse();
request.get("Your Key");
// Cookies
Map cookie = FacesContext.getCurrentInstance().getExternalContext().getRequestCookieMap();
cookie.get("Your Key");
Map session = FacesContext.getCurrentInstance().getExternalContext().getSessionMap();
session.get("Your Key");
}
尝试这个我认为它会帮助你.
