我正在尝试开发一项服务。
重点是我的 index.xhtml 应该从 HTTP 请求中获取参数(POST 和 GET)和 cookie。
我尝试与 <f:metadata>
结合使用和 <f:event type="preRenderView">
像这样:
<f:metadata>
<f:event type="preRenderView" listener="#{deConversation.start}"/>
</f:metadata>
deConversation.start 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 只是提供这样的 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);
}
重点是我无法在方法 start() 中获取任何 POST 参数或 cookie。我只能获取 GET 参数。
是否可以使用 <f:event type="preRenderView">
读取 cookie 和 POST 参数? ?
最佳答案
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() 并采用全局变量为变量分配 Session 或 Cookies 值,从而实现您的要求。
例子:
@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");
}
试试这个,我认为它会对你有帮助。
关于java - JSF 2.0。无法在 preRenderView 事件处理程序中获取 POST 参数和 cookie,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13271113/