我正在为我的大学项目开发jsp,jstl和jsf的应用程序,这就是说,我对jsf也很新。从jsf重定向?
到目前为止,一切都很顺利。然而,我似乎有一个问题,搞清楚如何从托管bean重定向到dinamyc参数的页面。 例如article.jsp?article_id=2
有人能告诉我它是怎么做的?
我一直试图用somethinng像
FacesContext.getCurrentInstance().getExternalContext().dispatch("faces/article.jsp2?article_id=" + articleId);
,但得到的错误:
javax.servlet.ServletException: #{postComment.postClick}: javax.faces.FacesException: javax.servlet.ServletException: javax.faces.component.UIViewRoot cannot be cast to com.sun.faces.application.StateManagerImpl$TreeNode
javax.faces.webapp.FacesServlet.service(FacesServlet.java:256)
我一直试图用
response.sendRedirect("faces/article.jsp2?article_id=" + articleId);
return;
但同样得到一个错误。
javax.servlet.ServletException: Cannot forward after response has been committed
javax.faces.webapp.FacesServlet.service(FacesServlet.java:256)
有人能告诉我如何使用jsf工作时从托管java bean重定向?
贝娄是我的代码(也许有什么错,那就是为什么重定向不工作)。
HttpServletRequest request = (HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest();
HttpServletResponse response = (HttpServletResponse) FacesContext.getCurrentInstance().getExternalContext().getResponse();
String articleId = request.getSession().getAttribute("article_id").toString();
//String articleId = request.getParameter("article_id");
String authorName = request.getSession().getAttribute("user_name").toString();
java.util.Calendar calendar = java.util.Calendar.getInstance();
String commentDate = String.valueOf(calendar.get(java.util.Calendar.DAY_OF_MONTH)) + ".";
commentDate += String.valueOf(calendar.get(java.util.Calendar.MONTH)) + ".";
commentDate += String.valueOf(calendar.get(java.util.Calendar.YEAR));
ArrayList error = new ArrayList();
if(commentName.contains("<"))
{
error.add("Comment name contains illegal characters");
}
if(commentBody.isEmpty() && commentBody.contains("<script"))
{
error.add("Your message body contains illegal characters");
}
if(error.size() > 0)
{
request.getSession().setAttribute("error", error);
error.clear();
FacesContext.getCurrentInstance().getExternalContext().dispatch("article.jsp2?article_id=" + articleId);
}
else
{
Comment comment = new Comment();
comment.setCommentAuthor(authorName);
comment.setCommentBody(commentBody);
comment.setCommentDate(commentDate);
comment.setCommentName(commentName);
comment.setArticleId(articleId);
DisplayArticleIO addComment = new DisplayArticleIO();
addComment.postComment(comment);
// FacesContext.getCurrentInstance().getExternalContext().dispatch("faces/article.jsp2?article_id=" + articleId);
response.sendRedirect("faces/article.jsp2?article_id=" + articleId);
return;
}
在此先感谢您。
您列举了一些非常好的建议。 非常感谢,一定会研究它。 – Dmitris 2009-06-10 06:00:28
不用客气:P – laginimaineb 2009-06-10 06:02:53