从jsf重定向？ [英] redirect from jsf?

问题描述

我正在为我的大学项目申请jsp，jstl和jsf，据说，我对jsf也很新。

I am working on application with jsp, jstl and jsf for my college project, thats being said, I am as well very new to jsf.

一切都在进行到目前为止很棒。但是，我似乎有一个问题，想知道如何从托管bean重定向到dinamyc参数的页面。
例如 article.jsp？article_id = 2

Everything is going great so far. However, I seems to have a problem figuring out how to do redirect from managed bean to page with dinamyc parameters. For example article.jsp?article_id=2

有人可以告诉我它是如何完成的吗？

Can somebody tell me how it is done ?

我一直在尝试使用像

FacesContext.getCurrentInstance().getExternalContext().dispatch("faces/article.jsp2?article_id=" + articleId);

但得到错误：

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)

我一直在尝试使用

response.sendRedirect("faces/article.jsp2?article_id=" + articleId);
            return;

但又一次出错。

javax.servlet.ServletException: Cannot forward after response has been committed
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:256)

有人可以告诉我在使用jsf时如何从托管java bean重定向？

Can somebody please tell me how do i redirect from managed java bean when working with jsf ?

Bellow是我的代码（可能是错误的，这就是为什么重定向不起作用）。

Bellow is my code (maybe something wrong with that and thats why redirect not working).

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;
        }

提前谢谢。

推荐答案

如果有人会遇到同样的问题。

In case some one will run into same problem.

这就解决了我的问题：

FacesContext.getCurrentInstance().getExternalContext().redirect("article.jsp?article_id=" + articleId);

这篇关于从jsf重定向？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！