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<HEAD><TITLE>FAQ汇萃 >> Servlet >> Can I invoke a JSP error page from a servlet?</title>
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>> Can I invoke a JSP error page from a servlet? [<a href=http://www.jsp001.com/forum/showthread.php?goto=newpost&threadid=290>查看别人的评论</a>]<br>

<hr><p>由 webmaster 发布于: 2001-02-05 16:13</p><p><img src="images/icons/icon14.gif" alt="Thumbs up" border=0> </p><p>Yes, you can invoke the JSP error page and pass the exception object to it from within a servlet. <font color=red>The trick is to create a request dispatcher for the JSP error page, and pass the exception object as a javax.servlet.jsp.jspException request attribute. However, note that you can do this from only within controller servlets.</font> If your servlet opens an OutputStream or PrintWriter, the JSP engine will throw the following translation error: <br><br>java.lang.IllegalStateException: <br>  Cannot forward as OutputStream or Writer has already been obtained<br><br>The following code snippet demonstrates the invocation of a JSP error page from within a controller servlet: <br><br><br>protected void sendErrorRedirect(HttpServletRequest request,<br>   HttpServletResponse response, String errorPageURL, <br>   Throwable e)<br>       throws ServletException, IOException {<br>    request.setAttribute ("javax.servlet.jsp.jspException", e);<br>    getServletConfig().getServletContext().<br>     getRequestDispatcher(errorPageURL).forward(request, <br>       response);<br>}<br><br>public void doPost(HttpServletRequest request,<br>   HttpServletResponse response) {<br> try {<br> // do something<br> } catch (Exception ex) {<br>  try {<br>   sendErrorRedirect(request,response,"/jsp/MyErrorPage.jsp",ex);<br>  } catch (Exception e) {<br>   e.printStackTrace();<br>  }<br> }<br>}<br><br></p></td>
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