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java - 带有 java.lang.IllegalStateException : Cannot forward after response has been committed 的 Servlet

转载 作者:行者123 更新时间:2023-11-29 03:22:38 31 4
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在我的 servlet 中我有这段代码:

protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub

Utils.CheckSession(request,response);

String op = request.getParameter("op");
int DaysToAdd = request.getParameter("daysToAdd") != null ? Integer.valueOf(request.getParameter("daysToAdd")) : 0;

ArrayList<Giorno> giorni = new ArrayList<Giorno>();

/*HERE I FILL ArrayList giorni and calculate other variables*/


if ("cal".equals(op))
{
request.setAttribute("giorni", giorni);
request.setAttribute("daysToAdd", DaysToAdd);
request.getRequestDispatcher("GestioneCalendario.jsp").forward(request, response);

}
else if("utente".equals(op))
{
// ricavare abbonamento dell'utente
String idu = (String) request.getAttribute("idu");
Abbonamento a = null;
int iDa = Utils.getIdAbbonamentoAttivoUtente(idu);
a = Utils.getAbbonamentoFromId(iDa);
request.setAttribute("abbonamento", a);
request.getRequestDispatcher("Lezioni.jsp").forward(request, response);

}
else
{
request.setAttribute("giorni", giorni);
request.setAttribute("daysToAdd", DaysToAdd);
request.getRequestDispatcher("GestioneLezioniNuovoLayout.jsp").forward(request, response);

}

}

也许问题出在 CheckSession 方法中??

public static void CheckSession(HttpServletRequest request,
HttpServletResponse response) {
// TODO Auto-generated method stub
HttpSession session = request.getSession(true);
String logged = null;
if (session!=null)
logged = (String) session.getAttribute("logined");
if(logged == null)
{
request.setAttribute("errore", "Devi loggarti!");
try {
request.getRequestDispatcher("Admin.jsp")
.forward(request, response);
return;
} catch (ServletException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

但它给了我这个异常(exception):

GRAVE: Servlet.service() for servlet [TakeDates] in context with path [/Spinning] threw     exception
java.lang.IllegalStateException: Cannot forward after response has been committed
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:349)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
at servlet.TakeDates.doGet(TakeDates.java:368)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:695)

用这个 url 调用 servlet

http://localhost:8080/Spinning/TakeDates?op=cal

谁能帮帮我?提前致谢!

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