怎麼會出現 Cannot forward after response has been committed？？？

wangdj2008發表於2007-02-20
原文網址 : http://jdon.com/30998
ForwardMIT
下面這個是難使用者的servlet：
package com.wdj;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class CheckLogin extends HttpServlet{
public void doGet(HttpServletRequest request,HttpServletResponse response)throws IOException,ServletException{
User u=new User();
String path=null;
u.setName(request.getParameter("name"));
u.setPass(request.getParameter("pass"));
if(u.isValidate()){
path="main.jsp";
}else{
path="error.jsp";
}
request.getRequestDispatcher(path).forward(request,response);
}
public void doPost(HttpServletRequest request,HttpServletResponse response)throws IOException,ServletException{
this.doGet(request,response);
}

}


下面這個是過濾器;
package com.wdj;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class UserFilter implements Filter{
public void init(FilterConfig congif)throws ServletException{

}
public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain)throws IOException,ServletException{
String name=request.getParameter("name");

if(name!=null){
if(name.indexOf("SEX")==-1){
chain.doFilter(request,response);
}else{
System.out.println("error");
request.getRequestDispatcher("error.jsp").forward(request,response);
}
chain.doFilter(request,response);
}else{
chain.doFilter(request,response);
}
}
public void destroy(){
}
}
我一提交表單到servlet中就提示 Cannot forward after response has been committed？？？
請問我該怎麼改呢，謝謝了，給大家拜個晚年了

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