为什么servlet无法转发 出错误？

Question

servlet 代码
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.getRequestDispatcher("index.jsp").forward(request, response);

}页面代码
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.getRequestDispatcher("index.jsp").forward(request, response);



}
错误信息:
2009-11-24 22:16:57 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet login threw exception
java.lang.IllegalStateException: Cannot forward after response has been committed
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:302)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
at com.test.servlet.login.doPost(login.java:84)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)

Answer 1

页面代码 
public void doPost(HttpServletRequest request, HttpServletResponse response) 
throws ServletException, IOException { 
request.getRequestDispatcher("index.jsp").forward(request, response); 
} 这是什么东东？？去掉算了，页面没这种跳转

Answer 2

servlet 代码 
public void doPost(HttpServletRequest request, HttpServletResponse response) 
throws ServletException, IOException { 
request.getRequestDispatcher("/index.jsp").forward(request, response); } 
应该是缺少“/”吧... 

Answer 3

index.jsp应该是缺少“/”吧
有参数传递吗？没有用重定向就行

Answer 4

java.lang.IllegalStateException: Cannot forward after response has been committed 上个帖子回复过了，你 doPost 里面还有操作没有贴出来吧，你把 reponse的流提前释放或则关闭了。再 forword，当然不可以，去看下上面那个帖子。