问题：getOutputStream() has already been called

2009-9-14 16:16:54 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet jsp threw exception
java.lang.IllegalStateException: getOutputStream() has already been called for this response
 at org.apache.catalina.connector.Response.getWriter(Response.java:610)
 at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198)
 at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:125)
 at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:118)
 at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:186)
 at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:118)
 at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:77)
 at org.apache.jsp.index_jsp._jspService(index_jsp.java:83)
……

  

 

java.lang.IllegalStateException: getOutputStream() has already been called for this response
这是我当前碰到的异常，此异常非一般的图片验证码输出流之类的，

产生缘由：输入顶级或二级域名，自定义标签处理（标签核心代码见下），然后跳转到相应 Action，action里面若没有静态页就重新生成一遍，若有的话就直接跳转去访问静态页

 

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 try {
   RequestDispatcher rs = request.getSession().getServletContext().getRequestDispatcher(todo);
   rs.forward(request, response);
  } catch (IOException e) {
   e.printStackTrace();
   this.forword(request, response, URLForHomeSiteIndex);
  }