getOutputStream() has already been called for this response解决方案-Java教程-爱易网页

getOutputStream() has already been called for this response解决方案

日期：2014-05-20　浏览次数：20919 次

getOutputStream() has already been called for this response
我做一个Struts的Demo , 首页面需要输入宠物ID , 密码和验证码 , 全部验证通过后 , 显示宠物的详细信息页面 . 这个功能我是完成了的 ,但是在完成后看到 Myeclipse的 console 中有一个错误信息是这样的

Java code

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.vcode_jsp._jspService(vcode_jsp.java:149)

错误信息中的最后一行指向的我的一个生成验证码的jsp 文件 , 出现上面错误最有可能是在Action 中 ,下面列出action代码

Java code

public ActionForward doLogin(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response) {
        // TODO Auto-generated method stub
        HttpSession session = request.getSession(true);
        
        DynaActionForm dynaAction = (DynaActionForm)form ;
        int petId = ((Integer)dynaAction.get("petId")).intValue();
        String password = dynaAction.getString("petPassword");
        String vCode2 = dynaAction.getString("valiCode");
        String vCode1 = (String)session.getAttribute("vcode");
        PetInfo pet = biz.login(petId, password);        
        if(pet != null && vCode1.equals(vCode1)){
            session.setAttribute("current_pet", pet);
            try {
                response.sendRedirect("ShowBaby.do?id="+petId);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return null ;
        }
        ActionMessages errors = new ActionMessages();
        if(!vCode1.equals(vCode2)){
            errors.add("login_valiCode", new ActionMessage("errors.login.valiCode"));
            super.addErrors(request, errors);
            return mapping.findForward("fail");
        }
        
        errors.add("login_fail", new ActionMessage("errors.login.fail"));
        super.saveErrors(request, errors);
        return mapping.findForward("fail");

------解决方案--------------------
跟你验证码页面有关系

这里是在释放在jsp中使用的对象，会调用response.getWriter(),因为这个方法是和response.getOutputStream()相冲突的！所以会出现以上这个异常。

解决的办法:
在使用完输出流以后调用以下两行代码即可：
out.clear();
out = pageContext.pushBody();
------解决方案--------------------
http://www.blogjava.net/pengpenglin/archive/2008/08/19/176532.html

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getOutputStream() has already been called for this response解决方案

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