在servlet中重定向或转发相同的jsp页面

Question

我有一个.jsp页，正在其中添加字段数据库。我写了一些servlet。当我单击添加按钮时，servlet正在运行，但是没有发送我的.jsp页面。我想发送相同的.jsp页面。

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

        String username=request.getParameter("addUsername");
        String password=request.getParameter("addPassword");
        String page="";
        String url="http://localhost:8983/solr/adminCore";
        SolrClient solr=new HttpSolrClient.Builder(url).build();
        ((HttpSolrClient) solr).setParser(new XMLResponseParser());
        SolrInputDocument doc=new SolrInputDocument();
        doc.addField("id", UUID.randomUUID().toString());
        doc.addField("userName", username);
        doc.addField("password", password);
        try {
            solr.add(doc);
            UpdateResponse updateResponse=solr.commit();
            PrintWriter out=response.getWriter();
            response.setContentType("text/html");  
            out.println("<script type=\"text/javascript\">");  
            out.println("alert('Adding an administration account is successful!');");  
            out.println("</script>");
            out.close();


        } catch (SolrServerException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally {
            page="upload.jsp";

        }

            request.getRequestDispatcher("upload.jsp").forward(request, response);

        //doGet(request, response);
    }

}

这是我的servlet代码。它给了我这个错误

Cannot call forward after the response has been committed