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抛出此方法

java.lang.IllegalStateException:在提交响应后无法转发

我无法发现问题.有帮助吗？

    int noOfRows = Integer.parseInt(request.getParameter("noOfRows"));
    String chkboxVal = "";
    // String FormatId=null;
    Vector vRow = new Vector();
    Vector vRow1 = new Vector();
    String GroupId = "";
    String GroupDesc = "";
    for (int i = 0; i < noOfRows; i++) {
        if ((request.getParameter("chk_select" + i)) == null) {
            chkboxVal = "notticked";
        } else {
            chkboxVal = request.getParameter("chk_select" + i);
            if (chkboxVal.equals("ticked")) {
                fwdurl = "true";
                Statement st1 = con.createStatement();
                GroupId = request.getParameter("GroupId" + i);
                GroupDesc = request.getParameter("GroupDesc" + i); …