如何使用doPOST中类似window.open（）的东西

Question

我想在浏览器的新空白处打开pdf文件：

 String sCommand = GWT.getHostPageBaseURL() + "requiredPDF?vCompanyName="+ companyName + "&" +
                        "vCurDate=" + new Date().getTime() + "&" +
                        sTitle +
                        "vReportType=" + rt.reportType +"&" +
                        "vChartType=" + rt.iChartType +"&" +
                        sParameters +
                        "vDetalization=" + rt.detalization + "&" +
                        "vGroup=" + getCheckedGroups();

 Window.open(sCommand,"", "");

这很好用。但是，我想使用doPOST方法，据我所知，Window.open（）只能用于doGET方法。我已经为doPOST寻找了一些问题，但它们没有在新浏览器的空白/窗口中打开结果。

如何使用doPOST方法在新浏览器的空白处显示结果？

---

UPD。我将我的代码更改为与doPOST绑定而不是window.open（），但没有任何事情发生

 String sURL = GWT.getHostPageBaseURL() + "requirePDF";
 String sData = "vCompanyName="+ companyName + "&" +
                "vCurDate=" + new Date().getTime() + "&" +
                sTitle +
                "vReportType=" + rt.reportType +"&" +
                "vChartType=" + rt.iChartType +"&" +
                sParameters +
                "vDetalization=" + rt.detalization + "&" +
                "vGroup=" + getCheckedGroups();

 RequestBuilder builder = new RequestBuilder(RequestBuilder.POST, sURL);
 builder.sendRequest(sData, new RequestCallback() {
                    @Override
                    public void onResponseReceived(Request request, Response response) {
                        FormPanel formPanel = new FormPanel();
                        formPanel.setAction(GWT.getHostPageBaseURL() + "requirePDF");
                        formPanel.setMethod(FormPanel.METHOD_POST);
                        //formPanel.submit();
                        formPanel.setVisible(true);
                        rt.add(formPanel);

                    }

                    @Override
                    public void onError(Request request, Throwable exception) {
                        MessageBox.alert("Request error","The page doesn't open", null);
                    }
                });