.exe文件不在jsp页面中打印输出

Question

我有一个.exe文件，它通过点击jsp页面上的按钮启动和停止。当我们点击jsp页面上的按钮时，.exe文件启动，其日志被放在.txt文件中。例如，我的txt文件位于C：\ Debug \ logfile.txt.My问题是，当我单击启动时，.exe文件正在启动，其数据显示在指定的日志文件中，但输出未打印在jsp页面上。如果停止.exe文件，日志既会显示在指定的日志文件中，也会显示在jsp页面上。请帮助我解决这个问题。下面是停止和启动.exe文件的代码片段。

用于启动exe文件的servlet：

protected void doGet(HttpServletRequest req, HttpServletResponse res) throws 
IOException {

             try{



                  String browsefile = req.getParameter("browsefile");

                  if(browsefile == null || browsefile.equals("")){

                      throw new ServletException("File Name can't be 
null or empty");

                  }

                  File file = new File("C:/lic/test.lic");

                  if(!file.exists()){

                      throw new ServletException("File doesn't exists 
on server.");

                  }

                 res.setContentType("text/html;charset=UTF-8");  
                    PrintWriter out = res.getWriter();

                    Runtime rt = Runtime.getRuntime();
                    Process pr = rt.exec("C:\\tools\\server\\grd.exe -l[+]  
C:\\Debug\\logfile.txt" );

                    BufferedReader stdInput = new BufferedReader(new 
InputStreamReader(pr.getInputStream()));
                    BufferedReader input = new BufferedReader(stdInput);
                    String serverstarted="";
                    StringBuffer startOutput = new StringBuffer();
                            while((serverstarted = input.readLine()) != 
null){
                                startOutput.append
(serverstarted      + "\n");
                            }

                            req.setAttribute("startOutput", 
startOutput.toString());
                            req.getRequestDispatcher
("grdoptions.jsp").forward(req, res);
                }catch (Throwable t)  
                  {  
                    t.printStackTrace();  
                  }  


                finally {  

                }  }

}

用于停止.exe文件的Servlet：

protected void doGet(HttpServletRequest req, HttpServletResponse res) throws 
IOException {

             try{

                  res.setContentType("text/html;charset=UTF-8");  
                  PrintWriter out = res.getWriter();

                  Runtime rt = Runtime.getRuntime();
                  Process pr = rt.exec("cmd /c taskkill /F /IM grd.exe");

                  BufferedReader stdInput = new BufferedReader(new 
InputStreamReader(pr.getInputStream()));
                  BufferedReader input = new BufferedReader(stdInput);
                    String stop="";
                    StringBuffer stopOutput = new StringBuffer();
                            while((stop = input.readLine()) != null){
                                //out.println(stop);
                                stopOutput.append(stop + "\n");
                            }

                            req.setAttribute("stopOutput", 
stopOutput.toString());
                            req.getRequestDispatcher
("grdoptions.jsp").forward(req, res);

                  //  out.println("Command has been stopped");


                }catch (Throwable t)  
                  {  
                    t.printStackTrace();  
                  }  


                finally {  

                }  }

}

jsp代码：

<table cellspacing="5" cellpadding="1" border="0">
    <tr>
            <td>Start Server</td>
            <td>
            <div id="start">
            <form action="start" METHOD="GET" 
enctype="multipart/form-data">
            <input type="file" name=browsefile size="150" />
            <input type="submit" name="start" 
value="StartServer" />
            </form>
            </div>
            <div id="result">
                            <pre>
    ${requestScope.startOutput}
</pre>
                        </div>
            </td>
            </tr>
    </table>
    <BR>

    <table cellspacing="5" cellpadding="1" border="0">
    <tr>
            <td>Stop Server</td>
            <td>
            <div id="stop">
            <form action="stop" METHOD="GET">
                <input type="submit" name="txtSubmit2" 
id="txtSubmit" value="StopServer" />
            </form>
            </div>
            <div id="result">
                            <pre>
    ${requestScope.stopOutput}
</pre>
                        </div>
            </td>
            </tr>
    </table>

WEB.XML：

<servlet>       
    <servlet-name>Start</servlet-name>
    <servlet-class>com.abc.def.lic.Start</servlet-class>

</servlet>
<servlet>       
    <servlet-name>Stop</servlet-name>
    <servlet-class>com.abc.def.lic.Stop</servlet-class>
</servlet>

    <servlet-mapping>
    <servlet-name>Start</servlet-name>
    <url-pattern>/start</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>Stop</servlet-name>
    <url-pattern>/stop</url-pattern>
</servlet-mapping>

我想到的是使用Process pr = rt.exec（“C：\ tools \ server \ grd.exe -l [+]
    C：\ Debug \ logfile.txt“）; 启动exe文件并在logfile.txt中打印数据，这会阻止输出在jsp页面上打印。如果我删除-l [+] C：\ Debug \ logfile.txt，它将在网页上打印输出。但是我需要在网页和logfile.txt上输出。任何建议都是适用的。