从Java小程序读取客户端COMPORT

Question

I need to read client comport accessing my JSP based web application. 我需要阅读客户端命令来访问基于JSP的Web应用程序。

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>COMPORT</title>
    </head>
    <body bgcolor="blue">
        <h1>ACCESSING COMPORT</h1>
        <jsp:plugin align="middle" height="500" width="500" type="applet" archive="" code="SunCommSerialPort.class" name="clock" codebase="."/>
    </body>
</html>

This is my Java applet code to read COM port. 这是我的Java applet代码，用于读取COM端口。

import java.util.Enumeration;
import javax.comm.CommPortIdentifier;

/** @author Venugopal */
public class COMPORT {

    /** @param args the command line arguments */
    public static void main(String[] args) {
        COMPORT CM = new COMPORT();
        String StrCommPort = CM.GetSerialPort();
        System.out.println("StrCommPort  " + StrCommPort);
    }

    public String GetSerialPort() {
        String Serialport = "";
        Enumeration portList = CommPortIdentifier.getPortIdentifiers();
        while (portList.hasMoreElements()) {
            CommPortIdentifier portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                Serialport = Serialport + portId.getName() + "//";
            } else {
                //  ////////////System.out.println(portId.getName());
            }
        }
        if(Serialport !=null && Serialport.length() >0){
            Serialport = Serialport.substring(0, Serialport.length() - 2);
        }
        return Serialport;

    }
}

Please tell us what to do.I have kept all necessary files at correct place. 请告诉我们该怎么办。我已将所有必要的文件保存在正确的位置。 The Java code I have kept here was working after that I have modified extending applet and removing PSVM with init() method. 在修改了扩展小程序并使用init()方法删除PSVM之后，我保留在此处的Java代码开始工作。

Answer 1

You need to give the applet permission, there are several ways to achieve that. 您需要授予applet权限，有几种方法可以实现。 There should be a stacktrace telling you more. 应该有一个stacktrace告诉您更多信息。

I am somewhat surprised you can sign an applet but don't understand the example, anyway in your jsp applet tag 我有点惊讶您可以签署一个applet，但无论如何在您的jsp applet标记中还是不理解该示例

<PARAM NAME="MAYSCRIPT" VALUE="true">

make a javascript function eg 做一个JavaScript函数，例如

myfunc(comport){
    //do stuff
}

in the applet something like 在小程序中像

JSObject.getWindow(this).call("myfunc",comport);

or 要么

JSObject.getWindow(this).eval("myfunc("+comport+")");

Also there is DOMService but I never used that, it is more typed but your javascript method will not be there anyway 也有DOMService，但我从未使用过，它的类型更多，但是您的javascript方法将永远不会出现

从Java小程序读取客户端COMPORT

问题描述

1 个解决方案

解决方案1
0 已采纳 2013-09-10 23:02:33

从Java小程序读取客户端COMPORT

问题描述

1 个解决方案

解决方案1 0 已采纳 2013-09-10 23:02:33

解决方案1
0 已采纳 2013-09-10 23:02:33