带有用于串行通信的 rxtx 组件的 Java 小程序 [英] Java applet with rxtx components for serial communication

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本文介绍了带有用于串行通信的 rxtx 组件的 Java 小程序的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我正在尝试构建一个可以打开串行端口并与之通信的小程序.我使用 rxtxcomm.jar 进行串行通信.我有一个小程序,可以完美地在日食环境中运行.我构建了 Jar 文件并对其进行了签名,但是在浏览器中运行时,控制台显示以下内容:

I am trying to build an applet that can open a serial port and communicate with the same. I have used rxtxcomm.jar for the serial communications. I have an applet built that works in the eclipese environment perfectly. I built the Jar file and signed the same, but when run in the browser the console shows the foll:

java.lang.ExceptionInInitializerError thrown while loading gnu.io.RXTXCommDriver
Exception in thread "thread applet-zhas_xbeeComm.xtalk-1" java.lang.ExceptionInInitializerError
    at zhas_xbeeComm.Xconnect$1.run(Xconnect.java:46)
    at java.security.AccessController.doPrivileged(Native Method)
    at zhas_xbeeComm.Xconnect.connect(Xconnect.java:40)
    at zhas_xbeeComm.xtalk.init(xtalk.java:22)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission loadLibrary.rxtxSerial)
    at java.security.AccessControlContext.checkPermission(Unknown Source)
    at java.security.AccessController.checkPermission(Unknown Source)
    at java.lang.SecurityManager.checkPermission(Unknown Source)
    at java.lang.SecurityManager.checkLink(Unknown Source)
    at java.lang.Runtime.loadLibrary0(Unknown Source)
    at java.lang.System.loadLibrary(Unknown Source)
    at gnu.io.CommPortIdentifier.<clinit>(CommPortIdentifier.java:123)
    ... 6 more

我什至在连接和打开函数周围使用了 doPrivileged 方法,但它不起作用!请帮忙!!这是小程序的代码片段:{/** 打开端口并开始读写的函数 */

I have even used doPrivileged method around the connect and open functions but it aint working! Please help!! Here is a snippet of the code of the applet: { /** Function to open a port and begin reading and writing */

public void connect ( final String portName ) throws Exception
{   

    AccessController.doPrivileged(new PrivilegedAction() {
    public Object run() {
        // privileged code goes here, for example:

        // 1. added try catch for no such port exception;
        try {
            portIdentifier = CommPortIdentifier.getPortIdentifier(portName); //line 46
            } catch (NoSuchPortException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            }

}

推荐答案

刚遇到同样的问题.请确保第一次调用 RXTX 库是在 doPrivileged 块中.如果它将尝试在特权块之前加载库 - 它将因此错误而失败.

Just had the same problem. Please make sure that the first call to RXTX library is in doPrivileged block. If it will try to load library before privileged block - it will fail with this error.

一些附加信息:http://hacky.typepad.com/blog/2009/05/using-rxtxcomm-in-applet.html

这篇关于带有用于串行通信的 rxtx 组件的 Java 小程序的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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