2008年4月13日星期日

vnc-java 一个 VNC 的 Java applet 客户端

见 vnc-java 包内容，
/usr/bin/jvncviewer
/usr/share/java/vncviewer-3.3.3r2.jar
/usr/share/vnc-java
/usr/share/vnc-java/animatedMemoryImageSource.class
/usr/share/vnc-java/authenticationPanel.class
/usr/share/vnc-java/clipboardFrame.class
/usr/share/vnc-java/DesCipher.class
/usr/share/vnc-java/optionsFrame.class
/usr/share/vnc-java/rfbProto.class
/usr/share/vnc-java/vncCanvas.class
/usr/share/vnc-java/vncviewer.class
/usr/share/vnc-java/hextile.vnc
/usr/share/vnc-java/index.vnc
/usr/share/vnc-java/noshared.vnc
/usr/share/vnc-java/shared.vnc
/usr/share/vnc-java/tight.vnc
/usr/share/vnc-java/zlib.vnc
/usr/share/man/man1/jvncviewer.1.gz
/usr/share/java/vncviewer.jar
/usr/share/vnc-java/vncviewer.jar
其实主要就是 /usr/share/vnc-java 这个目录了，里面的 class 文件就是 applet 需要的东西，vnc 文件是一套模板。怎么用这个东西呢？

比如我们把上面文件放在 ~/vnc-html 里面，则可以如下调用 vncserver，
$ vncserver :1 -geometry 640x480 -depth 16 -httpd ~/vnc-html -httpPort 5678
这样，将在本地 5678 端口建立一个 mini http 的服务器（Xvnc 这个进程负责），并用 vnc 文件作为模板生成页面（上面含有 java applet）。这样在浏览器上输入 http://ur-ip-or-url:5678 即可打开该页面，如果你的浏览器支持 java applet（现在使用的 jre 1.5 可以正常浏览，但是 1.6 不行），就应该看到登录界面了。

那么这是什么原理呢？是否可以用一个一般性的 http 服务器实现这个过程呢？那么我们来看看上面那些 vnc 文件都有些什么吧！
<!-- index.vnc - default html page for Java VNC viewer applet.  On any file
  ending in .vnc, the HTTP server embedded in Xvnc will substitute the
  following variables when preceded by a dollar: USER, DESKTOP, DISPLAY,
  APPLETWIDTH, APPLETHEIGHT, WIDTH, HEIGHT, PORT.  Use two dollar signs
  ($$) to get a dollar sign in the generated html. -->

<HTML>
<TITLE>
$USER's $DESKTOP desktop ($DISPLAY)
</TITLE>
<APPLET CODE=vncviewer.class ARCHIVE=vncviewer.jar
     WIDTH=$APPLETWIDTH HEIGHT=$APPLETHEIGHT>
<param name=PORT value=$PORT>
</APPLET>
<A href="http://www.tightvnc.com/">www.TightVNC.com</A>
</HTML>
注意，其中一些 $ 开始的是关于 VNC server 的一些参数，由 Xvnc 运行时替换。这样我们不难知道，实现一般 http server 的方式就是将这些对应的页面放在 http server 的合适目录下面，然后将这些 vnc 文件通过某种方式变成 html（估计写个 sed 或者直接 shell 就可以替换掉这些东西了）。

但是这个 applet 必须直接能访问到 vnc server，如果中间被防火墙隔开了，也就没有用了。
时间：

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