如何在另一个目录中包含来自网页的小程序？

Question

I'm trying to use the jZebra printing applet and am not sure how to use it from pages in different directories. The sample page has the following code:

<applet 
    id="qz"
    name="QZ Print Plugin"
    code="qz.PrintApplet.class"
    width="55"
    height="55">
    <param name="jnlp_href" value="qz-print_jnlp.jnlp">
    <param name="cache_option" value="plugin">
    <param name="disable_logging" value="false">
</applet>

If the applet (qz-print.jar) and another file (qz-print_jnlp.jnlp) are in the same directory as the page with that code, then it works fine. However, I don't know what to change to get it to work if the web page is in a different directory. It seems like this is a trivial question, but I've been searching and haven't been able to find the answer.

How should I modify the above code to get the applet in the web page when it's in a different directory?

Answer 1

The tag you are using:

<param name="jnlp_href" value="qz-print_jnlp.jnlp">

Is the equivalent of this: (notice the "./"):

<param name="jnlp_href" value="./qz-print_jnlp.jnlp">

Java uses absolute or relative paths, just as an image tag would <img src="./foo.png />

So, if you've placed your applet in one folder called "dist" (ie http://mysite/dist/qz-print.jar ) but your page was located in another folder called "web"(ie http://mysite/web/mypage.html ) then you would have to change your relative applet tag to this:

<param name="jnlp_href" value="../dist/qz-print_jnlp.jnlp">

Or optimally, change the tag to be absolute path to the jnlp:

<param name="jnlp_href" value="/dist/qz-print_jnlp.jnlp">

Additionally, as qz finds better ways to load these tags, we put them in the sample.html. I would recommend you use the latest version from here .

At the time of writing this, the best way to use the tags is this way: <applet id="qz" archive="./qz-print.jar" name="QZ Print Plugin" code="qz.PrintApplet.class" width="55" height="55"> <param name="jnlp_href" value="qz-print_jnlp.jnlp"> <param name="cache_option" value="plugin"> <param name="disable_logging" value="false"> <param name="initial_focus" value="false"> <param name="separate_jvm" value="true"> </applet><br />

Note that the archive tag should be updated as well as the jnlp tag.

The three changes from the sample you are using to the sample I've provided above are:

1. Initial focus stealing prevention for jQuery focus() events
2. The archive= tag for compatibility with certain versions of Safari.
3. The separate_jvm tag is used to load a new instance of the Java Framework on page load, which seems to resolve some sporadic loading issues with Java 8.

Finally, if you have clients that still run Java 6, I would advise you use deployQZ(); from sample.html instead, which does Java client version detection using Oracle's deployJava.js script.

-Tres