使用外部 JARS 创建 Java 小程序 [英] Creating Java applet using external JARS
问题描述
我在 Netbeans 中创建了一个使用多个外部库的 Java Applet.当我在 Netbeans 中运行 applet.java 文件时，它工作正常，我正试图在网页中获得相同的结果.
I've created a Java Applet in Netbeans that uses several external libraries. When I run the applet.java file within Netbeans it works fine and I'm trying to get the same result in a web page.
当我在构建文件夹中运行自动创建的 applet.html 文件时，它不会加载外部库，即使我已经在 APPLET 归档标签中指定了它们并将它们移动到同一文件夹中.
When I run the automatically created applet.html-file in the build-folder it doesn't load the external library, even though I have specified them in APPLET archive-tag and moved them to the same folder.
这是我的 html 文件:
Here is my html-file:
<HTML>
<HEAD>
<TITLE>Applet HTML Page</TITLE>
</HEAD>
<BODY>
<H3><HR WIDTH="100%">Applet HTML Page<HR WIDTH="100%"></H3>
<P>
<APPLET codebase="classes" code="applet/MyApplet.class" width=350 height=200 archive="jcommon-1.0.17.jar, jfreechart-1.0.14.jar, sqljdbc4.jar"></APPLET>
</P>
<HR WIDTH="100%"><FONT SIZE=-1><I>Generated by NetBeans IDE</I></FONT>
</BODY>
</HTML>
库是 3rd-party java(jfreeChart 和 SQL-JDBC-driver)
The libraries are 3rd-party java (jfreeChart and SQL-JDBC-driver)
推荐答案
使用外部 JARS 创建 Java 小程序
Creating Java applet using external JARS
向 applet 元素的 archive 属性添加对它们的引用.
Add a reference to them to the archive attribute of the applet element.
<APPLET codebase="classes" code="applet/MyApplet.class" width=350 height=200 archive="jcommon-1.0.17.jar, jfreechart-1.0.14.jar, sqljdbc4.jar"></APPLET>
重新格式化提供:
<APPLET
codebase="classes"
code="applet/MyApplet.class"
width=350
height=200
archive="jcommon-1.0.17.jar, jfreechart-1.0.14.jar, sqljdbc4.jar">
</APPLET>
1.
code="applet/MyApplet.class"
应该是类的全限定名.如果类名是 MyApplet 并且包是 applet，则转换为:
Should be the fully qualified name of the class. If the class name is MyApplet and the package is applet, that translates to:
code="applet.MyApplet"
2.
archive="jcommon-1.0.17.jar, jfreechart-1.0.14.jar, sqljdbc4.jar">
检查一下，jcommon-1.0.17.jar中是applet.MyApplet吗?
Just checking, is applet.MyApplet in jcommon-1.0.17.jar?
codebase="classes"
这听起来不祥.这是一个带有 JSP/servlets 的成熟的 web 应用程序吗?如果是这样，我怀疑路径是错误的，因为它指向服务器上客户端(浏览器或)小程序无法到达的位置.尝试在每个小程序 Jar 上直接获取(在浏览器地址栏中粘贴预期地址，然后按回车")，如果 MyApplet.class 不在 Jar 中，请单独执行检查松散的类文件.
That sounds ominous. Is this a full-blown web-app with JSP/servlets? If so, I suspect that path is wrong, in that it is pointing to a place on the server that a client (browser or) applet cannot reach. Try doing a direct fetch (paste the expected address in the browser address bar, and hit 'enter') on each of the applet Jars, if the MyApplet.class is not in a Jar, do a separate check on the loose class file.
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