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我无法运行这个简单的嵌入式小程序。

很清楚，java.lang.ClassNotFoundException:但我认为一切都还可以。

小程序代码

package org.test;

import java.applet.*;
import java.awt.*;

    public class Main extends Applet
    {
        public void init()
        {}

        public void stop()
        {}

        public void paint(Graphics g)
        {
            g.drawString("Salam Applet",20,20);
        }
    }

UI代码（jsp页面）

<html>
<head>
    <title>salam applet</title>
</head>
<body>
<applet code="org.test.Main" width="200" height="500"></applet>
</body>
</html>

我在运行时的错误是

Java Plug-in 1.6.0_23
Using JRE version 1.6.0_23-b05 Java HotSpot(TM) Client VM
User home directory = C:\Users\hardcode
----------------------------------------------------
c:   clear console window
f:   finalize objects on finalization queue
g:   garbage collect
h:   display this help message
l:   dump classloader list
m:   print memory usage
o:   trigger logging
q:   hide console
r:   reload policy configuration
s:   dump system and deployment properties
t:   dump thread list
v:   dump thread stack
x:   clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------
load: class org.test.Main not found.
java.lang.ClassNotFoundException: org.test.Main
    at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://localhost:8080/org/test/Main.class
    at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
    at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
    at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    ... 9 more
Exception: java.lang.ClassNotFoundException: org.test.Main

这是浏览器中的错误图片。 在此处输入图像描述

4

1 回答 1

2

让我们假设以下 HTML 位于applet.htmllocalhost 的根目录中。 http://localhost:8080/applet.html.

<html>
<head>
    <title>salam applet</title>
</head>
<body>
<applet code="org.test.Main" width="200" height="500"></applet>
</body>
</html>

未指定时，代码库指向文档库http://localhost:8080/。

由于archive声明了 no，JVM 将期望在以下位置找到类文件：

http://localhost:8080/org/test/Main.class

这种路径的“酸性测试”是将其复制/粘贴到浏览器地址栏中并点击Enter

您也可以尝试使用Appleteer打开它，它会进行更多检查并产生更详细的输出。

于 2013-06-07T19:47:50.557 回答