如何在GWT页面中显示java小程序？

发布于 2024-07-12 04:29:01 字数 2004 浏览 13 评论 0原文

我可能在这里遗漏了一些简单的东西，但我在其他地方找不到答案。我只想在我的 GWT 代码中显示一个小程序。

操作系统：Windows XP Java：JDK 1.6.0_10 其他：GWT、GWT-Ext 2.0.5

这是小程序（显然是为了测试而简化的）：

package foo.applet;

import javax.swing.JApplet;
import java.awt.Graphics;

public class HelloApplet extends JApplet 
{
    public void paint(Graphics g) 
    {
        g.drawRect(0, 0, 
                   getSize().width - 1,
                   getSize().height - 1);
        g.drawString("Hello world!", 5, 15);
    }
}

这是调用它的代码：


package foo.applet;

import com.google.gwt.user.client.ui.HTML;
import com.gwtext.client.widgets.Panel;


public class AppletPanel extends Panel 
{

public AppletPanel()
{
    HTML applet = new HTML();
    applet.setHTML("<applet name=\"HelloApplet\" code=\"HelloApplet.class\" width=\"300\" height=\"300\"" );
    this.add(applet);
}

}

当我以托管模式启动应用程序时，jvm 崩溃（向 Sun 提交了事件 1425130）。

当我尝试编译 GWT 代码以在浏览器中运行时，我得到以下信息：

        [ERROR] Errors in 'file:/C:/<blah>/applet/HelloApplet.java'
           [ERROR] Line 3: The import javax.swing cannot be resolved
           [ERROR] Line 4: The import java.awt cannot be resolved
           [ERROR] Line 6: JApplet cannot be resolved to a type
           [ERROR] Line 8: Graphics cannot be resolved to a type
           [ERROR] Line 11: The method getSize() is undefined for the type HelloApplet
           [ERROR] Line 12: The method getSize() is undefined for the type HelloApplet

显然我缺少一些小程序库，但我已经对 jdk 中的所有 jar 进行了 grep 并尝试包括所有列出 JApplet 或awt（plugin.jar、resources.jar、rt.jar、deploy.jar、javaws.jar）。

另外，我很确定一旦解决了这个问题，后面就会潜伏着另一个问题，但我会把它留到另一个问题。

谢谢！

旧应用程序不是小程序 - 它是胖客户端 Swing 应用程序。我们将其破解为小程序运行，因为我们的客户需要浏览器客户端，而这是完成此任务的最快方法。

我不知道 GWT 是否会接受 JPanel 解决方案 - 该应用程序不是以 GWT 可以解析的任何方式编写的 - 即它不使用 GWT API，而是使用 Swing API。 AFAIK，将 Swing 与 GWT 混合的唯一方法是采用小程序方式。

我错过了什么吗？

原文

I'm probably missing something simple here, but I can't find the answer elsewhere. I just want to display an applet in my GWT code.

OS: Windows XP
Java: JDK 1.6.0_10
Other: GWT, GWT-Ext 2.0.5

Here is the applet (obviously simplified for testing):

package foo.applet;

import javax.swing.JApplet;
import java.awt.Graphics;

public class HelloApplet extends JApplet 
{
    public void paint(Graphics g) 
    {
        g.drawRect(0, 0, 
                   getSize().width - 1,
                   getSize().height - 1);
        g.drawString("Hello world!", 5, 15);
    }
}

Here is the code calling it:


package foo.applet;

import com.google.gwt.user.client.ui.HTML;
import com.gwtext.client.widgets.Panel;


public class AppletPanel extends Panel 
{

public AppletPanel()
{
    HTML applet = new HTML();
    applet.setHTML("<applet name=\"HelloApplet\" code=\"HelloApplet.class\" width=\"300\" height=\"300\"" );
    this.add(applet);
}

}

When I launch the app in hosted mode, the jvm crashes (filed incident 1425130 with Sun).

When I try to compile the GWT code for running in a browser, I get this:

        [ERROR] Errors in 'file:/C:/<blah>/applet/HelloApplet.java'
           [ERROR] Line 3: The import javax.swing cannot be resolved
           [ERROR] Line 4: The import java.awt cannot be resolved
           [ERROR] Line 6: JApplet cannot be resolved to a type
           [ERROR] Line 8: Graphics cannot be resolved to a type
           [ERROR] Line 11: The method getSize() is undefined for the type HelloApplet
           [ERROR] Line 12: The method getSize() is undefined for the type HelloApplet

Obviously I'm missing some applet library, but I've grepped through all the jars in the jdk and tried including all of the ones that list JApplet or awt (plugin.jar, resources.jar, rt.jar, deploy.jar, javaws.jar).

Also, I'm pretty sure once I solve this problem there's another one lurking right after it, but I'll save that for another question.

Thanks!

The legacy app is not an applet - it is a thick-client Swing application. We've hacked it to run as an applet because our customers want a browser client and this is the fastest way to get that done.

I don't know if GWT would accept the JPanel solution - the app is not written in any way that GWT can parse - i.e. it's not using the GWT API, it's using the Swing API. AFAIK, the only way to mix Swing with GWT would be in an applet fashion.

Am I missing something?

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