java - Java组件的HTML应该如何引用资源？ - Thinbug

Java组件的HTML应该如何引用资源？

时间：2014-11-07 06:44:21

标签： java html swing jlabel jeditorpane

在以下情况下，可能无法正确加载HTML（样式表，图像等）的资源：

Swing应用。是分布式的，或者当它被放入Jar文件中时。
HTML是在运行时生成的。

如何在HTML中可靠地访问此类资源？

1 个答案:

答案 0 :(得分：7)

通过相对引用链接资源（例如CSS或图像）的Jar文件中的HTML将正常工作。

E.G。

此示例从Jar中加载HTML（具有对图像的相对引用）。

import javax.swing.*;
import java.net.URL;

class ShowHtml {

    public static void main(String[] args) {
        final String address =
            "jar:http://pscode.org/jh/hs/object.jar!/popup_contents.html";
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                try {
                    URL url = new URL(address);
                    JEditorPane jep = new JEditorPane(url);
                    JFrame f = new JFrame("Show HTML in Jar");
                    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    f.add(new JScrollPane(jep));
                    f.pack();
                    f.setSize(400,300);
                    f.setLocationByPlatform(true);
                    f.setVisible(true);
                } catch(Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
}

截图

JEditorPane displaying Jar'd HTML

HTML

正在加载的HTML。

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<!--       
 *        Copyright (C) 1997  Sun Microsystems, Inc
 *                    All rights reserved.
 *          Notice of copyright on this source code 
 *          product does not indicate publication. 
 * 
 * RESTRICTED RIGHTS LEGEND: Use, duplication, or disclosure by 
 * the U.S. Government is subject to restrictions as set forth 
 * in subparagraph (c)(1)(ii) of the Rights in Technical Data
 * and Computer Software Clause at DFARS 252.227-7013 (Oct. 1988) 
 * and FAR 52.227-19 (c) (June 1987).
 *
 *    Sun Microsystems, Inc., 2550 Garcia Avenue,
 *    Mountain View, California 94043.
 *
-->
<HTML>
<HEAD>
<TITLE>
Editing Project Attributes
</TITLE>
</HEAD>
<BODY BGCOLOR="#ffffff">
<IMG SRC="images/popup_icon.gif" width="24" height="24"> <b>Popup Window</b>
<p>
Popup windows appear near the location from which they are
activated.  They are not contained in frames and thus
cannot be resized or moved by the user.  Popups are
dismissed by clicking anywhere in the help viewer.
<p>
Popup windows can be activated by clicking on a text object, 
graphic object, or JComponent button.  All three examples are
included in this demo.
<p>
<A HREF="popup_contents2.html">More...</A>
</body>
</html>

E.G。 2

对于动态创建的HTML，JRE将可能使用类文件的位置作为HTML的假定位置。但是为了消除所有疑问，我们可以在base中指定head元素。

import javax.swing.*;

class HtmlUsingBase {

    public static void main(String[] args) {
        final String htmlContent =
            "<html>" +
            "<head>" +
            "<base href='http://www.gravatar.com/'>" +
            "</head>" +
            "<body>" +
            "<h1>Image path from BASE</h1>" +
            "<img src='avatar/a1ab0af4997654345d7a9" +
            "49877f8037e?s=128&d=identicon&r=PG'" +
            " width='128' height='128'>" +
            "</body>" +
            "</html>";
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JLabel label = new JLabel(htmlContent);
                JOptionPane.showMessageDialog(null, label);
            }
        });
    }
}

截图

enter image description here