我真的不知道我错过了什么。我花了很多时间阅读如何设置类路径,但这仍然不起作用,在这一点上,我相信它一定是一些琐碎的东西,我逃脱了。
我正在尝试使用swing radiance libraries来改变swing应用程序的外观。我按照build documentation生成jar文件,当这些文件不起作用时,我下载并尝试prebuilt binaries。我向开发者提出了一个问题,并确认我遵循的getting started instructions是正确的。演示代码如下:
import java.awt.*;
import javax.swing.*;
import java.awt.image.*;
public class Walkthrough extends JFrame {
public Walkthrough() {
super("Sample app");
this.setLayout(new FlowLayout());
this.add(new JButton("button"));
this.add(new JCheckBox("check"));
this.add(new JLabel("label"));
this.setIconImage(new BufferedImage(1, 1, BufferedImage.TYPE_4BYTE_ABGR));
this.setSize(new Dimension(250, 80));
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
JFrame.setDefaultLookAndFeelDecorated(true);
SwingUtilities.invokeLater(() -> {
Walkthrough w = new Walkthrough();
w.setVisible(true);
});
}
}
代码首先用javac Walkthrough.java
编译,然后用java Walkthrough
执行。这可以很好地工作。接下来,radiance jars用于更改外观,这是通过设置swing.defaultlaf
属性来使用radiance中的皮肤来完成的。这就是它不起作用的地方。
我将所有必需的jars文件复制到一个tmp
目录中,在这个目录中,演练示例直接位于tmp
之外。然后,我尝试运行应用程序,如下所示:
java -Dswing.defaultlaf=org.pushingpixels.substance.api.skin.SubstanceBusinessLookAndFeel -cp .:tmp/radiance-substance-2.5-SNAPSHOT.jar:tmp/radiance-trident-2.5-SNAPSHOT.jar:tmp/radiance-neon-2.5-SNAPSHOT.jar Walkthrough
这会导致以下异常:
Exception in thread "AWT-EventQueue-0" java.lang.Error: Cannot load org.pushingpixels.substance.api.skin.SubstanceBusinessLookAndFeel
at java.desktop/javax.swing.UIManager.initializeDefaultLAF(UIManager.java:1406)
at java.desktop/javax.swing.UIManager.initialize(UIManager.java:1517)
at java.desktop/javax.swing.UIManager.maybeInitialize(UIManager.java:1483)
at java.desktop/javax.swing.UIManager.getUI(UIManager.java:1056)
at java.desktop/javax.swing.JPanel.updateUI(JPanel.java:126)
at java.desktop/javax.swing.JPanel.<init>(JPanel.java:86)
at java.desktop/javax.swing.JPanel.<init>(JPanel.java:109)
at java.desktop/javax.swing.JPanel.<init>(JPanel.java:117)
at java.desktop/javax.swing.JRootPane.createGlassPane(JRootPane.java:521)
at java.desktop/javax.swing.JRootPane.<init>(JRootPane.java:348)
at java.desktop/javax.swing.JFrame.createRootPane(JFrame.java:279)
at java.desktop/javax.swing.JFrame.frameInit(JFrame.java:258)
at java.desktop/javax.swing.JFrame.<init>(JFrame.java:225)
at Walkthrough.<init>(Walkthrough.java:7)
at Walkthrough.lambda$main$0(Walkthrough.java:23)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:389)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
org.pushingpixels.substance.api.skin.SubstanceBusinessLookAndFeel位于radiance-substance-2.5-SNAPSHOT.jar中。我已经确认它确实和jar tvf
在一起
jar tvf radiance-substance-2.5-SNAPSHOT.jar | grep SubstanceBusinessLookAndFeel
548 Fri Feb 01 00:00:00 GMT 1980 org/pushingpixels/substance/api/skin/SubstanceBusinessLookAndFeel.class
在这一点上,我确信我把类路径搞乱了,但是我不知道是什么搞乱了。我使用的是Fedora 28,我的java版本是:
java version "12.0.1" 2019-04-16
Java(TM) SE Runtime Environment (build 12.0.1+12)
Java HotSpot(TM) 64-Bit Server VM (build 12.0.1+12, mixed mode, sharing)
发布于 2019-06-13 07:26:03
这与类路径无关,而是与jar库本身有关。我观察到,在我的机器(Fedora 28,使用i3-gaps作为窗口管理器)上,默认情况下字体没有抗锯齿。我想知道这是否有某种关联,并阅读了一些关于Java运行时环境字体的内容。从本质上讲,字体看起来像这样:
但是使用这个系统属性启动应用程序:-Dawt.useSystemAAFontSettings=on
修复了一些问题:
事实证明,在使用Radiance启动漫游时设置此属性可以使其正常工作:
java -Dawt.useSystemAAFontSettings=on -Dswing.defaultlaf=org.pushingpixels.substance.api.skin.SubstanceBusinessLookAndFeel -cp .:tmp/radiance-substance-2.5-SNAPSHOT.jar:tmp/radiance-trident-2.5-SNAPSHOT.jar:tmp/radiance-neon-2.5-SNAPSHOT.jar Walkthrough
。
删除此属性会导致出现Java无法加载org.pushingpixels.substance.api.skin.SubstanceBusinessLookAndFeel.的错误
阅读here有更多信息。我假设是因为我自定义了我的Fedora28设置(我不使用gnome),所以我没有运行gnome-settings-daemon
来获取系统默认值,这对Radiance来说是个问题吗?不确定。
我已经通知了Radiance开发人员这件事。如果/当他提供反馈时,我会更新这个答案。
更新开发人员确认库中有一个错误。它已经修复了。
https://stackoverflow.com/questions/56545385
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