我们最近将我们一位客户的 Oracle 数据库从 Windows-1252 转换为 Unicode(我不知道他们是如何忍受的;他们保存了许多个人姓名)。
一切正常,除了一些角色。正是字符 ṣ
(下面有一个点的 s)让问题进入了我们的世界。
据我所知,当未指定时,Java 使用其逻辑字体来查找适用于每个操作系统的字体(请参阅 https://docs.oracle.com/javase/tutorial/2d/text/fonts.html)。
我建立了一个简单的例子,这是来自 https://docs.oracle.com/javase/tutorial/uiswing/components/textfield.html 的例子:
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/* TextDemo.java requires no other files. */
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class Chartest extends JPanel implements ActionListener {
protected JTextField textField;
protected JTextArea textArea;
private final static String newline = "\n";
public Chartest() {
super(new GridBagLayout());
// UIManager.getLookAndFeelDefaults().put("TextField.font", new Font("Arial",
// Font.PLAIN, 14));
textField = new JTextField(20);
textField.addActionListener(this);
textArea = new JTextArea(5, 20);
textArea.setEditable(false);
JScrollPane scrollPane = new JScrollPane(textArea);
// Add Components to this panel.
GridBagConstraints c = new GridBagConstraints();
c.gridwidth = GridBagConstraints.REMAINDER;
c.fill = GridBagConstraints.HORIZONTAL;
add(textField, c);
c.fill = GridBagConstraints.BOTH;
c.weightx = 1.0;
c.weighty = 1.0;
add(scrollPane, c);
}
public void actionPerformed(ActionEvent evt) {
String text = textField.getText();
textArea.append(text + newline);
textField.selectAll();
// Make sure the new text is visible, even if there
// was a selection in the text area.
textArea.setCaretPosition(textArea.getDocument().getLength());
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event dispatch thread.
*/
private static void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("TextDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Add contents to the window.
frame.add(new Chartest());
// Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
// Schedule a job for the event dispatch thread:
// creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
我唯一添加的是以下行:
// UIManager.getLookAndFeelDefaults().put("TextField.font", new Font("Arial", Font.PLAIN, 14));
如果没有这一行,ṣ
在文本字段中输入时会变成一个正方形。如果你取消注释这一行,它就起作用了。查看Java lib文件夹下的fontconfig.properties.src
,所有逻辑字体都指向可以显示ṣ
的字体:Times, Courier, Arial。我将文件重命名为 fontconfig.properties
并将所有内容更改为 Arial
以覆盖默认值。它没有改变任何东西。
这也不起作用:
UIManager.getLookAndFeelDefaults().put("TextField.font", new Font("Dialog", Font.PLAIN, 14));
尽管 Dialog 显然在 fontconfig.properties.src
中引用了 Arial。
我忽略了什么?我正在使用 Java 10。
最佳答案
逻辑字体的渲染似乎是一个谜。在一次测试运行中,我在 JTextArea
中正确呈现了相关字符,但在 JTextField
中却没有,而 textArea.getFont()==textField.getFont ()
评估为 true
!
fontconfig.properties.src
指的是 Arial
,但它也包含这一行:
exclusion.alphabetic=0700-1e9f,1f00-2017,2020-20ab,20ad-20b8,20bb-20bc,20be-f8ff
and ṣ
and Ṣ
(U+1e63
and U+1e62
) 正好在这个范围内。
我不知道这些明显的“字母”字符在被排除在外时应该在哪里结束。 This document只是说:
This is used if a font with a large character repertoire needs to be placed early in the search sequence (for example, for performance reasons), but some characters that it supports should be drawn with a different font instead.
但我不知道为什么不应该使用配置为“字母”的第一个字体呈现这些字符,而搜索序列中的其他字体应该呈现它们。
此外,这个范围看起来很随意,即它意味着虽然 Ṣ
和 ṣ
在排除范围内,但 Ạ
和 ạ
不是并且可以正确呈现。
当你把这一行变成评论时,即
#exclusion.alphabetic=0700-1e9f,1f00-2017,2020-20ab,20ad-20b8,20bb-20bc,20be-f8ff
问题消失了。
我有一种感觉,原来的排除条款导致渲染以嵌入的 Lucida 字体结束,无法渲染这些字符。在 JDK 11 中,这个排除行仍然存在并且是更新版本:
exclusion.alphabetic=0700-1cff,1d80-1e9f,1f00-2017,2020-20ab,20ad-20b8,20bb-20bc,20be-f8ff
仍然涵盖 ṣ
和 Ṣ
(U+1e63
和 U+1e62
)。但是 Lucida 字体已被删除,因此,AWT 代码中对这些字体的硬编码引用也必须已被删除。
作为 JDK 10 和 JDK 11 之间所做更改的最终结果,字符 ṣ
和 Ṣ
可以正确呈现。
所以最重要的是,与其尝试修复 JDK 10 的 AWT 配置,您还可以简单地更新到 JDK 11。
这适用于 OpenJDK 11 和 Oracle JDK 11。它们的字体配置文件仅在许可证 header 注释上有所不同……
关于java - Java 中的某些 unicode 字符不显示在 JTextField 中,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52851735/