时间戳

首页 > 解决方案 > SpringBoot Jar 无法加载 TrueType 字体

java - SpringBoot Jar 无法加载 TrueType 字体

问题描述

当我想使用包含在 springboot fat jar 中的字体时，我发现了一个奇怪的行为。在从目录加载字体的本地机器上运行测试时/resources，它运行良好。但是如果我用 maven 构建一个应用程序并从终端运行它，那么我将收到：

java.io.IOException: Problem reading font data.
at java.awt.Font.createFont0(Font.java:1000)
at java.awt.Font.createFont(Font.java:877)

我试图找到一个解决方案并做了以下事情：

方法：

     public Font getFont() throws IOException, FontFormatException {
        File f = File.createTempFile("dang", "tmp");
        assert f != null;
        f.delete();
        ClassLoader classLoader = getClass().getClassLoader();
        Font font = Font.createFont(Font.TRUETYPE_FONT, classLoader.getSystemResourceAsStream("EuroPlate.ttf"));
        font.deriveFont(105f);
        System.out.println(font.getFontName());
        return font;
    }

编辑：IDE 运行应用程序-> 工作

终端运行应用程序 -> 失败

堆栈跟踪：

java.io.IOException: Problem reading font data.
    at java.desktop/java.awt.Font.createFont0(Font.java:1183)
    at java.desktop/java.awt.Font.createFont(Font.java:1052)
    at components.NumberPlateUtility.getFont(NumberPlateUtility.java:81)
    at components.NumberPlateUtility.completeImage(NumberPlateUtility.java:173)
    at main.NumberplateClientCommands.one(NumberplateClientCommands.java:63)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.springframework.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:223)
    at org.springframework.shell.Shell.evaluate(Shell.java:169)
    at org.springframework.shell.Shell.run(Shell.java:134)
    at org.springframework.shell.jline.InteractiveShellApplicationRunner.run(InteractiveShellApplicationRunner.java:84)
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:783)
    at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:773)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1242)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1230)
    at main.Main.main(Main.java:20)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
    at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
    at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)
    at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51)

存储库：https ://github.com/Semo/numberplate_generator.git

标签： javaspring-bootfonts

解决方案

此代码将起作用：

public Font getFont() throws IOException, FontFormatException {
        File f = File.createTempFile("dang", "tmp");
        assert f != null;
        f.delete();
        ClassLoader classLoader = getClass().getClassLoader();
        Font font = Font.createFont(Font.TRUETYPE_FONT, classLoader.getResourceAsStream("EuroPlate.ttf"));
        font.deriveFont(105f);
        System.out.println(font.getFontName());
        return font;
    }

注意 中的变化classLoader.getResourceAsStream。检查这个答案以获得更多解释。

推荐阅读