在没有命令窗口的 Windows 上启动 Scala Swing 应用程序
我有一个用 Scala 编写的 Swing 应用程序，位于 .jar 文件中。我使用命令 scala "filepath\filename.jar" 创建了一个桌面快捷方式，它可以工作，只是它首先会弹出一个命令窗口，该窗口位于后台，直到我关闭应用程序。我想让这件事消失。
我相信对于 Java，您应该使用 javaw 而不是 java 来达到此目的。我尝试将 scala.bat 文件复制到名为 scalaw.bat 的新文件中，并将第 24 行更改为，
if exist "%JAVA_HOME%\bin\javaw.exe" set "_JAVACMD=%JAVA_HOME%\bin\javaw.exe"
将第 28 行更改为，
if "%_JAVACMD%"=="" set _JAVACMD=javaw
但是（更新桌面快捷方式后）我'我仍然出现命令窗口。有什么想法吗？
更新：我尝试将 scala-library.jar 添加到清单中，但它不起作用，我猜是因为路径是相对于 jar 的根目录的。其他选项似乎是在 jar 文件中包含整个 scala-library jar （从 Scala 文件创建 jar 文件），但我不认为这是一个解决方案。
或者，我可以将 jar 解压到其组成的 .class 文件，并使用快捷方式
javaw.exe -cp "%SCALA_HOME%/lib/scala-library.jar";"filepath\\" packageName.className
但是...这涉及到解压 jar。
我发现的另一个半解决方法是编辑快捷方式，以便命令窗口最小化运行。
解决方案：根据 eugener 的回答，您需要使用 javaw 不带 -jar 选项，但指定 jar 文件，例如
javaw -cp "%SCALA_HOME%/lib/*";"C:/path/yourjar.jar" packageName.className
如果它是 Swing应用程序，并且您使用 scala-swing 库，您还需要包含该库，或者使用上面的 * 通配符。
I have a Swing app written in Scala in a .jar file. I made a desktop shortcut with the command scala "filepath\filename.jar" which works, except it brings up a command window first which sits in the background until I close the application. I want to make this go away.
I believe for Java you're supposed to use javaw instead of java for this purpose. I tried copying the scala.bat file to a new file called scalaw.bat to and changing line 24 to
if exist "%JAVA_HOME%\bin\javaw.exe" set "_JAVACMD=%JAVA_HOME%\bin\javaw.exe"
and line 28 to
if "%_JAVACMD%"=="" set _JAVACMD=javaw
but (after updating the desktop shortcut) I'm still getting the command window coming up. Any ideas?
Update: I tried adding scala-library.jar to the manifest but it doesn't work, I guess because paths are relative to the jar's root. Other option seems to be include the whole scala-library jar within the jar file (Creating a jar file from a Scala file), but I don't consider that a solution.
Or I can unpack the jar to its constituent .class files and use the shortcut
javaw.exe -cp "%SCALA_HOME%/lib/scala-library.jar";"filepath\\" packageName.className
but ... that involves unpacking the jar.
Another semi-workaround Ive found is to edit the shortcut so that it the command window runs minimized.
Solution: as per eugener's answer, you need to use javaw without the -jar option, but specifying the jar-file e.g.
javaw -cp "%SCALA_HOME%/lib/*";"C:/path/yourjar.jar" packageName.className
If it's a Swing app and you use the scala-swing library you'll need to include that as well, or use the * wildcard as above.
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（3）
我建议直接使用 javaw 启动您的应用程序。由于 Scala 编译成与 Java 相同的字节码 - 你可以做到。不要忘记将标准 scala 库添加到类路径中
I would advise to launch your app directly using javaw. Since Scala compiles into the same byte code as Java - you can do it. Don't forget to add standard scala libraries to the class path
java中明确说明了这一点命令解释，关于-jar：制作快捷方式
javaw.exe -cp "%SCALA_HOME%\lib\scala-library.jar";"%SCALA_HOME%\lib\scala-swing.jar";"C:/path/yourjar.jar" packageName.mainClassName
做了工作。
因此，解决方案是包含库+带有
-cp参数的打包目标代码，并且不使用-jar开关。也作为问题中的解决方案给出。It's clearly stated in the
javacommand explanation, about-jar:Making a shortcut with
javaw.exe -cp "%SCALA_HOME%\lib\scala-library.jar";"%SCALA_HOME%\lib\scala-swing.jar";"C:/path/yourjar.jar" packageName.mainClassName
did work.
The solution is hence include libraries + packaged target code with
-cpargument and don't use the-jarswitch. As also given as a solution in the question.您可以尝试将
bat文件编译为exe（我使用快速批处理文件编译器）。我相信这会阻止命令窗口的出现。我已经很长时间没有使用 Windows，但我记得它有时对我有帮助。You can try to compile your
batfile toexe(I usedquick batch file compiler). I believe this prevent command window appearance. I did not use Windows for a long time, but I remember it helped me sometimes.