使用 Java 打开外部非 java 文件
我正在尝试访问文件“J:\Java\NetBeansProjects\List offorken things\list.eml”并使用操作系统定义的默认应用程序打开它。这可以通过调用在命令提示符中完成，
cd "J:\Java\NetBeansProjects\List of forgoten things"
"list.eml"
所以我决定使用
Runtime.getRuntime().exec("cd \"" + System.getProperty("user.dir") + "\"\n\r" + "\"" + selectedFile.getName() + "\"");
，但它不断给我一个 IOException：
java.io.IOException: Cannot run program "cd": CreateProcess error=2, The system cannot find the file specified
有人有任何经验或建议想要分享吗？
I am trying to access the file "J:\Java\NetBeansProjects\List of forgoten things\list.eml" and open it using the OS-defined default application. This can be acomplished in the command prompt by calling
cd "J:\Java\NetBeansProjects\List of forgoten things"
"list.eml"
so I decided to use
Runtime.getRuntime().exec("cd \"" + System.getProperty("user.dir") + "\"\n\r" + "\"" + selectedFile.getName() + "\"");
but it keeps giving me an IOException:
java.io.IOException: Cannot run program "cd": CreateProcess error=2, The system cannot find the file specified
does anyone have any experience or advice they would like to share?
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cd不是真正的可执行文件 - 它是 shell 内置命令。此外，我认为您想要做的是在 Java 6 中使用
Desktop，特别是open方法，尝试使用平台上默认注册的应用程序打开文件（如果存在）。http://download.oracle.com/javase/ 6/docs/api/java/awt/Desktop.html
cdis not a real executable - it is a shell built-in command.Additionally, I think what you want to do is use
Desktopin Java 6, specifically theopenmethod, which attempts to open a file with the default registered application on the platform (if it exists).http://download.oracle.com/javase/6/docs/api/java/awt/Desktop.html
发生这种情况是因为 exec 尝试将 cd 命令作为真实文件执行，而它只是 shell 命令 (cmd.exe)。
您可以尝试调用
cmd /C "cdwhateverdir "将命令传递给 shell exe 或使用.bat文件。This happens because exec tries to execute the
cdcommand as a real file while it's only a command of shell (cmd.exe).You could try by invoking
cmd /C "cd whateverdir "to pass the command to shell exe or using a.batfile.在执行文件之前，您不需要
CD到该目录。只需提供完整路径即可。You don't need to
CDto the directory before executing the file. Just provide the full path.