使用Runtime.exec导致“系统无法找到指定文件”的原因是什么？ (

Runtime.getRuntime().exec("assoc .vlan="file type description"");
Runtime.getRuntime().exec("ftype "file type description"=" + System.getProperty("user.home")+ "folder 1folder 2my executable.exe" /inject "%1"");

这是例外.

java.io.IOException: Cannot run program "assoc": CreateProcess error=2,The system cannot find the file specified
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
at java.lang.Runtime.exec(Runtime.java:615)
at java.lang.Runtime.exec(Runtime.java:448)
at java.lang.Runtime.exec(Runtime.java:345)

好吧,我已经改变了这个但仍然没有建立关联,而同一个命令是可执行的并且在cmd命令提示符下工作.

Runtime.getRuntime().exec("cmd.exe /c assoc .vlan="file type description"");
Runtime.getRuntime().exec("cmd.exe /c ftype "file type description"="" + System.getProperty("user.home") + "folder 1folder 2my executable.exe" /inject "%1"");

任何补充建议？谢谢！