调用Runtime.getRuntime（）EXEC（命令）。 与虚拟硬盘驱动器不起作用？

Question

I did below:

subst A: "C\Desktop"

Now from java code:

String command= "java -jar A:\test.jar"
Process process = Runtime.getRuntime().exec(command);

The JVM seems to be hanged here and never executing this line. When i run through "java -jar C:\\Desktop\\test.jar". It executes succefully.

Does Runtime.getRuntime doesn't resolve virtual hardrive? Thanks

Answer 1

I assume you have \\\\t and not \\t and you are reading from the error stream so you can see any errors. \\t is the tab character.

(The joys of MS-DOS using \\ as a path separator ;)

Dump out the error you are getting and you should see the problem.

Answer 2

Javadoc of java.lang.Process says

The parent process uses these streams to feed input to and get output from the subprocess. Because some native platforms only provide limited buffer size for standard input and output streams, failure to promptly write the input stream or read the output stream of the subprocess may cause the subprocess to block, and even deadlock.

meaning you are not either reading or writing the data promptly that causes buffer overflow in the associated process. This could be a possible problem. Please read the article on javaworld and consider implementing the reads and writes in separate threads promptly.