问题描述
考虑以下代码:
String commandf = "ls /etc | grep release";
try {
// Execute the command and wait for it to complete
Process child = Runtime.getRuntime().exec(commandf);
child.waitFor();
// Print the first 16 bytes of its output
InputStream i = child.getInputStream();
byte[] b = new byte[16];
i.read(b, 0, b.length);
System.out.println(new String(b));
} catch (IOException e) {
e.printStackTrace();
System.exit(-1);
}
程序的输出是:
/etc:
adduser.co
当然,当我从 shell 运行时,它按预期工作:
When I run from the shell, of course, it works as expected:
poundifdef@parker:~/rabbit_test$ ls /etc | grep release
lsb-release
互联网告诉我,由于管道行为不是跨平台的,在生产 Java 的 Java 工厂工作的聪明人不能保证管道工作.
The internets tell me that, due to the fact that pipe behavior isn't cross-platform, the brilliant minds who work in the Java factory producing Java can't guarantee that pipes work.
我该怎么做?
我不会使用 Java 结构而不是 grep
和 sed
来完成所有的解析,因为如果我想更改语言,我将被迫用那种语言重写我的解析代码,这是完全不行的.
I am not going to do all of my parsing using Java constructs rather than grep
and sed
, because if I want to change the language, I'll be forced to re-write my parsing code in that language, which is totally a no-go.
如何让 Java 在调用 shell 命令时进行管道和重定向?
How can I make Java do piping and redirection when calling shell commands?
推荐答案
编写脚本,然后执行脚本而不是单独的命令.
Write a script, and execute the script instead of separate commands.
Pipe 是 shell 的一部分,因此您也可以执行以下操作:
Pipe is a part of the shell, so you can also do something like this:
String[] cmd = {
"/bin/sh",
"-c",
"ls /etc | grep release"
};
Process p = Runtime.getRuntime().exec(cmd);
这篇关于如何使管道与 Runtime.exec() 一起工作?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!