如何在java中使用“ls*.c”命令？-Howtouse“ls*.c”commandinjava?

1  

One example to list files since Java 7.

自Java 7以来列出文件的一个示例。

import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
public class Main {
    public static void main(String[] args) {
        Path dir = Paths.get("/your/path/");
        try {
            DirectoryStream ds = Files.newDirectoryStream(dir, "*.{c}");
            for (Path entry: ds) {
                System.out.println(entry);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

1  

You need to execute a command of the form "bash -c 'ls *.c'" ... because the java exec methods do not understand '*' expansion (globbing). (The "bash -c" form ensures that a shell is used to process the command line.)

你需要执行“bash -c'ls * .c'”形式的命令...因为java exec方法不理解'*'扩展（globbing）。 （“bash -c”形式确保使用shell来处理命令行。）

However, you can't simply provide the above command as a single String to Runtime.exec(...), because exec also doesn't understand the right way to split acommand string that has quoting in it.

但是，您不能简单地将上述命令作为单个String提供给Runtime.exec（...），因为exec也不了解拆分在其中引用的acommand字符串的正确方法。

Therefore, to get exec to do the right thing, you need to do something like this:

因此，要让exec做正确的事，你需要做这样的事情：

  String lscmd = "ls *.c";
  Process p = Runtime.getRuntime().exec(new String[]{"bash", "-c", lscmd});

In other words, you need to do the argument splitting by hand ...

换句话说，你需要手工分割参数...

It should be noted that this example could also be implemented by using FileMatcher to perform the "globbing" and assemble the argument list from the results. But is complicated if you are going something other than running ls ... and IMO the complexity is not justified.

应该注意的是，这个例子也可以通过使用FileMatcher来执行“globbing”并从结果中组装参数列表来实现。但是如果你想要运行ls以外的东西是很复杂的......而且IMO的复杂性是不合理的。

1  

The * is expanded by the shell. So to use it to expand a filename as a glob, you would have to call the ls command through a shell, e.g. like this:

*由shell扩展。因此，要使用它将文件名扩展为glob，您必须通过shell调用ls命令，例如喜欢这个：

String lscmd = " bash -c 'ls *.c' ";

Edit

编辑

Good point from @Stephen, about exec failing to split the command. To execute the ls -d1 $PWD/* you can do it like this:

来自@Stephen的好点，关于exec未能拆分命令。要执行ls -d1 $ PWD / *，你可以这样做：

String lscmd = "ls -d1 $PWD/*";
Process p = Runtime.getRuntime().exec(new String[]{"bash", "-c", lscmd});

-1  

I know, it doesn't directly answers your question, but if you can, prefer the OS independent way to list files in directory.

我知道，它并没有直接回答你的问题，但如果可以的话，更喜欢以OS独立的方式列出目录中的文件。

The advantages are - not Unix/Linux specific Doesn't require to spawn the process (its very expensive).

优点是 - 不是Unix / Linux特定的不需要产生进程（它非常昂贵）。

Here you can find an example of how to do this in java:

在这里你可以找到一个如何在java中执行此操作的示例：

List Files in Directory

列出目录中的文件

Hope this helps

希望这可以帮助