从Java内部运行命令行操作 [英] Running a command-line operation from within Java

问题描述

我构建了一个非常简单的程序来测试运行独立于Java的命令行操作。也就是说：以后，我希望能够修改此代码，从使用移动到我可以在命令行中输入的任何其他命令（包括调用其他非Java软件）。

我确实搜索并阅读了大概两个答案，但是它们要么暗示我尝试正确，要么对我的简单测试不感兴趣，或者提出了其他无效的解决方案（例如使用.exec（String [ ]）方法而不是.exec（String）-结果相同！）。

这是我的代码：

  import java.io.IOException; 
 
公共类RunCommand {
 
 private静态最终字符串PATH_OUT = C：\\Users\\me\\Desktop\\Temp＼ \＼out\\; 
 private static final String FILE = sample.txt; 
 private static final String PATH_IN = C：\\Users\\me\\Desktop\\Temp\\in\\; 
 
 public static void main（String [] args）{
 try {
 String command = move + PATH_IN + FILE + + PATH_OUT; 
 System.out.println（ Command： + command）; 
 Runtime.getRuntime（）。exec（command）; 
} catch（IOException e）{
 e.printStackTrace（）; 
} 
} 
} 
  

这是我看到的输出当我运行时：

 命令：move C：\Users\myingling\Desktop\CDS\Temp\ in\sample.txt C：\\ Users \\ myingling \\ Desktop\CDS\Temp\out\ 
 java.io.IOException：无法运行程序 move：CreateProcess error = 2，系统找不到在java.lang.ProcessBuilder.start（未知源）处指定的
文件在java.lang.Runtime.exec（java.lang.Runtime）处指定的文件
 exec（未知源）
在java.lang.Runtime.exec（未知源）
在RunCommand.main（RunCommand.java:13）
原因：java.io.IOException：CreateProcess错误= 2，系统无法在java.lang.ProcessImpl.create（本机方法）
找到指定的文件
。< init>（未知源）
 at java.lang.ProcessImpl.start（未知源）
 ... 5个以上
  

请注意，当我将命令复制/粘贴到命令提示符窗口中时，文件将移动

我缺少什么？我读过的所有其他问题似乎都表明这应该可行。

谢谢！

编辑，现在可以使用，谢谢大家的帮助！令人讨厌的是，它是cmd.exe参数的移动方式的隐藏方式。我希望他们做到了，如果它在复制/粘贴时起作用，在您调用.exec（）方法时起作用。哦，好吧。

解决方案

move命令是cmd.exe解释器的一部分，本身不是可执行文件。 / p>

这将起作用：

  cmd.exe / c移动file1 file2 
  

I built a very simple program to test running a command line operation separate of Java. That is: later I want to be able to modify this code from using "move" to any other command I can enter into the command line (including calling other, non-Java, software).

I did search and read probably two dozen answers, but they all either suggested I was trying this correctly, were irrelevent to my simple test or proposed other solutions which did not work (like using the .exec(String[]) method instead of .exec(String) - same result!).

Here is my code:

import java.io.IOException;

public class RunCommand {

private static final String PATH_OUT = "C:\\Users\\me\\Desktop\\Temp\\out\\";
private static final String FILE = "sample.txt";
private static final String PATH_IN = "C:\\Users\\me\\Desktop\\Temp\\in\\";

public static void main(String[] args) {
    try {
        String command = "move "+PATH_IN+FILE+" "+PATH_OUT;
        System.out.println("Command: "+command);
        Runtime.getRuntime().exec(command);
    } catch (IOException e) {
        e.printStackTrace();
    }
}
}

Here is what I see output when I run:

Command: move C:\Users\myingling\Desktop\CDS\Temp\in\sample.txt C:\Users\myingling\Desktop\CDS\Temp\out\
java.io.IOException: Cannot run program "move": CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessBuilder.start(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at RunCommand.main(RunCommand.java:13)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(Unknown Source)
at java.lang.ProcessImpl.start(Unknown Source)
... 5 more

Note that when I copy/paste the command into a command prompt window, the file moves successfully though.

What am I missing? All the other questions I've read seem to indicate this should work.

Thanks!

EDIT Works now, thanks for the help everyone! It's annoying that it's hidden the way "move" is a parameter of cmd.exe. I wish they had made it so if it worked when copy/pasted it worked when you called the .exec() method. Oh well.

解决方案

The "move" command is part of the cmd.exe interpreter, and not a executable by itself.

This would work:

cmd.exe /c move file1 file2 

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