Java - Exec控制台

问题描述

我遇到的问题是当我使用 cd 命令，路径被复位。例如，如果我做 cd bin ，然后 cd ../，我将从目录执行第一个

如果我想要访问一个特定的文件夹并执行一个程序，我必须这样做： / p>

cd C：\mydir& cd bin& start.exe

我想要做的是在不同的部分拆分此cmd：

cd C：\ mydir 然后 cd bin / code>

我该如何做？是否有一种方法来存储当前的 cd 路径并使用它？

---

这里是我使用的代码：

  String [] cmd_exec = new String [] {cmd / c，cmd}; 
 
 Process child = Runtime.getRuntime（）。exec（cmd_exec）; 
 
 BufferedReader in = new BufferedReader（new InputStreamReader（child.getInputStream（）））; 
 StringBuffer buffer = new StringBuffer（）; 
 buffer.append（>+ cmd +\\\
）; 
 
字符串; 
 while（（line = in.readLine（））！= null）
 {
 buffer.append（line +\\\
）; 
} 
 in.close（）; 
 child.destroy（）; 
 return buffer.toString（）; 
  

它执行命令，然后返回控制台的内容。

解决方案

感谢，我能够做到：

这里是我使用的代码：

  if（cmd.indexOf（cd）> = 0）
 {
 String req_cmd = cmd.substring（0， 3）; 
 String req_path = cmd.substring（3）; 
 if（req_path.startsWith（File.separator）|| req_path.substring（1，2）.equals（：））
 path = req_path; 
 else 
 if（new File（path + cmd.substring（3））。exists（））
 path + = cmd.substring（3）; 
 else return[错误]目录不存在。 
 
 if（！path.endsWith（File.separator））path + = File.separator; 
 
 cmd = req_cmd + path; 
} 
 else cmd =cd+ path +&+ cmd;然后你可以执行命令：
 
  

Runtime.getRuntime（）。exec（new String [] {cmd，/ c，cmd}）;


不要忘记在类中添加此属性：

  private static String path = System.getProperty（user.dir）+ File.separator; 
  

I want to create a full cross-plateform console in Java.

The problem I have is when I use the cd command, the path is reset. For example, if I do cd bin, then cd ../, I will execute the first one from the directory of my app and the second one exactly from the same directory.

If I want to go to a specific folder and execute a program I have to do something like that:

cd C:\mydir & cd bin & start.exe

What I want to do is to split this cmd in different parts:

cd C:\mydir then cd bin then start.exe

How can I do that? Is there a way to store the current cd path and use it then?

---

Here is the code I use:

String[] cmd_exec = new String[] {"cmd", "/c", cmd};

Process child = Runtime.getRuntime().exec(cmd_exec);

BufferedReader in = new BufferedReader(new InputStreamReader(child.getInputStream()));
StringBuffer buffer = new StringBuffer();
buffer.append("> " + cmd + "\n");

String line;
while ((line = in.readLine()) != null)
{
    buffer.append(line + "\n");
}
in.close();
child.destroy();
return buffer.toString();

It executes the command, then return the content of the console. (This is for windows for the moment).

解决方案

Thanks to Mads, I was able to do the trick:

Here is the code I used:

if (cmd.indexOf("cd ") >= 0)
{
    String req_cmd = cmd.substring(0, 3);
    String req_path = cmd.substring(3);
    if (req_path.startsWith(File.separator) || req_path.substring(1, 2).equals(":"))
        path = req_path;
    else
        if (new File(path + cmd.substring(3)).exists())
            path += cmd.substring(3);
        else return "[Error] Directory doesn't exist.\n";

    if (!path.endsWith(File.separator)) path += File.separator;

    cmd = req_cmd + path;
}
else cmd = "cd " + path + " & " + cmd;

Then you can execute the command calling:

Runtime.getRuntime().exec(new String[] {"cmd", "/c", cmd});

Don't forget to add this attribute in your class:

private static String path = System.getProperty("user.dir") + File.separator;

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