java - 如何从 java 更改 cmd 工作目录？

Question

我正在尝试执行不在默认工作目录中的bat 文件(来自java)。我尝试了下面的代码，但它似乎不适用于“CD”命令。

    String executeCommand(String command) {

    StringBuffer output = new StringBuffer();

    Process p;
    try {

        p = Runtime.getRuntime().exec(command);
        p.waitFor();
        BufferedReader reader =
                new BufferedReader(new InputStreamReader(p.getInputStream()));

        String line = "";
        while ((line = reader.readLine())!= null) {
            output.append(line + "\n");
        }

    } catch (Exception e) {
        e.printStackTrace();
    }

    return output.toString();

}

///////////////////////////////////////////////////////////////////////////////////////////////////////////这是应该执行命令的代码/////////////////////////////////////////////////////////////////

    String command = "cd C:\usmt" ;

    //in windows
    //String command = "ping -n 3 " + domainName;

    String output = obj.executeCommand(command);

    System.out.println(output);

Answer 1

尝试这样的事情:

public class CmdTest {
    public static void main(String[] args) throws Exception {
        ProcessBuilder builder = new ProcessBuilder(
            "cmd.exe", "/c", "cd \"C:\\Program Files\\myfile.txt");
        builder.redirectErrorStream(true);
        Process p = builder.start();
        BufferedReader r = new BufferedReader(new InputStreamReader(p.getInputStream()));
        String line;
        while (true) {
            line = r.readLine();
            if (line == null) { break; }
            System.out.println(line);
        }
    }
}

如果您尝试在没有 CD 的情况下执行此操作，请使用:

 ProcessBuilder builder = new ProcessBuilder(
            "cmd.exe", "/c", "C:\\Program Files\\myfile.txt");