Question

我在mac中使用以下命令并且它不起作用，对此有何想法？

String[] cmdline = { "echo", "symc", "|", "sudo", "-S", "rm", "-f", "/Applications/Test application.app" };
Runtime.getRuntime().exec(cmdline);

我也试过但是徒劳无功：

Process p = Runtime.getRuntime().exec("echo symc | sudo -S rm -rf /Applications/Test application.app");

有什么建议吗？

Answer 1

传递给exec的内容不是在shell中工作的任意命令行，而是与其参数一起启动的进程的名称。因此，如果您想要管道，甚至只需要echo命令（这不是常规可执行文件），您必须显式启动新shell，并通过命令行执行。像

这样的东西

sh -c echo ...

所以这应该有效：

String[] cmdline = { "sh", "-c", "echo symc | sudo -S rm -rf /Applications/Test application.app" };
Runtime.getRuntime().exec(cmdline);

请注意，如果要使用管道，则应仅为-c提供一个参数。

Answer 2

这对Ubuntu Linux来说非常完美！这也适用于mac（我不测试）

package me.barwnikk.library.linuxcommandroot;

import java.awt.BorderLayout;
import java.io.IOException;
import java.io.InputStream;

import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;

public class LinuxCommand {
    static InputStream is;
    static byte[] buff = new byte[8192];
    static int n;
    public static String getPasswdForRoot() throws IOException {
        Process p = Runtime.getRuntime().exec(new String[]{"sh","-c","sudo -S id"});
        is = p.getErrorStream();
        n = is.read(buff, 0, 8192);
        String text = new String(buff,0,n);
        if(text.contains("root"))return null; //not set password
        JPanel panel = new JPanel(new BorderLayout());
        JLabel lab = new JLabel(text);
        panel.add(lab,BorderLayout.NORTH);
        JPasswordField password = new JPasswordField();
        panel.add(password,BorderLayout.SOUTH);
        JOptionPane.showMessageDialog(null, panel);
        byte[] passwd = (new String(password.getPassword())+"\r\n").getBytes();
        p.getOutputStream().write(passwd);
        p.getOutputStream().flush();
        n = is.read(buff, 0, 8192);
        if(n==-1) return new String(password.getPassword());
        text = new String(buff,0,n);
        while(true) {
            lab.setText(text);
            JOptionPane.showMessageDialog(null, panel);
            p = Runtime.getRuntime().exec(new String[]{"sh","-c","sudo -S id"});
            is = p.getErrorStream();
            n = is.read(buff, 0, 8192);
            passwd = (new String(password.getPassword())+"\n").getBytes();
            p.getOutputStream().write(passwd);
            p.getOutputStream().flush();
            n = is.read(buff, 0, 8192);
            if(n==-1) return new String(password.getPassword());
            text = new String(buff,0,n);
        }
    }
    public static Process runFromRoot(String command, String password) throws IOException {
        byte[] passwd = (password+"\n").getBytes(); //for OutputStream better is byte[]
        Process p = Runtime.getRuntime().exec(new String[]{"sh","-c","sudo -S "+command});
        p.getOutputStream().write(passwd);
        p.getOutputStream().flush();
        return p;
    }
}

获取root密码是一个迷你API（用户必须写正确）。用法示例：

public static void main(String[] args) throws IOException, InterruptedException {
    String password = LinuxCommand.getPasswdForRoot();
    System.out.println("stdout of 'id':");
    Process p = LinuxCommand.runFromRoot("id",password);
    System.out.print(streamToString(p.getInputStream()));
    System.out.println("stdout of 'fdisk -l':");
    p = LinuxCommand.runFromRoot("fdisk -l",password);
    System.out.print(streamToString(p.getInputStream()));
}

方法streamToString：

public static String streamToString(InputStream stream) {
    String read = "";
    try {
        while((n=stream.read(buff, 0, 8192))!=-1) {
            read+=new String(buff,0,n);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    return read;
}

我的测试中的样品返回（抛光）：

stdout of 'id':
uid=0(root) gid=0(root) grupy=0(root)
stdout of 'fdisk -l':

Disk /dev/sda: 640.1 GB, 640135028736 bytes
głowic: 255, sektorów/ścieżkę: 63, cylindrów: 77825, w sumie sektorów: 1250263728
Jednostka = sektorów, czyli 1 * 512 = 512 bajtów
Rozmiar sektora (logiczny/fizyczny) w bajtach: 512 / 4096
Rozmiar we/wy (minimalny/optymalny) w bajtach: 4096 / 4096
Identyfikator dysku: 0xc56b9eef

Urządzenie Rozruch   Początek      Koniec   Bloków   ID  System
/dev/sda1            2048    37064703    18531328   27  Hidden NTFS WinRE
/dev/sda2   *    37064704    37269503      102400    7  HPFS/NTFS/exFAT
/dev/sda3        37269504   456711884   209721190+   7  HPFS/NTFS/exFAT
/dev/sda4       456711946  1250258624   396773339+   f  W95 Rozsz. (LBA)
Partycja 4 nie zaczyna się na granicy bloku fizycznego.
/dev/sda5       456711948   810350729   176819391    7  HPFS/NTFS/exFAT
Partycja 5 nie zaczyna się na granicy bloku fizycznego.
/dev/sda6       810350793   862802954    26226081    7  HPFS/NTFS/exFAT
Partycja 6 nie zaczyna się na granicy bloku fizycznego.
/dev/sda7       862803018  1020078408    78637695+  83  Linux
Partycja 7 nie zaczyna się na granicy bloku fizycznego.
/dev/sda8      1020079368  1229791814   104856223+   7  HPFS/NTFS/exFAT
/dev/sda9      1229791878  1250258624    10233373+   7  HPFS/NTFS/exFAT
Partycja 9 nie zaczyna się na granicy bloku fizycznego.

使用Runtime.getRuntime（）。exec时出现问题

2 个答案: