我试图写一个小的Java应用程序，将覆盖我/etc/resolv.conf文件（我是在Ubuntu 12.04）。 要做到这一点，我需要提供我的root密码：
myUser@myMachine:~$ sudo vim /etc/resolv.conf
[sudo] password for myUser: *****
所以这样做的过程有三个步骤：
- 型
sudo vim /etc/resolv.conf在终端 - 终端要求我输入
root口令 - 我输入密码，然后按
[Enter]
一切从我的研究，我可以用执行上述步骤＃1以下几点：
try {
String installTrickledCmd = "sudo vim /etc/resolv.conf";
Runtime runtime = Runtime.getRuntime();
Process proc = runtime.exec(installTrickledCmd);
}
catch(Throwable throwable) {
throw new RuntimeException(throwable);
}
但这个执行时，外壳会想提示我的Java程序的密码。 我不知道如何等待这个（上述步骤＃2），然后提供我的密码回到壳（上面的步骤＃3）。 提前致谢。
你有没有用-S试过吗？
$echo mypassword | sudo -S vim /etc/resolv.conf
从人：
The -S (stdin) option causes sudo to read the password from the standard input
instead of the terminal device. The password must be followed by a newline
character.
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
public class Test1 {
public static void main(String[] args) throws Exception {
String[] cmd = {"sudo","-S", "ls"};
System.out.println(runSudoCommand(cmd));
}
private static int runSudoCommand(String[] command) throws Exception {
Runtime runtime =Runtime.getRuntime();
Process process = runtime.exec(command);
OutputStream os = process.getOutputStream();
os.write("harekrishna\n".getBytes());
os.flush();
os.close();
process.waitFor();
String output = readFile(process.getInputStream());
if (output != null && !output.isEmpty()) {
System.out.println(output);
}
String error = readFile(process.getErrorStream());
if (error != null && !error.isEmpty()) {
System.out.println(error);
}
return process.exitValue();
}
private static String readFile(InputStream inputStream) throws Exception {
if (inputStream == null) {
return "";
}
StringBuilder sb = new StringBuilder();
BufferedReader bufferedReader = null;
try {
bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
String line = bufferedReader.readLine();
while (line != null) {
sb.append(line);
line = bufferedReader.readLine();
}
return sb.toString();
} finally {
if (bufferedReader != null) {
bufferedReader.close();
}
}
}
}
从维贾诺答案启发。
