Java Runtime.getRunTime()。exec(CMD)不支持管道

时间:2012-10-24 09:53:00

标签: java windows command cmd pipe

我正在尝试编写一个程序,该程序将显示并能够使用JFrame窗口更新您的IP地址设置。我正在寻找纯粹在Windows上运行,所以我试图能够使用netsh windows命令来检索/设置细节。

windows命令:     netsh interface ip show config name="Local Area Connection" | Find "IP" 我完全按照我想要的方式返回,但是我写的代码不会通过管道工作,只有当我写到“本地连接”部分时它才会起作用。

有没有办法使用管道功能才能专门返回IP地址?我读过你可以将这行作为字符串数组传递,即String [] cmd = netsh ........

package ipchanger;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class test {

    private String CMD;

public void executecommand(String CMD) {
        this.CMD = CMD;

        try {
            // Run whatever string we pass in as the command
            Process process = Runtime.getRuntime().exec(CMD);

            // Get input streams
            BufferedReader stdInput = new BufferedReader(new InputStreamReader(process.getInputStream()));
            BufferedReader stdError = new BufferedReader(new InputStreamReader(process.getErrorStream()));

            // Read command standard output
            String s;
            System.out.println("Standard output: ");
            while ((s = stdInput.readLine()) != null) {
                System.out.println(s);

            }

            // Read command errors
            System.out.println("Standard error: ");
            while ((s = stdError.readLine()) != null) {
                System.out.println(s);
            }
        } catch (Exception e) {
            e.printStackTrace(System.err);
        }
}


public test() {
    String FINDIP = "netsh interface ip show config name=\"Local Area Connection\" | Find \"IP\"";
    //System.out.println(FINDIP);
    executecommand(FINDIP);

}


public static void main(String[] args) {
    new test();
}
}

以为你们可以提供帮助。

1 个答案:

答案 0 :(得分:6)

幸运的是,有一种方法可以运行包含管道的命令。该命令必须以cmd /C为前缀。 e.g:

public static void main(String[] args) throws Exception {
    String command = "cmd /C netstat -ano | find \"3306\"";
    Process process = Runtime.getRuntime().exec(command);
    process.waitFor();
    if (process.exitValue() == 0) {
        Scanner sc = new Scanner(process.getInputStream(), "IBM850");
        sc.useDelimiter("\\A");
        if (sc.hasNext()) {
            System.out.print(sc.next());
        }
        sc.close();
    } else {
        Scanner sc = new Scanner(process.getErrorStream(), "IBM850");
        sc.useDelimiter("\\A");
        if (sc.hasNext()) {
            System.err.print(sc.next());
        }
        sc.close();
    }
    process.destroy();
}

备注