public static void execCommand() {
    try {
        Runtime runtime = Runtime.getRuntime();
        // 打開(kāi)任務(wù)管理器，exec方法調(diào)用后返回 Process 進(jìn)程對(duì)象
        Process process = runtime.exec("cmd.exe /c taskmgr");
        // 等待進(jìn)程對(duì)象執(zhí)行完成，并返回“退出值”，0 為正常，其他為異常
        int exitValue = process.waitFor();
        System.out.println("exitValue: " + exitValue);
        // 銷(xiāo)毀process對(duì)象
        process.destroy();
    } catch (IOException | InterruptedException e) {
        e.printStackTrace();
    }
}

public static void execCommandAndGetOutput() {
    try {
        Runtime runtime = Runtime.getRuntime();
        Process process = runtime.exec("cmd.exe /c ipconfig");
        // 輸出結(jié)果，必須寫(xiě)在 waitFor 之前
        String outStr = getStreamStr(process.getInputStream());
        // 錯(cuò)誤結(jié)果，必須寫(xiě)在 waitFor 之前
        String errStr = getStreamStr(process.getErrorStream());
        int exitValue = process.waitFor(); // 退出值 0 為正常，其他為異常
        System.out.println("exitValue: " + exitValue);
        System.out.println("outStr: " + outStr);
        System.out.println("errStr: " + errStr);
        process.destroy();
    } catch (IOException | InterruptedException e) {
        e.printStackTrace();
    }
}

public static String getStreamStr(InputStream is) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(is, "GBK"));
    StringBuilder sb = new StringBuilder();
    String line;
    while ((line = br.readLine()) != null) {
        sb.append(line);
        sb.append("\n");
    }
    br.close();
    return sb.toString();
}

public static void main(String[] args) {
 /*獲取cmd命令*/
 try {
    Process pro = Runtime.getRuntime().exec("cmd /c calc"); //添加要進(jìn)行的命令，"cmd  /c calc"中calc代表要執(zhí)行打開(kāi)計(jì)算器，如何設(shè)置關(guān)機(jī)請(qǐng)自己查找cmd命令
    BufferedReader br = new BufferedReader(new InputStreamReader(pro
      .getInputStream())); //雖然cmd命令可以直接輸出，但是通過(guò)IO流技術(shù)可以保證對(duì)數(shù)據(jù)進(jìn)行一個(gè)緩沖。
    String msg = null;
    while ((msg = br.readLine()) != null) {
     System.out.println(msg);
    }
   } catch (IOException exception) {
   } 
 /*cmd /c dir 是執(zhí)行完dir命令后關(guān)閉命令窗口
 cmd /k dir 是執(zhí)行完dir命令后不關(guān)閉命令窗口
 cmd /c start dir  會(huì)打開(kāi)一個(gè)新窗口后執(zhí)行dir命令，原窗口會(huì)關(guān)閉
 cmd /k start dir  會(huì)打開(kāi)一個(gè)新窗口后執(zhí)行dir命令，原窗口不會(huì)關(guān)閉
 cmd /?  查看幫助信息*/
 }