java调用cmd命令

1.使用Runtime中exec(String command)方法执行cmd命令，以下：

Process p = Runtime.getRuntime().exec(cmd);

此方法会抛出IOException，可是在项目中遇到没有出现异常，命令也没有执行的状况。

2.此方法能够达到大多的cmd调用的指望结果，但有些时候回出现命令卡死在p.waitFor();上，形成线程阻塞，缘由：https://blog.csdn.net/weixin_34408624/article/details/86015882

public static boolean runCMD(String cmd) throws IOException, InterruptedException {
        final String METHOD_NAME = "runCMD";
        Process p = Runtime.getRuntime().exec(cmd);
        BufferedReader br = null;
        try {
            br = new BufferedReader(new InputStreamReader(p.getErrorStream()));
            String readLine = br.readLine();
            StringBuilder builder = new StringBuilder();
            while (readLine != null) {
                readLine = br.readLine();
                builder.append(readLine);
            }
            logger.debug(METHOD_NAME + "#readLine: " + builder.toString());

            p.waitFor();
            int i = p.exitValue();
            logger.info(METHOD_NAME + "#exitValue = " + i);
            if (i == 0) {
                return true;
            } else {
                return false;
            }
        } catch (IOException e) {
            logger.error(METHOD_NAME + "#ErrMsg=" + e.getMessage());
            e.printStackTrace();
            throw e;
        } finally {
            if (br != null) {
                br.close();
            }
        }
    }

 

3.使用如下方法不会出现和2同样状况下得阻塞的问题，与2的区别就是获取流不一样，将getErrorStream换成getInputStream就行了

public static boolean runCMD(String cmd) throws IOException, InterruptedException {
        final String METHOD_NAME = "runCMD";
        
        // Process p = Runtime.getRuntime().exec("cmd.exe /C " + cmd);
        Process p = Runtime.getRuntime().exec(cmd);
        BufferedReader br = null;
        try {
            // br = new BufferedReader(new InputStreamReader(p.getErrorStream()));
            br = new BufferedReader(new InputStreamReader(p.getInputStream()));
            String readLine = br.readLine();
            StringBuilder builder = new StringBuilder();
            while (readLine != null) {
                readLine = br.readLine();
                builder.append(readLine);
            }
            logger.debug(METHOD_NAME + "#readLine: " + builder.toString());

            p.waitFor();
            int i = p.exitValue();
            logger.info(METHOD_NAME + "#exitValue = " + i);
            if (i == 0) {
                return true;
            } else {
                return false;
            }
        } catch (IOException e) {
            logger.error(METHOD_NAME + "#ErrMsg=" + e.getMessage());
            e.printStackTrace();
            throw e;
        } finally {
            if (br != null) {
                br.close();
            }
        }
    }