java调用cmd命令

Posted 2022-01-08 wang-liang-blogs

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

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

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

2.此方法可以达到大多的cmd调用的期望结果，但有些时候回出现命令卡死在p.waitFor();上，造成线程阻塞，原因：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.使用以下方法不会出现和2一样情况下得阻塞的问题，与2的区别就是获取流不同，将getErrorStream换成getInputStream就好了

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();