Java执行shell命令，如何实时读取output？

Question

Through the following code, I can execute and get the shell command, and get the output, but only after the end of the process, can I get the standard output. How can I get the real-time output when the process is executing

         Process process = Runtime.getRuntime().exec(command);
         // close process's output stream.
         process.getOutputStream().close();

         pIn = process.getInputStream();
         InputStreamReader inputStreamReader = new InputStreamReader(pin, "UTF-8");
         bufferedReader = new BufferedReader(inputStreamReader);
         String line = null;
         while ((line = bufferedReader.readLine()) != null) {
             this.buf.append(line + "\n");
         }
        
        process.waitfor();

Answer 1

you can use process builder to read response of command executed

         ProcessBuilder pb = new ProcessBuilder();
            pb.command(cmd);
            Process proc = pb.start();
            proc.waitFor();

            InputStream inputStream = proc.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            String responseLine = "";
            StringBuilder output = new StringBuilder();
            while (( responseLine = reader.readLine())!= null) {
                output.append(responseLine + "\n");
            }