关于java调用linux shell 的问题

问题的提出：

1. shell脚本要做离线的数据处理任务
2. java调用脚本，将这种处理任务封装成webservice

特点：

1. shell处理单个时间长
2. 每次要处理文件量大

这里目前只做调用分析：

原来的：

private  void  runShell(String cmd){
                try{

                logger.info("the command "+cmd);
                // create a process for the shell
                ProcessBuilder pb = new ProcessBuilder("bash", "-c", cmd);
                pb.redirectErrorStream(true); // use this to capture messages sent to stderr
                Process shell = pb.start();
                InputStream shellIn = shell.getInputStream(); // this captures the output from the command
                int shellExitStatus = 0;
                try {
                     shellExitStatus = shell.waitFor();
                } catch (InterruptedException e) {
                        e.printStackTrace();
                } // wait for the shell to finish and get the return code
                
//                // at this point you can process the output issued by the command
//                // for instance, this reads the output and writes it to System.out:
                int c;
                while ((c = shellIn.read()) != -1) {
                        logger.info("shell read value:"+c);
                       }
                // close the stream
                        shellIn.close();
                        logger.info(" *** End *** "+shellExitStatus);
                
                logger.info("pb command "+pb.command());
                logger.info("pb command  dir  "+pb.directory());
                logger.info(pb.environment());
                logger.info(System.getenv());
                logger.info(System.getProperties());
                }
                catch (IOException ignoreMe)
                {
                        ignoreMe.printStackTrace();
                }
        }

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