浅析Java.lang.ProcessBuilder类

package com.pmqin.quartz.domian;


import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;


public class ProcessBuildertest {

    public static void main(String[] args) {
        String file = "!/bin/sh\r\n" // linux 的换行是\n,注意换
                    + "a=\‘Hello world\‘\r\n" + "echo $a\r\n";
            String result = Process("sh", file,true);
    System.out.println(result);

        } catch (Exception e) {
            System.out.println("Error executing notepad.");
        }

    }


public static String Process(String cmd, String commandlist,boolean isSavefile) throws IOException, InterruptedException {
        
        File input = new File("./file.sh");
        createNewFile(input);

        PrintWriter print = new PrintWriter(input);
        print.append(commandlist);
        print.flush();
        print.close();
        
        String result = "SUCCESS";
        try {
            File output = null;
            if (isSavefile) {
                output = new File("./outfile");
                createNewFile(output);
            }
            

            ProcessBuilder pb = new ProcessBuilder(cmd);
            pb.redirectErrorStream(true);//如果将值设置为 true，标准错误将与标准输出合并,在此情况下，合并的数据可从 Process.getInputStream() 返回的流读取
            pb.redirectInput(input);
            if (isSavefile) {
                pb.redirectOutput(output); //表示把输出重定向到指定的文件里面
            }            

            Process process = pb.start();//异步的
        
            // 获取执行的结果
            if (!isSavefile) {
                InputStream in = process.getInputStream();//同步
                System.out.println("等待执行完成");
                String  streamtxt=getInputStream(in);                
                System.out.println(streamtxt);
            }
            if (process.waitFor() != 0) {
                //InputStream error = process.getErrorStream();
                result="Err";
            }
            process.destroy();

        } catch (IOException e) {
            result = "FAIL";
            e.printStackTrace();
        }

        return result;
    }


/**
     * inputStream 文件流 转成字符串
     * @param inputStream 文件流
     * @return
     * @throws IOException
     */
    public static String getInputStream(InputStream inputStream) throws IOException {

        StringBuilder stringBuilder = new StringBuilder();
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "gb2312"));
        String line = null;

        while ((line = bufferedReader.readLine()) != null) {

            stringBuilder.append(System.getProperty("line.separator"));

            stringBuilder.append(line);
        }
        return stringBuilder.toString();

    }
    
    /**
     * 判断文件是否存在，不存在就创建
     * @param file
     * @throws IOException 
     */
    public static void createNewFile(File file) throws IOException {        
        if (!file.exists()) {
                file.createNewFile();
        }
    }