使用 java 运行交互式 shellscript

Question

我正在编写一个 javacode 来调用交互式 shellscript 并使用 process builder 来调用 shellscript。我知道要将参数传递给这个 shell 脚本，我必须使用它的输入流来检查它的输出，并且需要使用输出流将命令传递给它。我的问题是，我如何知道使用 Input Stream 提示输入值？

我的代码：

  ProcessBuilder pb2=new ProcessBuilder("/home/abhijeet/sample1.sh","--ip="+formobj.getUpFile().getFileName(),"--seqs="+seqs);

        script_exec = pb2.start();

                OutputStream in = script_exec.getOutputStream();

                InputStreamReader rd=new InputStreamReader(script_exec.getInputStream());   

                pb2.redirectError();

                BufferedReader reader1 =new BufferedReader(new InputStreamReader(script_exec.getInputStream()));

                StringBuffer out=new StringBuffer();

                String output_line = "";    

                  while ((output_line = reader1.readLine())!= null) 
                  {
                           out=out.append(output_line+"/n");
                           System.out.println("val of output_line"+output_line);

                           //---> i need code here to check that whether script is prompting for taking input ,so i can pass it values using output stream

                  }

有没有办法直接知道脚本正在等待用户输入？

Answer 1

读取进程输出流并检查输入提示，如果知道输入提示，则将值放入进程输入流。 否则你没办法检查。

ProcessBuilder pb = new ProcessBuilder(command);
pb.redirectErrorStream(true);
BufferedReader b1 = new BufferedReader(new InputStreamReader(p.getInputStream()));
BufferedWriter w1 = new BufferedWriter(new OutputStreamWriter(p.getOutputStream()));
String line = "";
String outp = "";
while ((line = b1.readLine()) != null) {
  if (line.equals("PLEASE INPUT THE VALUE:")) {
     // output to stream
     w1.write("42");
  }
  outp += line + "\n";
}

...

UPD：对于您的代码，它应该是这样的

    ProcessBuilder pb2=new ProcessBuilder("/home/ahijeet/sample1.sh","--ip="+formobj.getUpFile().getFileName(),"--seqs="+seqs);

    script_exec = pb2.start();

            OutputStream in = script_exec.getOutputStream();

            InputStreamReader rd=new InputStreamReader(script_exec.getInputStream());   

            pb2.redirectError();

            BufferedReader reader1 =new BufferedReader(new InputStreamReader(script_exec.getInputStream()));

            StringBuffer out=new StringBuffer();

            String output_line = "";    

              while ((output_line = reader1.readLine())!= null) 
              {
                       out=out.append(output_line+"/n");
                       System.out.println("val of output_line"+output_line);

                       //---> i need code here to check that whether script is prompting for taking input ,so i can pass it values using output stream
                       if (output_line.equals("PLEASE INPUT THE VALUE:")) {
                           // output to stream
                           in.write("42");
                       }

              }