使用inputStream和OutputStream读取数据并将其写入进程 [英] Using inputStream and OutputStream to read and write data to a process

问题描述

我当前正在运行 .class 文件作为进程。 .class 文件是一个简单的程序，要求用户输入数字，接受输入并将用户的输入打印回屏幕。
到目前为止，我已经设法通过 InputStream 从控制台上的进程中打印了输入数字：语句，并写入了用户输入的输入通过 OutputStream 。我无法在屏幕上打印最后的语句，应该是

I am currently running a .class file as a process. The .class file is a simple program that asks the user to input a number, takes the input and prints the user's input back to the screen. Up to now, i have managed to print the "Enter a number: " statement from the process on the console through InputStream and write the input entered by the user through OutputStream. I am unable to print the last statements on the screen, which should be

您输入的是： + userinput

"You entered : " + userinput

我的代码是：

String command [] = {"java" , "-cp", "C:\\Users\\Mahika\\Documents\\NetBeansProjects\\JavaTest\\compilerTest", "InputInteger"};
ProcessBuilder pb = new ProcessBuilder(command);
Process p = pb.start();
System.out.println("Process started");
BufferedReader br = new BufferedReader (new InputStreamReader(p.getInputStream()));
String output = null;

while((output = br.readLine()) != null){
    System.out.println(output);
    break;
}
Scanner sc = new Scanner(System.in);
int i = sc.nextInt();

OutputStream os = p.getOutputStream();
PrintStream ps = new PrintStream(os);
os.write(i);
os.flush();  

我不知道如何使用 InputStream 再次阅读您输入的内容： +用户输入。

I don't know how to use InputStream again to read the "You entered:" + userinput.

推荐答案

这应该有效：

public static void main(String[] args) throws IOException {
    String command[] = {"java.exe", "-cp", "C:\\Users\\Mahika\\Documents\\NetBeansProjects\\JavaTest\\compilerTest", "InputInteger"};
    ProcessBuilder pb = new ProcessBuilder(command);
    Process p = pb.start();
    System.out.println("Process started");
    BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
    System.out.println(br.readLine());
    Scanner sc = new Scanner(System.in);
    int i = sc.nextInt();
    PrintStream ps = new PrintStream(p.getOutputStream(), true);
    ps.println(i);
    System.out.println(br.readLine());
}

只需确保在 InputInteger中输入提示类由换行符完成（例如，由 println 创建，而不是由 print 创建）。

Just make sure that input prompt in InputInteger class is finished by a newline character (e.g. created by println and not print).

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