Java ProcessBuilder waitfor()从不竞争

Question

这个问题已经有答案了:

process.waitFor() never returns (12 个回答)

已关闭 5 年前。

下面是我的代码。尝试执行 python 脚本但 waitfor() 从未完成。下面是我的代码。任何建议。

String[] command ={"CMD","C:\\Users\\vkode200\\IdeaProjects\\Pythonex1\\TestHello.py"}; 

         ProcessBuilder probuilder = new ProcessBuilder(command );
            //You can set up your work directory
            /*probuilder.directory(new File("c:\\xyzwsdemo"));*/

            Process process = probuilder.start();

            //Read out dir output
            InputStream is = process.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            String line;
            System.out.printf("Output of running %s is:\n",
                    Arrays.toString(command));
            /*while ((line = br.readLine()) != null) {
                System.out.println(line);
            }
*/
            //Wait to get exit value
            try {
                 exitValue = process.waitFor();
                 /*exitValue= process.exitValue();*/
                System.out.println("\n\nExit Value is " + exitValue);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

Answer 1

在调用 waitFor() 之前，您需要关闭进程的输入流，并在 stdout 和 stderr 上消耗其所有输出。

否则，尝试读取您未发送的输入或生成您未读取的输出时可能会被阻止。