无法通过 java 中的 Streams 向 CMD 发送命令

Question

我正在尝试通过 CMD 打开一个应用程序 (RCMIClient.exe)。我能够打开 CMD，但无法读取或向 CMD 写入命令。下面是代码，没有错误，它只是打开CMD，什么都不做，但是当我手动关闭CMD时，我得到了以下错误。

null
Exception in thread "main" 
java.io.IOException: Stream closed
at java.lang.ProcessBuilder$NullOutputStream.write(ProcessBuilder.java:433)
at java.io.OutputStream.write(OutputStream.java:116)
at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:221)
at sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:291)
at sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:295)
at sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:141)
at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:229)
at java.io.BufferedWriter.flush(BufferedWriter.java:254)
at test.test.main(test.java:36)

代码：

public static void main(String[] args) throws IOException, InterruptedException {
    File f = new File("C:\\WDGSIMTools\\Anite\\RCMI\\Samples\\Release");
    ProcessBuilder pb = new ProcessBuilder("cmd.exe","/c","start").directory(f);
    pb.redirectErrorStream(true);
    Process p = pb.start();
    BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
    BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(p.getOutputStream()));
    BufferedReader error = new BufferedReader(new InputStreamReader(p.getErrorStream()));
    StringBuilder output = new StringBuilder();
    String line;
    String errline;
    errline = error.readLine();
    System.out.println(errline);

    while((line=reader.readLine())!=null) {
        output.append(line);

    }
    //To test whether its reading CMD contents
    System.out.println(output);

    //send commands to CMD 
    writer.write("RCMIClient.exe"+"\n");
    writer.flush();
    writer.write("1"+"\n");
    writer.close();
    reader.close();


}

Answer 1

cmd.exe /c start 将启动一个子进程然后关闭。

您正在尝试将输入定向到原始 cmd（已关闭）。

您应该调用cmd.exe /C RCMIClient.exe