用于连接和执行db2命令的JavaFX

Question

JavaFx - 我需要执行db2cw.bat驱动程序，然后执行

1. 更改目录
2. 执行.cmd文件
3. 执行db2 EXPORT命令
4. 处理完导出后，关闭窗口

我在代码中使用了Processbuilder。 db2cw.bat从目录cwd成功打开，并执行dbc命令以连接到DB2。但是下一个命令因IO异常而失败。我应该如何将Export命令传递给命令行？

java.io.IOException: The pipe is being closed

代码

        List<String> list = new ArrayList<String>();
        list.add(cmd); // path to db2cw.bat
        list.add(dbc); // path to .cmd file for DB2 connection
        list.add(exp); // path to db2EXPORT command
        ProcessBuilder builder = new ProcessBuilder(list); 
        Process p = null;
        builder.directory(new File(cwd));
        try {
            p = builder.start();
            p.waitFor();
        } catch (IOException e) {
            System.out.println(e);
        }
        //get stdin of shell
        BufferedWriter p_stdin = new BufferedWriter(new OutputStreamWriter(p.getOutputStream()));

        try {
            p_stdin.write(exp);
            System.out.println(cwd);
            p_stdin.newLine();
            p_stdin.flush();
        } catch (IOException e) {
            System.out.println(e);
            System.out.println("Export Error");
        }

        try {
            p_stdin.write("exit");
            p_stdin.newLine();
            p_stdin.flush();
        } catch (IOException e) {
            System.out.println(e);
            System.out.println("Exit Error");
        }

    } catch (Exception e) {
        e.printStackTrace();
    }