Question

需要建议如何在Java中实现管道。例如，

echo "test"|wc

我需要显示上述管道示例的结果。

我试过这个：

public class myRunner {

  private static final String[] cmd = new String[] {"wc"};
  public static void main(String[] args){       
    try {
        ProcessBuilder pb = new ProcessBuilder( cmd );
        pb.redirectErrorStream(true);           
        Process process = pb.start();
        OutputStream os = process.getOutputStream();
        os.write("echo test".getBytes() );
        os.close();
    }catch (IOException e){
        e.printStackTrace();
    }

如何查看wc输出的输出？

我相信我可以使用的另一个库是PipedInputStream / PipedOutputStream。谁能展示一个如何使用它的例子？我很困惑。感谢

Answer 1

如何查看wc输出的输出？

通过使用Process's输出，通过Process.getInputStream()并从中读取。

Answer 2

public ArrayList<String> executorPiped(String[] cmd, String outputOld){
    String s=null;
    ArrayList<String> out=new ArrayList<String>();

    try {
        ProcessBuilder pb = new ProcessBuilder( cmd );
        pb.redirectErrorStream(true);
        Process p = pb.start();
        OutputStream os = p.getOutputStream();
        os.write(outputOld.getBytes());
        os.close();

        BufferedReader stdInput = new BufferedReader(new
                InputStreamReader(p.getInputStream()));

        BufferedReader stdError = new BufferedReader(new
                InputStreamReader(p.getErrorStream()));

        while ((s = stdInput.readLine()) != null) {
            out.add(s);
        }
    }catch (IOException io){

    }
    return out;
}

用Java实现管道

2 个答案: