Question

首先，我想说我读了关于apache commons exec的所有其他主题。我有一个基于终端的可执行文件运行时，它会提示用户从命令行输入一些内容。我需要从我的java程序中运行这个程序并将一些命令提供给程序。我使用apache commons exec。这就是我到目前为止所做的：

CommandLine command = new CommandLine("myExec");
DefaultExecuteResultHandler resultHandler = new DefaultExecuteResultHandler();
DefaultExecutor executor = new DefaultExecutor();
ShutdownHookProcessDestroyer processDestroyer = new ShutdownHookProcessDestroyer();
TextareaOutputStream outputstream = new TextareaOutputStream(jTextArea1); //this redirects the output to a text area by extending and overriding outputstream. Works perfect.
PumpStreamHandler streamHandler = new PumpStreamHandler(outputstream, outputstream);
executor.setStreamHandler(streamHandler);
OutputStream out = new ByteArrayOutputStream();
executor.getStreamHandler().setProcessInputStream(out);
executor.setProcessDestroyer(processDestroyer);
executor.execute(command, resultHandler);
out.write("myFile.dat\n".getBytes());

这不起作用。一旦我的程序启动就崩溃了：

forrtl: severe (24): end-of-file during read, unit 5, file stdin

我也尝试过使用pipedinputstream - ＆gt; Trouble providing multiple input to a Command using Apache Commons Exec and extracting output：

CommandLine command = new CommandLine("myExec");
DefaultExecuteResultHandler resultHandler = new DefaultExecuteResultHandler();
DefaultExecutor executor = new DefaultExecutor();
ShutdownHookProcessDestroyer processDestroyer = new ShutdownHookProcessDestroyer();
TextareaOutputStream outputstream = new TextareaOutputStream(jTextArea1); //this redirects the output to a text area by extending and overriding outputstream. Works perfect.
PipedInputStream stdin = new PipedInputStream();
BufferedOutputStream processInput = new BufferedOutputStream(new PipedOutputStream(stdin));
PumpStreamHandler streamHandler = new PumpStreamHandler(outputstream, outputstream, stdin);
executor.setStreamHandler(streamHandler);
executor.setProcessDestroyer(processDestroyer);
executor.execute(command, resultHandler);
processInput.write("myFile.dat\n".getBytes());
processInput.flush();

有了这个，它会挂起第一个提示！好像flush（）没有效果。终端程序永远不会得到任何东西。

我也尝试过这个想法：How to pipe a string argument to an executable launched with Apache Commons Exec?

如果我在启动exec之前在ByteArrayInputStream中写入所有内容，那么它就可以了。如果我启动exec然后尝试写一些东西，那么我再次得到第一个错误。

真的很感激任何帮助。

为了完整性（我没有写这个，我不记得我从互联网上得到它）。这是为了将输出重定向到jTextArea：

import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;

class TextareaOutputStream extends OutputStream {

private final JTextArea area;
private final StringBuffer buf = new StringBuffer(128);


public TextareaOutputStream(final JTextArea area) throws IOException {
    this.area = area;
}

@Override
public void write(int c) throws IOException {
    // append character to buffer
    buf.append((char) c);
    // and newline appends to textarea
    if (c == '\n' || c == ':') {
        flush();
    }
}

@Override
public void close() {
    flush();
}

@Override
public void flush() {
    SwingUtilities.invokeLater(new Runnable() {

        String str = buf.toString();

        @Override
        public void run() {
            area.append(str);
        }
    });
    buf.setLength(0);
}

public void message(String msg) {
    if (buf.charAt(buf.length() - 1) != '\n') {
        buf.append('\n');
    }
    buf.append(msg);
    buf.append('\n');
    flush();
}

}

Apache commons exec运行交互式终端应用程序

0 个答案: