用commons-exec流输出? [英] Streaming output with commons-exec?

问题描述

谁能给我一个例子，说明如何流式传输用DefaultExecutor执行的外部程序的输出?我找不到任何描述该操作方法的文档.

Can anyone give me an example of how to stream the output of an external program executed with DefaultExecutor? I'm not finding any documentation describing how to do this.

我的外部过程将运行几个小时，因此仅获取所有输出数据是不可行的；它必须流式传输.

My external process will run for several hours, so just grabbing all output data isn't feasible; it must be streamed.

推荐答案

注意:此解决方案是同步的，因此不会流式传输.您将需要在单独的线程中进行读取，或者使用execute命令的异步版本.

Note: this solution is synchronous, so it won't stream. You'll need to read is in a separate thread, or use the asynchronous version of the execute command.

private InputStream getStream() {

 String dataParsingCommand = "java";

PipedOutputStream output = new PipedOutputStream();
PumpStreamHandler psh = new PumpStreamHandler(output);

CommandLine cl = CommandLine.parse(command);
cl.addArgument("-jar");
cl.addArgument(dataParserPath);

DefaultExecutor exec = new DefaultExecutor();
DataInputStream is = null;
try {
    is = new DataInputStream(new PipedInputStream(output));
    exec.setStreamHandler(psh);
    exec.execute(dataParserCommandLine);
} catch (ExecuteException ex) {
} catch (IOException ex) {
}

return is;
}

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