是否有内置功能可从设定阅读器读取？

Question

Nashorn allows us to write to the writer which the engine uses via print() function. Is there a way to read from the reader using a built-in function?
Example:

Socket input=new Socket("stackoverflow.com", 1234);  
Socket output=new Socket("stackoverflow.com", 4321);  
engine.getContext().setWriter(new InputStreamReader(input.getInputStream())); //Changing to Socket input's reader from default one, which should be System.in.  
engine.getContext().setWriter(new OutputStreamWriter(s.getOutputStream())); //Changing from System.out to Socket output's output stream.

In that case, if I use print("hello"), Socket output will receive the message. But how can I read what Socket input sends?

Answer 1

When you use setReader and setWriter on the ScriptContext, you are setting the default input and output streams for the Javascript context. So, what you are doing here is configuring Javascript to read from and write to socket streams.

How those streams are made available to the Javascript code will depend on the JS environment / libraries you are using. However, with Node.js, you can see them as process.stdin and process.stdout .

FWIW, access to stdin / stdout is not supported in the standard ECMAScript libraries.