使用Java中的httpRequests发送asynch / await .NET 4.5吗？

Question

Is there a java equivalent of the following asynch/await .NET 4.5 code to handle httprequests or really any invoked method call)?

public async Task<System.IO.TextReader> DoRequestAsync(string url)
{
    HttpWebRequest req = HttpWebRequest.CreateHttp(url);
    req.AllowReadStreamBuffering = true;
    var tr = await DoRequestAsync(req);  // <- Wait here and even do some work if you want.
    doWorkWhilewaiting();                // ...look ma' no callbacks.
    return tr;
}

I was planning on calling this within a controller /GET method (to get data from 3rd partyl REST endpoint) and I'm completely new to the java world.

Any information is greatly appreciated.

Answer 1

No, Java doesn't have anything like async/await. The java.util.concurrent package contains various helpful classes around concurrency (for thread pools, producer/consumer queues etc) but really it's the language support in C# 5 that ties everything together... and that's just not present in Java yet.

It's not part of the plans for Java 8 either, as far as I can tell - although things like method literals and lambda expressions will at least make the explicit callback approach a lot simpler than it is in Java 7.