blocks|key|38851|text|要从Java本地调用R，您需要JRI。要远程调用Java，可以使用RServe。如果你想处理图形，最好使用R中的一些东西，比如evaluate包。Afaik大多数语言桥没有提供处理图形的特殊功能，您需要在R级别上处理图形。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|38852|在开始了解使用跨语言桥进行科学计算的挑战和限制之前，请先了解一下this+paper。以后你就省去了很多麻烦。|offset|length|38853|entityMap|0|LINK|mutability|MUTABLE|url|http://arxiv.org/pdf/1406.4806.pdf^0|0|W|A|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

To locally call R from Java, you need JRI. To remotely call Java you can use RServe. If you want to handle graphics, that is best done using something in R such as the evaluate package. Afaik most language bridges offer no particular functionality for handling graphics, you will need to do that on the R level. 

Have a look at <a href="http://arxiv.org/pdf/1406.4806.pdf" rel="nofollow">this paper</a> before you get started to be aware of the challenges and limitations of using cross language bridges for scientific computing. You'll save yourself a lot of trouble down the line.

blocks|key|2719294|text|您还可以考虑FastR，这是R的一个基于GraalVM的实现。这是Swing应用程序的屏幕截图，显示了R的点阵图。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2719295|​|2719296|📷|atomic|offset|length|2719297|2719298|FastR可以像这样嵌入：|2719299|Context+ctx+=+Context.newBuilder("R").allowAllAccess(true).build();
ctx.eval("R",+"sum").execute(new+int[]+{1,2,3});|code-block|syntax|javascript|2719300|您可以指示R脚本绘制到给定的Graphics2D对象中：|style|CODE|2719301|ctx.eval("R",+"function(g)+awt(g,+400,+400)").execute(myGraphics2DObject)
ctx.eval("R",+"grid.points(1:10)")|2719302|完整的示例在GitHub上：https://github.com/graalvm/examples/tree/master/fastr_javaui|2719303|有关FastR的更多信息，请访问：https://medium.com/graalvm/faster-r-with-fastr-4b8db0e0dceb|2719304|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/66d91818ed29b7239cc8093eff2e718f.png|imageAlt|1|LINK|MUTABLE|url|https://github.com/graalvm/examples/tree/master/fastr_javaui|2|https://medium.com/graalvm/faster-r-with-fastr-4b8db0e0dceb^0|0|0|0|1|0|0|0|0|0|E|A|0|0|E|1O|1|0|H|1N|2|0^^$0|@$1|2|3|4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1H|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1I|8|@]|9|@$G|1J|H|1K|1|1L]]|A|$]]|$1|I|3|C|5|6|7|1M|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1N|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|1O|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|1P|8|@$G|1Q|H|1R|S|T]]|9|@]|A|$]]|$1|U|3|V|5|N|7|1S|8|@]|9|@]|A|$O|P]]|$1|W|3|X|5|6|7|1T|8|@]|9|@$G|1U|H|1V|1|1W]]|A|$]]|$1|Y|3|Z|5|6|7|1X|8|@]|9|@$G|1Y|H|1Z|1|20]]|A|$]]|$1|10|3|-4|5|6|7|21|8|@]|9|@]|A|$]]]|11|$12|$5|13|14|15|A|$16|17|18|-4]]|19|$5|1A|14|1B|A|$1C|1D]]|1E|$5|1A|14|1B|A|$1C|1F]]]]

You can also consider FastR, a GraalVM based implementation of R. This is a screenshot from Swing application showing a lattice plot from R.

<a href="https://i.stack.imgur.com/GHRUA.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GHRUA.png" alt="enter image description here"></a>

FastR can be embedded like so:

<pre><code>Context ctx = Context.newBuilder("R").allowAllAccess(true).build();
ctx.eval("R", "sum").execute(new int[] {1,2,3});
</code></pre>

You can instruct the R script to plot into given <code>Graphics2D</code> object:

<pre><code>ctx.eval("R", "function(g) awt(g, 400, 400)").execute(myGraphics2DObject)
ctx.eval("R", "grid.points(1:10)")
</code></pre>

The full example is on GitHub: <a href="https://github.com/graalvm/examples/tree/master/fastr_javaui" rel="nofollow noreferrer">https://github.com/graalvm/examples/tree/master/fastr_javaui</a>

More info about FastR: <a href="https://medium.com/graalvm/faster-r-with-fastr-4b8db0e0dceb" rel="nofollow noreferrer">https://medium.com/graalvm/faster-r-with-fastr-4b8db0e0dceb</a>

I know there are multiple questions resembling this one but most of them are &gt;2 years old and actually not that related.
What I need to do is fully integrate the R environment in an existing java (actually scala) application. I don't want any R-based web solutions like Rook, Rapache and the like, the server logic happens strictly in java land. What I need is a way to send R commands to the interpreter, let it run them and handle the output. More importantly, I need to be able to:
<ol>
<li>Run commands interactively not only ready-made R scripts.
</li>
<li>Produce and handle graphics from the established graphics packages.
</li>
<li>Communicate raw data back and forth between the JVM and R interpreter.
I am aware of <a href="http://www.rforge.net/JRI/" rel="nofollow noreferrer">JRI</a>. I would very much appreciate to hear from anyone who has used it. How stable is it? How actively maintained is the project? Any existing code that I can look at? Any other alternatives out there?
</li>
</ol>

Integrate R in java web application

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我知道有很多类似这个问题的问题，但大多数都是2岁以上的问题，而且实际上没有太大的关系。我需要做的是将R环境完全集成到现有的java (实际上是scala)应用程序中。我不想要任何像Rook，Rapache之类的基于R的web解决方案，服务器逻辑完全发生在java领域。我需要的是一种将R命令发送到解释器，让它运行它们并处...

问在java web应用程序中集成R
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