如何从java执行R脚本文件

Question

我想从 Java 调用 R 脚本。 我已经对这个主题进行了谷歌搜索，但几乎所有我看到的结果都需要我向某些第三方库添加依赖项。 任何人都可以向我展示一种在不向我的代码中添加任何依赖项的情况下完成相同事情的好方法吗？

我正在设置一个新的应用程序，它使用以下行从 java 运行 R 脚本文件

Runtime.getRuntime().exec("C:\\Users\\Thiru\\Desktop helloWorld.R");

但是当我运行应用程序时，我收到以下异常：

SEVERE: Servlet.service() for servlet [RenjinServlet] in context with 
path 
[/REngineCheck] threw exception
java.io.IOException: Cannot run program "C:\Users\Thiru\Desktop": 
CreateProcess error=5, Access is denied
at java.lang.ProcessBuilder.start(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at org.r.Check.RenjinServlet.doGet(RenjinServlet.java:102)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at 

org.apache.catalina.core.ApplicationFilterChain.internalDoFilter 
(ApplicationFilterChain.java:291)
at 
org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter (WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter 
(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter 
(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke 
(StandardWrapperValve.java:217)
at org.apache.catalina.core.StandardContextValve.invoke 
(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke 
(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke 
(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke 
(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke 
(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke 
(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service 
(CoyoteAdapter.java:518)
at org.apache.coyote.http11.AbstractHttp11Processor.process 
(AbstractHttp11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process 
(AbstractProtocol.java:673)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun 
(NioEndpoint.java:1500)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run 
 (NioEndpoint.java:1456)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run 
  (TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: CreateProcess error=5, Access is denied
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(Unknown Source)
at java.lang.ProcessImpl.start(Unknown Source)
... 28 more

Answer 1

你应该在括号中设置你的路径

("your_path\\Rscript.exe your_path\\filename.R")

如果设置了环境，就可以使用Rscript

例子：

Runtime.getRuntime().exec("C:\\Program Files\\R\\R-3.6.1\\bin\\x64\\Rscript.exe C:\\Users\\Thiru\\Desktop\\helloWorld.R");