java调用R

下载

Download R 3.6.0 for Windows

https://cran.r-project.org/bin/windows/base/

安装打开Rgui.exe

D:\Program Files\R\R-3.6.0\bin\x64

命令提示符输出

脚本文件test.R

# My first program in R Programming
myString <- "Hello, World!"

print ( myString)

启动Rserver

> library(Rserve)

> Rserve()

pom.xml

<!-- https://mvnrepository.com/artifact/org.rosuda.REngine/Rserve -->
        <dependency>
            <groupId>org.rosuda.REngine</groupId>
            <artifactId>Rserve</artifactId>
            <version>1.8.1</version>
        </dependency>

Test.java

import org.rosuda.REngine.REXP;
import org.rosuda.REngine.Rserve.RConnection;

public class Test {
    public static void main(String[] args) {
        try {
            RConnection c = new RConnection();
            REXP x = c.eval("R.version.string");
            System.out.println(x.asString());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

新建程序脚本myAdd.R

myAdd<-function(x,y){ sum=x+y; return(sum)}

java调用myAdd

/**
 * @author Moses
 * @Date 2019/4/29
 */

import org.rosuda.REngine.REXP;
import org.rosuda.REngine.Rserve.RConnection;

public class Test {
    public static void main(String[] args) {
        try {
            RConnection c = new RConnection();
            REXP x = c.eval("R.version.string");
            System.out.println(x.asString());
            c.eval("source('D:/temp/myAdd.R')");
            int num1 = 20;
            int num2 = 10;
            int sum = c.eval("myAdd(" + num1 + "," + num2 + ")").asInteger();
            System.out.println("the sum=" + sum);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}