从java启动R进程

我试图从Java启动R进程并重定向stdin和stdout。从java启动R进程

processBuilder = new ProcessBuilder().command("/usr/bin/R").redirectErrorStream(
      true); 
try { 
     Process p = processBuilder.start(); 
     OutputStream stdin = p.getOutputStream(); 
     InputStream stdout = p.getInputStream(); 

     BufferedReader reader = new BufferedReader (new InputStreamReader(stdout)); 
     BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(stdin)); 
     String line; 
     while ((line = reader.readLine()) != null) { 
      System.out.println ("Stdout: " + line); 
     } 

    } catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    }

我正在使用Java 1.6。当程序运行时，我得到以下错误：

标准输出：致命错误：你必须指定“--save”，“--no保存”或“--vanilla”

任何帮助将是不胜感激！谢谢！

来源

2013-11-26 BigONotation

为与R的错误？问题是使用R和Java编程问题？ – NormR

你不能没有这些选项中的一个具有重定向标准输入运行R：

R < foo.R 
Fatal error: you must specify '--save', '--no-save' or '--vanilla'

你想R键保存其工作数据时，其成品（--save）？还是不行（--no-save）？你可能会发现 - vanilla适合你的使用。

--vanilla 
      Combine --no-save, --no-restore, --no-site-file, --no-init-file and --no-environ

我不太知道如何将参数传递到Java的ProcessBuilder的事情，但也许它只是：

processBuilder = new ProcessBuilder().command("/usr/bin/R --vanilla").redirectErrorStream(
      true);

或者它有设定ARGS方法。

来源

2013-11-26 13:24:46 Spacedman

Spacedman感谢您的答案，它做了诀窍......我没有意识到错误信息来自R进程。 – BigONotation

这里是如何将参数传递至R同时发动它作为一个子进程：

public void startR() { 
    List<String> commandAndParams = new ArrayList<String>(); 
    commandAndParams.add("/usr/bin/R"); 
    commandAndParams.add("--vanilla"); 
    processBuilder = new ProcessBuilder().command(commandAndParams).redirectErrorStream(
      true); 
    try { 
     Process p = processBuilder.start(); 
     OutputStream stdin = p.getOutputStream(); 
     InputStream stdout = p.getInputStream(); 

     BufferedReader reader = new BufferedReader (new InputStreamReader(stdout)); 
     BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(stdin)); 
     String line; 
     while ((line = reader.readLine()) != null) { 
      System.out.println ("Stdout: " + line); 
     } 

    } catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
}

从而导致在输出为：

Stdout: 
Stdout: R version 3.0.1 (2013-05-16) -- "Good Sport" 
Stdout: Copyright (C) 2013 The R Foundation for Statistical Computing 
Stdout: Platform: x86_64-apple-darwin10.8.0 (64-bit) 
Stdout: 
Stdout: R is free software and comes with ABSOLUTELY NO WARRANTY. 
Stdout: You are welcome to redistribute it under certain conditions. 
Stdout: Type 'license()' or 'licence()' for distribution details. 
Stdout: 
Stdout: Natural language support but running in an English locale 
Stdout: 
Stdout: R is a collaborative project with many contributors. 
Stdout: Type 'contributors()' for more information and 
Stdout: 'citation()' on how to cite R or R packages in publications. 
Stdout: 
Stdout: Type 'demo()' for some demos, 'help()' for on-line help, or 
Stdout: 'help.start()' for an HTML browser interface to help. 
Stdout: Type 'q()' to quit R. 
Stdout:

来源

2013-11-27 00:36:44 BigONotation

从java启动R进程

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