无法从java程序执行R脚本？

我在字符串变量中有一个Rscript，我想从Java程序中执行它，并向它传递一些变量。如果我独立执行R脚本，它就可以正常工作。我使用Python程序将R脚本转换为一行，将其全部转义，如下所示：

import json

jsonstr = json.dumps({"script": """\
#!/usr/bin/Rscript

# read the data file
library('jsonlite')
library('rpart')

args <- as.list(Sys.getenv(c(
                        "path",
                        "client_users")))

if (args[["path"]]==""){
    args[["path"]] <- "."
}

# other stuff here
# other stuff here

"""})

print jsonstr

上面的代码可以与bashshell脚本配合使用。有什么我需要做的R脚本特别？对于bash脚本和R脚本，我也将使用相同的代码

这就是我得到的错误：

/bin/bash: line 7: -: No such file or directory /bin/bash: line 10: syntax error near unexpected token `'jsonlite'' /bin/bash: line 10: `library('jsonlite')' 

如果我删除commandList.add（“/bin/bash”）和add

commandList.add（“/bin/Rscript”）然后我看到以下错误：

Cannot run program "/bin/Rscript": error=2, No such file or directory

更新：-

我没有使用上面的脚本，而是决定在r中使用简单的print hell脚本，看看是否可以通过Java执行它

// this will print hello
String script = "#!/usr/bin/env Rscript\nsayHello <- function(){\n   print('hello')\n}\n\nsayHello()\n";

但是如果我用这个
commandList.add（“/bin/sh”）执行，我得到这个错误：

/bin/bash: line 2: syntax error near unexpected token `('
/bin/bash: line 2: `sayHello <- function(){'

/bin/sh: 2: Syntax error: "(" unexpected

您必须直接运行
/usr/bin/Rscript
。此外，此程序不会从标准输入读取脚本（您必须将脚本的路径指定为
Rscript
的参数），因此您必须：


创建一个临时文件
写剧本
使用Rscript执行脚本
删除临时文件（作为一种良好的编程实践）

例如，这是一个POC：

public static void main(String[] args) throws IOException, InterruptedException {

    // Your script
    String script = "#!/usr/bin/env Rscript\n" +
            "\n" +
            "sayHello <- function() {\n" +
            "    print('hello')\n" +
            "}\n" +
            "\n" +
            "sayHello()\n";

    // create a temp file and write your script to it
    File tempScript = File.createTempFile("test_r_scripts_", "");
    try(OutputStream output = new FileOutputStream(tempScript)) {
        output.write(script.getBytes());
    }

    // build the process object and start it
    List<String> commandList = new ArrayList<>();
    commandList.add("/usr/bin/Rscript");
    commandList.add(tempScript.getAbsolutePath());
    ProcessBuilder builder = new ProcessBuilder(commandList);
    builder.redirectErrorStream(true);
    Process shell = builder.start();

    // read the output and show it
    try(BufferedReader reader = new BufferedReader(
            new InputStreamReader(shell.getInputStream()))) {
        String line;
        while((line = reader.readLine()) != null) {
            System.out.println(line);
        }
    }

    // wait for the process to finish
    int exitCode = shell.waitFor();

    // delete your temp file
    tempScript.delete();

    // check the exit code (exit code = 0 usually means "executed ok")
    System.out.println("EXIT CODE: " + exitCode);
}

public static void main(String[] args) throws IOException, InterruptedException {

    // Your script
    String script = "#!/usr/bin/env Rscript\n" +
            "\n" +
            "sayHello <- function() {\n" +
            "    print('hello')\n" +
            "}\n" +
            "\n" +
            "sayHello()\n";

    // create a temp file and write your script to it
    File tempScript = File.createTempFile("test_r_scripts_", "");
    try(OutputStream output = new FileOutputStream(tempScript)) {
        output.write(script.getBytes());
    }

    // build the process object and start it
    List<String> commandList = new ArrayList<>();
    commandList.add("/usr/bin/Rscript");
    commandList.add(tempScript.getAbsolutePath());
    ProcessBuilder builder = new ProcessBuilder(commandList);
    builder.redirectErrorStream(true);
    Process shell = builder.start();

    // read the output and show it
    try(BufferedReader reader = new BufferedReader(
            new InputStreamReader(shell.getInputStream()))) {
        String line;
        while((line = reader.readLine()) != null) {
            System.out.println(line);
        }
    }

    // wait for the process to finish
    int exitCode = shell.waitFor();

    // delete your temp file
    tempScript.delete();

    // check the exit code (exit code = 0 usually means "executed ok")
    System.out.println("EXIT CODE: " + exitCode);
}

...

// create a temp file and write your script to it
File tempScript = File.createTempFile("test_r_scripts_", "");
tempScript.setExecutable(true);
try(OutputStream output = new FileOutputStream(tempScript)) {
    output.write(script.getBytes());
}

// build the process object and start it
List<String> commandList = new ArrayList<>();
commandList.add(tempScript.getAbsolutePath());
ProcessBuilder builder = new ProcessBuilder(commandList);

...