Question

我想从Java类运行脚本。我能够使用ProcessBuilder做到这一点。现在，我正在努力将数据作为参数传递给脚本。我可以传递字符串，但是在传递数据列表（从CSV文件读取的数据）时遇到麻烦。我尝试过的一种方法是使用StringBuffer并将数据作为Bytes

传递

    StringBuffer sb = new StringBuffer();
    ArrayList argsList = new ArrayList();

    // append the sb from record. 
    //convert it to bytes 
    //sb.toString() contains my data with a delimiter ';'

    // sb.toString().getBytes("UTF-8").toString()

    argsList.add(0,"Continuum/anaconda3/envs/sth/python");
    argsList.add(1,"python/test.py");
    argsList.add(2,"python/test.py");
    argsList.add(3,sb.toString().getBytes("UTF-8").toString())

    ProcessBuilder builder = new ProcessBuilder(argsList);

    Process p = builder.start();

我无法将sb.toString().getBytes("UTF-8")传递给流程生成器。我得到java.lang.ArrayStoreException

另一方面，如果我通过sb.toString()，我会得到

java.io.IOException: Cannot run program Continuum/anaconda3/envs/sth/python, CreateProcess error=206, The filename or extension is too long
add it to list of commands to process builder.

如何阅读在python中传递的内容？

这是传递数据（第X列）的正确方法吗？

谢谢

Answer 1

您可以尝试以下代码::

import java.io.*;

class RunPythonCommand {
    public static void main(String [] args) {
        try {

            String prg = "import sys\nprint int(sys.argv[1])+int(sys.argv[2])\n";
            BufferedWriter out = new BufferedWriter(new FileWriter("sample_code.py"));
            out.write(prg);
            out.close();
            int param1 = 10;
            int param2 = 32;

            ProcessBuilder pb = new ProcessBuilder("python", "sample_code.py", "" + param2, "" + param1);
            Process p = pb.start();

            BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
            int ret = new Integer(in.readLine()).intValue();
            System.out.println("value is : " + ret);
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}

希望对您有帮助

如何将数据作为参数从Java传递到python脚本

1 个答案: