[英]How to pass data from java to python script as parameter
我想從 java 類運行腳本。 我能夠用ProcessBuilder
做到這一點。 現在我正在努力將數據作為參數傳遞給腳本。 我可以傳遞一個字符串,但我無法傳遞數據列表(從 CSV 文件讀取的數據)。 我嘗試過的一種方法是使用StringBuffer
並將數據作為Bytes
傳遞
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();
我無法將sb.toString().getBytes("UTF-8")
傳遞給流程構建器。 我得到java.lang.ArrayStoreException
另一方面,如果我通過sb.toString()
,我得到
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.
我如何閱讀我在 python 中傳遞的內容?
這甚至是傳遞數據(行 X 列)的正確方法嗎?
謝謝
您可以嘗試以下代碼::
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);
}
}
}
希望它會對你有所幫助
您可以將 args 作為數組傳遞。:
最終字符串 PYTHON = "python";
final String SCRIPT_PATH = new File("Pyscript.py").getPath();
final String ACTION = "-aexport";
最終字符串[] CMD_ARRAY = {PYTHON, SCRIPT_PATH, ACTION};
ProcessBuilder processBuilder = new ProcessBuilder(CMD_ARRAY);
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