[英]python script runs on its own through terminal but not when it's executed in Java with Runtime.getRuntime().exec()
[英]How to start a python program using java (Runtime.getRuntime().exec())
我正在編寫一個程序,該程序需要在 java 代碼的 rest 代碼運行之前啟動 python 腳本。 但是,我找不到解決問題的方法。 如果有人可以提出解決我面臨的問題的方法,我將不勝感激。
代碼(我需要在注釋“start python”下的部分幫助):
import java.io.IOException;
//makes it easier for user to
//select game/start python
public class gameselect {
public static void main(String args[]) throws IOException {
//start python
try {
String cmd = "python ngramcount.py";
Process process = Runtime.getRuntime().exec(cmd);
process.getInputStream();
}
catch (IOException e) {
e.printStackTrace();
}
//select game
try {
Scanner in = new Scanner (System.in);
game1 g = new game1();
game2 f = new game2();
int choice = 0;
System.out.println("Welcome to TranslateGame!");
System.out.println("Type 1 for game1 (words) or 2 for game2 (phrases)");
while (choice != 1 && choice != 2) {
choice = in.nextInt();
if (choice != 1 && choice != 2) {
System.out.println("No game associated with that number.");
}
}
if (choice == 1) {
g.game1();
}
else if (choice == 2) {
f.game2();
}
}
catch(IOException e) {
System.out.println("No.");
}
}
}
這是一些您可能可以開始工作的代碼。 我還對其進行了評論並提供了一些參考鏈接,以幫助您了解代碼在做什么。
public static void main(String[] args) throws IOException {
// I'm using the absolute path for my example.
String fileName = "C:\\Users\\yourname\\Desktop\\testing.py";
// Creates a ProcessBuilder
// doc: https://docs.oracle.com/javase/7/docs/api/java/lang/ProcessBuilder.html
ProcessBuilder pb = new ProcessBuilder("python", fileName);
pb.redirectErrorStream(true); // redirect error stream to a standard output stream
Process process = pb.start(); // Used to start the process
// Reads the output stream of the process.
BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line; // this will be used to read the output line by line. Helpful in troubleshooting.
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
}
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