从Java运行.py文件

我试图从java代码执行.py文件。 我将.py文件移动到我的java项目的默认目录中，并使用以下代码调用它：

String cmd = "python/"; String py = "file"; String run = "python " +cmd+ py + ".py"; System.out.println(run); //Runtime.getRuntime().exec(run); Process p = Runtime.getRuntime().exec("python file.py"); 

无论是使用变量运行，还是整个路径或“python file.py”，我的代码都在运行，显示消息构建成功总时间0秒而不执行file.py. 我的问题在这里是什么？

Answer 1

你也可以这样使用：

 String command = "python /c start python path\to\script\script.py"; Process p = Runtime.getRuntime().exec(command + param ); 

要么

 String prg = "import sys"; BufferedWriter out = new BufferedWriter(new FileWriter("path/a.py")); out.write(prg); out.close(); Process p = Runtime.getRuntime().exec("python path/a.py"); BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream())); String ret = in.readLine(); System.out.println("value is : "+ret); 

从Java运行Python脚本

Answer 2

我相信我们可以使用ProcessBuilder

 Runtime.getRuntime().exec("python "+cmd + py + ".py"); ..... since exec has its own process we can use that ProcessBuilder builder = new ProcessBuilder("python", py + ".py"); builder.directory(new File(cmd)); builder.redirectError(); .... Process newProcess = builder.start(); 

Answer 3

 String command = "cmd /c python "; Process p = Runtime.getRuntime().exec(command); p.waitFor(); BufferedReader bri = new BufferedReader(new InputStreamReader(p.getInputStream())); BufferedReader bre = new BufferedReader(new InputStreamReader(p.getErrorStream())); String line; while ((line = bri.readLine()) != null) { System.out.println(line); } bri.close(); while ((line = bre.readLine()) != null) { System.out.println(line); } bre.close(); p.waitFor(); System.out.println("Done."); p.destroy(); 

Answer 4

您可以运行python脚本

 Process p = Runtime.getRuntime().exec(PYTHON_ABSOLUTE_PATH, script_path) 

要获得PYTHON_ABSOLUTE_PATH，只需输入

 which python2.7 

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