java - Jython - 集成 Java 和 Python

Question

我有示例 python 文件，我需要通过 java 程序调用它。因为这是我正在使用的Jython.

Pom 依赖

<dependency>
    <groupId>org.python</groupId>
    <artifactId>jython-standalone</artifactId>
    <version>2.7.0</version>
</dependency>

Java 文件

公共类 JythonIntegrationTest {

    public static void main(String[] args) throws FileNotFoundException , ScriptException {
        StringWriter writer = new StringWriter();

        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptContext context = new SimpleScriptContext();

        context.setWriter(writer);
        ScriptEngine engine = manager.getEngineByName("python");
        engine.eval(new FileReader("D:\\python\\sample.py") , context);
        System.out.println(writer.toString());
    }
}

当我运行这个程序时，我得到以下错误：-

线是 -manager.getEngineByName("python");

Exception in thread "main" java.lang.NullPointerException
    at maven_test.maven_test.JythonIntegrationTest.main(JythonIntegrationTest.java:38)

我需要在系统上运行一些 python exe/服务吗？