Java如何自动启动CityEngine并运行python代码

要在Java中自动启动CityEngine并运行Python代码，可以使用Java中的ProcessBuilder类和Runtime类来实现。以下是一个基本的实现示例：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class CityEnginePythonRunner {

    public static void main(String[] args) throws IOException, InterruptedException {

        // 设置CityEngine路径和Python脚本路径
        String cityenginePath = "C:/Program Files (x86)/CityEngine 2019.0/CityEngine.exe";
        String pythonScriptPath = "C:/path/to/python_script.py";

        // 启动CityEngine
        ProcessBuilder pb = new ProcessBuilder(cityenginePath);
        Process process = pb.start();

        // 获取CityEngine进程的输出流，用于读取输出信息
        BufferedReader input = new BufferedReader(new InputStreamReader(process.getInputStream()));

        // 等待CityEngine启动完成并输出信息
        String line;
        while ((line = input.readLine()) != null) {
            System.out.println(line);
            if (line.contains("CityEngine is ready.")) {
                break;
            }
        }

        // 关闭CityEngine进程的输出流
        input.close();

        // 执行Python脚本
        Runtime runtime = Runtime.getRuntime();
        String command = "python " + pythonScriptPath;
        Process pythonProcess = runtime.exec(command);

        // 获取Python进程的输出流，用于读取输出信息
        BufferedReader pythonInput = new BufferedReader(new InputStreamReader(pythonProcess.getInputStream()));
        while ((line = pythonInput.readLine()) != null) {
            System.out.println(line);
        }

        // 关闭Python进程的输出流
        pythonInput.close();

        // 等待Python进程执行完成
        pythonProcess.waitFor();

        // 关闭CityEngine进程
        process.destroy();
    }
}

在上述示例中，我们使用ProcessBuilder类启动了CityEngine进程，并通过读取输出流来等待CityEngine启动完成并输出信息。然后使用Runtime类执行Python脚本，并通过读取Python进程的输出流来获取执行结果。最后，关闭Python进程的输出流和CityEngine进程。需要注意的是，这里只是一个基本的示例，具体实现还需要根据实际情况进行优化和改进。