Java 调用外部 Haskell 可执行文件时文件路径问题的解决方案

import System.IO
import Control.Monad
import Data.List

main = do  
    handle <- openFile "test2.txt" ReadMode -- 这里直接引用 "test2.txt"
    contents <- hGetContents handle
    let sas = words contents
    putStrLn (unwords sas)

import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException {
        String str = "1 13 23";
        // Java向特定绝对路径写入文件
        BufferedWriter writer = new BufferedWriter(new FileWriter("C:\Users\dabch\OneDrive\Desktop\chepuch\chich\test2.txt"));
        writer.write(str);
        writer.close();

        // Java执行Haskell程序
        Process p = Runtime.getRuntime().exec("C:\Users\dabch\OneDrive\Desktop\chepuch\chich\hello.exe");

        // 读取Haskell程序的标准输出
        String s;
        BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));
        while((s=stdInput.readLine())!=null){
            System.out.println(s);
        }
    }
}

import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException, InterruptedException {
        String targetDirPath = "C:\Users\dabch\OneDrive\Desktop\chepuch\chich\";
        String helloExePath = targetDirPath + "hello.exe";
        String testFilePath = targetDirPath + "test2.txt";

        // 1. 确保目标目录存在
        File targetDir = new File(targetDirPath);
        if (!targetDir.exists() || !targetDir.isDirectory()) {
            System.err.println("错误：目标目录不存在或不是一个目录：" + targetDirPath);
            return;
        }

        // 2. Java向指定文件写入内容
        String str = "1 13 23";
        try (BufferedWriter writer = new BufferedWriter(new FileWriter(testFilePath))) {
            writer.write(str);
        } catch (IOException e) {
            System.err.println("写入文件失败：" + e.getMessage());
            return;
        }
        System.out.println("数据已写入：" + testFilePath);

        // 3. 使用 ProcessBuilder 调用 hello.exe 并指定其工作目录
        File exeFile = new File(helloExePath);
        ProcessBuilder pb = new ProcessBuilder(exeFile.toString());
        // 设置子进程的工作目录为其可执行文件所在的目录
        pb.directory(exeFile.getParentFile()); 
        // 继承父进程的I/O流，子进程的输出将直接显示在控制台
        pb.inheritIO(); 

        System.out.println("正在执行 Haskell 程序...");
        Process p = pb.start();

        // 等待子进程执行完毕
        int exitCode = p.waitFor(); 
        System.out.println("Haskell 程序执行完毕，退出码：" + exitCode);

        // 如果不使用 inheritIO()，则需要手动读取输出流，如下所示：
        /*
        BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));
        String s;
        while((s = stdInput.readLine()) != null){
            System.out.println("Haskell Output: " + s);
        }
        BufferedReader stdError = new BufferedReader(new InputStreamReader(p.getErrorStream()));
        while((s = stdError.readLine()) != null){
            System.err.println("Haskell Error: " + s);
        }
        */
    }
}