Question

我编写了一个代码，用于编译和执行其他程序，如C ++，C或Java。编译和执行C ++文件已成功实现。我编写的程序可以编译java程序（这就是我为编译ProjectDetailQuantity创建ProcessBuilder的方法）。但问题是关于java代码执行。我创建了像

这样的processBuilder类

processBuilder = new ProcessBuilder("javac", fileName);

其中processBuilder = new ProcessBuilder("java", fileName);是哪个.class文件将被执行。然后我设置了工作目录，inputfile路径和outputFilePath。但是fileName是非零的，即1.在我的情况下是exit code Bellow我已经提供了我写的执行方法。

RUN_TIME_ERROR

我正在尝试执行一个非常简单的程序。

public CompileStatus execute(ProcessBuilder processBuilder, String fileLocation,
                             String inputFilePath, String outputFilePath,
                             long timeInMillis) {

    processBuilder.redirectErrorStream(true);
    processBuilder.directory(new File(fileLocation));
    processBuilder.redirectInput(new File(inputFilePath));
    processBuilder.redirectOutput(new File(outputFilePath));

    try {
        Process process = processBuilder.start();
        if (!process.waitFor(timeInMillis, TimeUnit.MILLISECONDS))
            return CompileStatus.TIME_LIMIT_EXIT;
        int exitCode = process.exitValue();
        if (exitCode != 0) {
            logger.info("Exit code {}", exitCode);
            return CompileStatus.RUN_TIME_ERROR;
        }
    } catch (Exception e) {
        logger.info("{}", e);
        return CompileStatus.EXECUTION_ERROR;
    }

    return CompileStatus.EXECUTION_SUCCESS;
}

我在这里缺少什么？

====== UPDATE ==

public class C { public static final void main(String... args) { Scanner in = new Scanner(System.in); int i = in.nextInt(); System.out.println(i); } }包含文本文件路径，该路径将作为java程序inputFilePath的输入。并且C包含文本文件路径，其中包含程序outputFilePath的输出。

如果我在C指示的文件中放入1，则程序inputFilePath的输出将存储在C指示的文件中。该文件应该包含1.但此时文件中没有任何内容由outputFilePath指示，因为执行时出错。我检查了错误输入流但没有任何内容。但退出代码是程序outputFilePath是1.

为了方便起见，我把日志放了。

[http-nio-8080-exec-4] INFO com.broj.controller.CompileRestController - userName loti, srcType java, srcFile /home/seal/test/C.java, inputFile /home/seal/test/in1.txt, outputFile Test [http-nio-8080-exec-4] INFO com.broj.service.engine.CompilerImpl - Code compilation started... [http-nio-8080-exec-4] INFO com.broj.service.engine.CompilerImpl - file location, /home/seal/test [http-nio-8080-exec-4] INFO com.broj.service.CompileImpl - COMPILE_SUCCESS [http-nio-8080-exec-4] INFO com.broj.service.engine.ProcessBuilderFactory - Language java [http-nio-8080-exec-4] INFO com.broj.service.engine.ProcessBuilderFactory - File name C [http-nio-8080-exec-4] INFO com.broj.service.engine.CompilerImpl - Execution started [http-nio-8080-exec-4] INFO com.broj.service.engine.CompilerImpl - file location, /home/seal/test [http-nio-8080-exec-4] INFO com.broj.service.engine.CompilerImpl - input file path, /home/seal/test/in1.txt [http-nio-8080-exec-4] INFO com.broj.service.engine.CompilerImpl - output file path /home/seal/test/out.txt [http-nio-8080-exec-4] INFO com.broj.service.engine.CompilerImpl - Exit code 1 [http-nio-8080-exec-4] INFO com.broj.service.CompileImpl - Execution status RUN_TIME_ERROR工厂类。

ProcessBuilder

======更新==

输出文件的内容

public class ProcessBuilderFactory {

private static final Logger logger = LoggerFactory.getLogger(ProcessBuilderFactory.class);

public static ProcessBuilder getProcessBuilderForCompile(String language, String fileName, String targetFileName) {
    ProcessBuilder processBuilder = null;
    if (Language.CPP.equalsIgnoreCase(language))
        processBuilder = new ProcessBuilder("g++", fileName, "-o", targetFileName);//not support c++11 so far
    else if (Language.JAVA.equalsIgnoreCase(language))
        processBuilder = new ProcessBuilder("javac", fileName);

    return processBuilder;
}

public static ProcessBuilder getProcessBuilderForExecution(String language, String fileName) {
    logger.info("Language {}", language);
    logger.info("File name {}", fileName);
    ProcessBuilder processBuilder = null;
    if (Language.CPP.equalsIgnoreCase(language))
        processBuilder = new ProcessBuilder("./" + fileName);
    else if (Language.JAVA.equalsIgnoreCase(language))
        processBuilder = new ProcessBuilder("java", fileName);

    return processBuilder;
}
}

无法使用java processBuilder执行java程序

0 个答案: