java - 如何从 java 代码编译和运行 java 和 C 文件？

Question

我正在开发一个编辑器应用程序，我可以在其中编译和运行 c、cpp 和 Java 文件。我正在使用 java 编程语言开发此应用程序。我正在 Eclipse 中开发它。我可以在特定位置创建新文件(c、cpp 和 java)，也可以将文件保存到不同的 2 个位置。为了执行，我使用了以下方法。

String compileFileCommand = "javac "+fileName;

Process compile_process = new ProcessBuilder(compileFileCommand).redirectErrorStream(true).start();
compile_process.waitFor();

BufferedReader reader=new BufferedReader(new InputStreamReader(compile_process.getInputStream())); 
String line=reader.readLine(); 
while(line!=null) { 
    System.out.println(line); 
    line=reader.readLine(); 
} 

我的问题是我无法从相应位置编译文件。

总是给出异常

java.io.IOException: error=2, No such file or directory 

请告诉我如何编译和运行所有 c、c++ 和 java 文件。还请对我的申请提出任何其他建议。

编辑..我已经使用这两种方法进行编译和运行。在编译时，它会在 Java 的情况下创建一个类文件。但我一直从 InputStreams(getErrorStream() 和 getInputStream())中获取 null。

void compileJavaFile(String fileName)
    {
        String compileFileCommand = "javac " + fileName;
        try
        {
            System.out.println("Executing Java File");

            Process compileProcess = Runtime.getRuntime().exec(compileFileCommand);

            String line = "";
            BufferedReader bri = new BufferedReader(new InputStreamReader(compileProcess.getInputStream()));
            BufferedReader bre = new BufferedReader(new InputStreamReader(compileProcess.getErrorStream()));
            while ((line = bri.readLine()) != null)
            {
                System.out.println(line);
            }
            bri.close();
            while ((line = bre.readLine()) != null)
            {
                System.out.println(line);
            }
            bre.close();
            compileProcess.waitFor();
            System.out.println("Done.");
        } catch (Exception e)
        {
            // TODO: handle exception
            System.out.println("Exception ");
            System.out.println(e.getMessage());
        }
    }

    void runJavaFile(String fileName)
    {
        String runFileCommand = "java " + fileName.split(".java")[0];
        try
        {
            System.out.println("runFileCommand : " + runFileCommand);
            System.out.println("Running Java File");

            Process runProcess = Runtime.getRuntime().exec(runFileCommand);

            BufferedReader reader = new BufferedReader(new InputStreamReader(runProcess.getInputStream()));
            String line = reader.readLine();
            System.out.println("line = " + line);
            while (line != null)
            {
                System.out.println(line);
                line = reader.readLine();
            }

        } catch (Exception e)
        {
            // TODO: handle exception
            System.out.println("Exception ");
            System.out.println(e.getMessage());
        }
    }

对于 C 和 C++，我正在使用。

void compileCFile(String fileName)
    {
        String compileFileCommand = "gcc " + fileName;

        resultString = "";
        try
        {
            System.out.println("Compiling C File");

            Process processCompile = Runtime.getRuntime().exec(compileFileCommand);

            BufferedReader brCompileError = new BufferedReader(new InputStreamReader(processCompile.getErrorStream()));
            String errorCompile = brCompileError.readLine();
            if (errorCompile != null)
                System.out.println("Error Compiler = " + errorCompile);

            resultString += errorCompile +"\n";

            BufferedReader brCompileRun = new BufferedReader(new InputStreamReader(processCompile.getErrorStream()));
            String outputCompile = brCompileRun.readLine();
            if (outputCompile != null)
                System.out.println("Output Compiler = " + outputCompile);

            resultString += outputCompile +"\n";

        } catch (Exception e)
        {
            // TODO: handle exception
            System.out.println("Exception ");
            System.out.println(e.getMessage());
        }
    }

    void runCFile(String fileName)
    {
        String runFileCommand = "./" + fileName.split(".c")[0];

        try
        {

            System.out.println("Running C File");

            Process processRun = Runtime.getRuntime().exec(runFileCommand);

            BufferedReader brRun = new BufferedReader(new InputStreamReader(processRun.getErrorStream()));
            String errorRun = brRun.readLine();
            if (errorRun != null)
                System.out.println("Error Run = " + errorRun);

            BufferedReader brResult = new BufferedReader(new InputStreamReader(processRun.getInputStream()));
            String outputRun = brResult.readLine();
            if (outputRun != null)
                System.out.println("Output Run = " + outputRun);

        } catch (Exception e)
        {
            // TODO: handle exception
            System.out.println("Exception ");
            System.out.println(e.getMessage());
        }
    }

    void compileCPPFile(String fileName)
    {
        String compileFileCommand = "g++ " + fileName;
        try
        {

            System.out.println("Compiling CPP File");

            Process processCompile = Runtime.getRuntime().exec(compileFileCommand);

            BufferedReader brCompileError = new BufferedReader(new InputStreamReader(processCompile.getErrorStream()));
            String errorCompile = brCompileError.readLine();
            if (errorCompile != null)
                System.out.println("Error Compiler = " + errorCompile);

            resultString += errorCompile +"\n";

            BufferedReader brCompileRun = new BufferedReader(new InputStreamReader(processCompile.getErrorStream()));
            String outputCompile = brCompileRun.readLine();
            if (outputCompile != null)
                System.out.println("Output Compiler = " + outputCompile);

            resultString += outputCompile +"\n";

        } catch (Exception e)
        {
            // TODO: handle exception
            System.out.println("Exception ");
            System.out.println(e.getMessage());
        }
    }

    void runCPPFile(String fileName)
    {
        String runFileCommand = "./" + fileName.split(".cpp")[0];

        try
        {
            System.out.println("Running CPP File");

            Process processRun = Runtime.getRuntime().exec(runFileCommand);

            BufferedReader brRun = new BufferedReader(new InputStreamReader(processRun.getErrorStream()));
            String errorRun = brRun.readLine();
            if (errorRun != null)
                System.out.println("Error Run = " + errorRun);

            BufferedReader brResult = new BufferedReader(new InputStreamReader(processRun.getInputStream()));
            String outputRun = brResult.readLine();
            if (outputRun != null)
                System.out.println("Output Run = " + outputRun);

        } catch (Exception e)
        {
            // TODO: handle exception
            System.out.println("Exception ");
            System.out.println(e.getMessage());
        }
    }

如果是 C 和 C++，它会显示如下错误

g++: /media/disk/eclipse/\/UniversalIDE/CPP/firstCPP: No such file or directory

请给我解决我的问题..

Answer 1

请尝试以下，

Process p = Runtime.getRuntime().exec(command);

command 是您传递的字符串。在命令中，您可以传递“javac Test.java”来编译您的 java 文件，就像您可以使用其他命令一样。