简单java程序在线测评程序

import java.io.BufferedReader;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.PrintStream;import java.io.PrintWriter;import java.io.StringWriter;import java.lang.reflect.Method;import java.net.URI;import java.util.Arrays;import java.util.regex.Matcher;import java.util.regex.Pattern;import javax.tools.Diagnostic;import javax.tools.DiagnosticCollector;import javax.tools.JavaCompiler;import javax.tools.JavaCompiler.CompilationTask;import javax.tools.JavaFileObject;import javax.tools.SimpleJavaFileObject;import javax.tools.StandardJavaFileManager;import javax.tools.StandardLocation;import javax.tools.ToolProvider;public class CompileAndRunJavaFile {    public static void main(String[] args) {        StringBuilder code = new StringBuilder();        try {            BufferedReader br = new BufferedReader(new FileReader(new File("测试程序地址")));            String content;            while((content = br.readLine()) != null){                code.append(content).append("\n");            }        } catch (Exception e) {            e.printStackTrace();        }        CompileAndRunJavaFile cr = new CompileAndRunJavaFile();        cr.compileAndRunJavaFile(code.toString());        if(cr.isCompileAndRunOK()) {            System.out.println("运行时间: " + cr.getUseTime() + "ms");            System.out.println("内存使用: " + cr.getUseMemory() + "kb9");            System.out.println("运行结果: \n" + cr.getOutMsg());        } else if(cr.isCompilerError()) {            System.out.println("编译错误: " + cr.getCE());        } else if(cr.isRunningError()) {            System.out.println("运行错误: " + cr.getError());        }    }    //编译错误    private StringBuilder ce = new StringBuilder();    public String getCE(){        return ce.toString();    }        //内存使用    private double useMemory = 0.0;    public double getUseMemory(){        return useMemory;    }        //运行时间    private long useTime = 0;    public long getUseTime(){        return useTime;    }    //输出信息    private StringBuilder outMsg = new StringBuilder();    public String getOutMsg(){        return outMsg.toString();    }    //异常信息    private String error = null;    public String getError(){        return error;    }    //是否正常编译并运行    private boolean isCompileAndRunOK = false;         public boolean isCompileAndRunOK(){        return isCompileAndRunOK;    }        //程序的运行时间, 单位：ms    private int limitTime = 2000;    //程序所占内存, 单位 ：KB    private double limitMemory = 256000.0;        public void setLimitTime(int limitTime){        this.limitTime = limitTime;    }        public void setLimitMemory(double limitMemory){        this.limitMemory = limitMemory;    }        //是否为编译错误    private boolean isCompilerError = false;    public boolean isCompilerError(){        return isCompilerError;    }        //是否为运行错误    private boolean isRunningError = false;    public boolean isRunningError(){        return isRunningError;    }        private static final String className = "Main";    private static final String methodName = "main";    private String getClassOutput(){        //设置class文件的存放位置        if(System.getProperty("java.class.path").contains("bin")) return "bin/";        else return "./";    }        private void compileAndRunJavaFile(String code){        PrintStream ps = null;        FileInputStream fis = null;        BufferedReader br = null;        //保存标准输出流        InputStream stdIn = System.in;        //保存标准输入流        PrintStream stdOut = System.out;                //为源代码导入默认的包        code = "import java.util.*;\n" + code;        try {            JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();            // define the diagnostic object, which will be used to save the            // diagnostic information            DiagnosticCollector
      
        oDiagnosticCollector = new DiagnosticCollector
       
        ();            StandardJavaFileManager fileManager = compiler.getStandardFileManager(oDiagnosticCollector, null, null);            // set class output location            fileManager.setLocation(StandardLocation.CLASS_OUTPUT, Arrays.asList(new File[] { new File(getClassOutput()) }));                        StringSourceJavaObject sourceObject = new CompileAndRunJavaFile.StringSourceJavaObject(className, code);            Iterable
         fileObjects = Arrays.asList(sourceObject);            CompilationTask task = compiler.getTask(null, fileManager, oDiagnosticCollector, null, null, fileObjects);            boolean result = task.call();                        if (result) {                Runtime runtime = Runtime.getRuntime();                Class
         clazz = Class.forName(className);                Method method = clazz.getMethod(methodName, new Class
        []{String[].class});                                //重置输入流， 需要存放数据文件的文件名                fis = new FileInputStream(new File("数据文件地址"));                System.setIn(fis);                //重置输出流，需要获得控制台的输出                ByteArrayOutputStream bao = new ByteArrayOutputStream();                ps = new PrintStream(bao);                System.setOut(ps);                                long startFreeMemory = runtime.freeMemory();//Java 虚拟机中的空闲内存量                //执行时间也是无法知道，因为dos执行java命令，程序无法知道它到底执行到那里了，两个进程，互不了解                long startCurrentTime = System.currentTimeMillis();//获取系统当前时间                method.invoke(null, new Object[]{
    null});                long endCurrentTime = System.currentTimeMillis();                long endFreeMemory = runtime.freeMemory();                //内存的使用情况，不是很精确                useMemory = (startFreeMemory-endFreeMemory)/1024.0;                if(useMemory > limitMemory) throw new Exception("Out Limit Memory!");                useTime = endCurrentTime-startCurrentTime;                if(useTime > limitTime) throw new Exception("Time Limited!");                                //获得控制台的输出                br = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(bao.toByteArray())));                String outc = null;                while((outc = br.readLine()) != null)                    outMsg.append(outc).append("\n");                //正常编译并运行                isCompileAndRunOK = true;            } else {                isCompilerError = true;                //打印编译的错误信息                Pattern p = Pattern.compile("Main.java\\D*(\\d+):", Pattern.DOTALL);                for (Diagnostic
         oDiagnostic : oDiagnosticCollector.getDiagnostics()){                    /*信息示例：                      Compiler Error: Main.java:8: 找不到符号                         符号： 类 Scanner                                位置： 类 Main                    */                    //将行号减1                    Matcher m = p.matcher("Compiler Error: " + oDiagnostic.getMessage(null));                    if(m.find()) {                        ce.append(m.replaceAll("Main.java " + String.valueOf(Integer.valueOf(m.group(1))-1)) + ":").append("\n");                    } else {                        ce.append("Compiler Error: " + oDiagnostic.getMessage(null)).append("\n");                    }                }            }                    } catch (Exception e) {            isRunningError = true;            StringWriter sw = new StringWriter();            e.printStackTrace(new PrintWriter(sw, true));            Pattern p = Pattern.compile("Main.java\\D*(\\d+)", Pattern.DOTALL);            Matcher m = p.matcher(sw.toString());            if(m.find()){                error = m.replaceAll("Main.java " + String.valueOf(Integer.valueOf(m.group(1))-1) + ":");            } else {                error = sw.toString();            }        } finally {            //关闭流            try {                if(fis != null)                    fis.close();                if(ps != null)                    ps.close();                    if(br != null)                    br.close();            } catch (IOException e) {                e.printStackTrace();            }            //恢复输入输出流            System.setIn(stdIn);            System.setOut(stdOut);        }    }        private class StringSourceJavaObject extends SimpleJavaFileObject {        private String content = null;        public StringSourceJavaObject(String name, String content) {            super(URI.create(name.replace('.', '/') + Kind.SOURCE.extension), Kind.SOURCE);            this.content = content;        }        public CharSequence getCharContent(boolean ignoreEncodingErrors) {            return content;        }    }}
       
      

public class Main {    public static void fun(){        fun();    }    public static void main(String[] args) {        Scanner scan = new Scanner(System.in);        int n = scan.nextInt();        int[] array = new int[n];        for(int i=0; i