记一次OJ在线代码编辑器（代码编译+运行，C、C++、Java）

如何在SpringBoot+Vue的项目中实现在线代码编译及执行（支持编译运行C、C++、Java），研究了一天，真实能用，下面直接上源码！！！

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一、后端（直接接收字符串进行代码编译）

（1）C编译执行方法（直接调用，传入字符串即可完成编译）

package complier.complier_c;import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;import complier.util.FileUtil;/*** C编译器* @author tpw**/
public class CComplier {private final static String CplusplusFILEPATH=System.getProperty("user.dir") + "\\cCode\\";private final static String CplusplusFILENAME="main.c";private final static String CplusplusEXE="main.exe";private String inputData; //输入数据private String outputData; //输出数据private String errorMsg; //程序错误信息public CComplier() {this.inputData="";this.errorMsg="";}public CComplier(String inputData) {super();this.inputData = inputData;this.errorMsg="";}public CComplier(String inputData, String outputData, String errorMsg) {super();this.inputData = inputData;this.outputData = outputData;this.errorMsg = errorMsg;}public void complier() {// 这里调用执行写入工具类，其他两个好像没写，这里给出个demoFileUtil.writeFile(inputData,CplusplusFILEPATH+CplusplusFILENAME);// 进入c代码存放文件夹// 使用gcc命令来编译c文件,来生成一个exe文件// 直接运行exe文件// cmd命令：cd /d d:\javaworkspace\complier\cCode// cmd命令：gcc main.cpp// cmd命令：main.exeStringBuffer errorInfo = new StringBuffer();Process p=null;try {//1.编译C++文件p = Runtime.getRuntime().exec("gcc "+CplusplusFILEPATH+CplusplusFILENAME+" -o "+CplusplusFILEPATH+"main");// 获取进程的错误流final InputStream is1 = p.getErrorStream();// 开一个线程,读标准错误流new Thread() {public void run() {try {BufferedReader br1 = new BufferedReader(new InputStreamReader(is1,Charset.forName("GBK")));String line1 = null;while ((line1 = br1.readLine()) != null) {if (line1 != null) {errorInfo.append(line1 + "\n");}}if(!errorInfo.toString().equals("")) {errorMsg=errorInfo.toString();}} catch (IOException e) {e.printStackTrace();} finally {try {is1.close();} catch (IOException e) {e.printStackTrace();}}}}.start();p.waitFor();p.destroy();//2.如果没错的话就运行exe文件if (errorInfo.toString().equals("")) {try {Process process = Runtime.getRuntime().exec(CplusplusFILEPATH+CplusplusEXE);BufferedWriter bout = new BufferedWriter(new OutputStreamWriter(process.getOutputStream()));bout.write(this.inputData);bout.close();BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream(),Charset.forName("GBK")));String line = null;StringBuffer b = new StringBuffer();while ((line = br.readLine()) != null) {b.append(line + "\n");}this.outputData=b.toString();} catch (IOException e) {e.printStackTrace();}}} catch (Exception e) {try {p.getErrorStream().close();p.getInputStream().close();p.getOutputStream().close();} catch (Exception ee) {ee.printStackTrace();}}}public String getInputData() {return inputData;}public void setInputData(String inputData) {this.inputData = inputData;}public String getOutputData() {return outputData;}public void setOutputData(String outputData) {this.outputData = outputData;}public String getErrorMsg() {return errorMsg;}public void setErrorMsg(String errorMsg) {this.errorMsg = errorMsg;}
}

（2）C++编译执行方法（直接调用，传入字符串即可完成编译）

package complier.complier_cplusplus;import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;/*** C++编译器* @author tpw**/
public class CplusplusComplier {private final static String CplusplusFILEPATH=System.getProperty("user.dir") + "\\c++Code\\";private final static String CplusplusFILENAME="main.cpp";private final static String CplusplusEXE="main.exe";private String inputData; //输入数据private String outputData; //输出数据private String errorMsg; //程序错误信息public CplusplusComplier() {this.inputData="";this.errorMsg="";}public CplusplusComplier(String inputData) {super();this.inputData = inputData;this.errorMsg="";}public CplusplusComplier(String inputData, String outputData, String errorMsg) {super();this.inputData = inputData;this.outputData = outputData;this.errorMsg = errorMsg;}public void complier() {// 进入c++代码存放文件夹// 使用g++命令来编译c++文件,来生成一个exe文件// 直接运行exe文件// cmd命令：cd /d d:\javaworkspace\complier\c++Code// cmd命令：g++ main.cpp// cmd命令：main.exeStringBuffer errorInfo = new StringBuffer();Process p=null;try {//1.编译C++文件p = Runtime.getRuntime().exec("g++ "+CplusplusFILEPATH+CplusplusFILENAME+" -o "+CplusplusFILEPATH+"main");// 获取进程的错误流final InputStream is1 = p.getErrorStream();// 开一个线程,读标准错误流new Thread() {public void run() {try {BufferedReader br1 = new BufferedReader(new InputStreamReader(is1,Charset.forName("GBK")));String line1 = null;while ((line1 = br1.readLine()) != null) {if (line1 != null) {errorInfo.append(line1 + "\n");}}if(!errorInfo.toString().equals("")) {errorMsg=errorInfo.toString();}} catch (IOException e) {e.printStackTrace();} finally {try {is1.close();} catch (IOException e) {e.printStackTrace();}}}}.start();p.waitFor();p.destroy();//2.如果没错的话就运行exe文件if (errorInfo.toString().equals("")) {try {Process process = Runtime.getRuntime().exec(CplusplusFILEPATH+CplusplusEXE);BufferedWriter bout = new BufferedWriter(new OutputStreamWriter(process.getOutputStream()));bout.write(this.inputData);bout.close();BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream(),Charset.forName("GBK")));String line = null;StringBuffer b = new StringBuffer();while ((line = br.readLine()) != null) {b.append(line + "\n");}this.outputData=b.toString();} catch (IOException e) {e.printStackTrace();}}} catch (Exception e) {try {p.getErrorStream().close();p.getInputStream().close();p.getOutputStream().close();} catch (Exception ee) {ee.printStackTrace();}}}public String getInputData() {return inputData;}public void setInputData(String inputData) {this.inputData = inputData;}public String getOutputData() {return outputData;}public void setOutputData(String outputData) {this.outputData = outputData;}public String getErrorMsg() {return errorMsg;}public void setErrorMsg(String errorMsg) {this.errorMsg = errorMsg;}
}

（3）Java编译执行方法（直接调用，传入字符串即可完成编译）

package complier.complier_java;import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;/*** java编译器* @author tpw**/
public class JavaComplier {private final static String jAVAFILEPATH=System.getProperty("user.dir") + "\\javaCode";private final static String JAVAFILENAME="Main.java";private final static String jAVAFILECLASNAME="Main";private String inputData; //输入数据private String outputData; //输出数据private String errorMsg; //程序错误信息public JavaComplier() {this.inputData="";this.errorMsg="";}public JavaComplier(String inputData) {super();this.inputData = inputData;this.errorMsg="";}public JavaComplier(String inputData, String outputData, String errorMsg) {super();this.inputData = inputData;this.outputData = outputData;this.errorMsg = errorMsg;}public void complier() {// 进入java代码存放文件夹// 使用javac命令来编译java文件,来生成一个class文件// 使用java命令来运行类// cmd命令：cd /d d:\javaworkspace\complier\javaCode// cmd命令：javac Main.java// cmd命令：java MainStringBuffer errorInfo = new StringBuffer();Process p=null;try {//1.编译java文件p = Runtime.getRuntime().exec("javac "+JAVAFILENAME, null, new File(jAVAFILEPATH));// 获取进程的错误流final InputStream is1 = p.getErrorStream();// 开一个线程,读标准错误流new Thread() {public void run() {try {BufferedReader br1 = new BufferedReader(new InputStreamReader(is1,Charset.forName("GBK")));String line1 = null;while ((line1 = br1.readLine()) != null) {if (line1 != null) {errorInfo.append(line1 + "\n");}}if(!errorInfo.toString().equals("")) {errorMsg=errorInfo.toString();}} catch (IOException e) {e.printStackTrace();} finally {try {is1.close();} catch (IOException e) {e.printStackTrace();}}}}.start();p.waitFor();p.destroy();//2.如果没错的话就运行java文件if (errorInfo.toString().equals("")) {try {Process process = Runtime.getRuntime().exec("java "+jAVAFILECLASNAME, null, new File(jAVAFILEPATH));BufferedWriter bout = new BufferedWriter(new OutputStreamWriter(process.getOutputStream()));bout.write(this.inputData);bout.close();BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream(),Charset.forName("GBK")));String line = null;StringBuffer b = new StringBuffer();while ((line = br.readLine()) != null) {b.append(line + "\n");}this.outputData=b.toString();} catch (IOException e) {e.printStackTrace();}}} catch (Exception e) {try {p.getErrorStream().close();p.getInputStream().close();p.getOutputStream().close();} catch (Exception ee) {ee.printStackTrace();}}}public String getInputData() {return inputData;}public void setInputData(String inputData) {this.inputData = inputData;}public String getOutputData() {return outputData;}public void setOutputData(String outputData) {this.outputData = outputData;}public String getErrorMsg() {return errorMsg;}public void setErrorMsg(String errorMsg) {this.errorMsg = errorMsg;}
}

（4）字符串写入工具类（直接调用，传入字符串即可完成写入）

package complier.util;import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;public class FileUtil {public static void writeFile(String content,String filePath) {try {BufferedWriter out = new BufferedWriter(new FileWriter(filePath));out.write(content);out.close();} catch (IOException e) {e.printStackTrace();}    }
}

（5）测试调用Demo

package complier.complier_java;public class Test {public static void main(String[] args) {// 这里调用的Java编译，其他类同JavaComplier javaComplier=new JavaComplier("Hello!!");javaComplier.complier();String proError=javaComplier.getErrorMsg();if(!proError.equals("")) {System.err.println(proError);}else {System.out.println(javaComplier.getOutputData());}}
}

二、前端（输入字符串，简单的直接输入框，复杂点就用ACE插件或者其他，此案例使用的ACE）

js引入方式可以采取以下方式，推荐本地下载包引入：

        在线js引入举例（这两个是可以用的）：     

        本地js引入举例：     

效果截图 ：

三、编译执行代码还需要在项目的src同级目录下创建对应的编译文件夹，用于接收字符串写入并执行。下面放出目录截图，直接用记事本创建并更改扩展名即可，文件里面的内容都是空的。

四、此项目总体截图

输入代码（C）：

代码执行结果：

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