用超简单的python代码实现Java在线编译器

超、凢脫俗 2022-06-13 06:16 493阅读 0赞

原理参照[python在线编译器实现][python]

代码注释很多，直接上代码

目录结构：

OnlineEXEC

|----zxby.py

|----test.bat(因为测试环境是windows，linux可以自行改成shell)

|----app

|----flaskrun.py

zxby.py代码实现：

# -*- coding: utf-8 -*-
    #__author__="ZJL"
    
    import os,subprocess,tempfile
    
    
    # 创建临时文件夹,返回临时文件夹路径
    TempFile = tempfile.mkdtemp(suffix='_test', prefix='java_')
    # javac 和 Java 编译器位置
    JAVAC_EXEC = "C:\java\jdk1.8.0_121\\bin\javac"
    JAVA_EXEC = "C:\java\jdk1.8.0_121\\bin\java"
    
    
    # 获得java文件名
    def get_javaname(code):
        if code:
            if "public class" in code and "{" in code:
                FileName = code.split("public class ")[1].split("{")[0].strip()
            else:
                FileName = "test"
            return FileName
    
    # 接收代码写入文件
    def write_file(jname, code):
        fpath = os.path.join(TempFile, '%s.java' % jname)
        with open(fpath, 'w', encoding='utf-8') as f:
            f.write(code)
        print('file path: %s' % fpath)
        return fpath
    
    # 编码
    def decode(s):
        try:
            return s.decode('utf-8')
        except UnicodeDecodeError:
            return s.decode('gbk')
    
    # 主执行函数
    def main(code):
        r = dict()
        jname = get_javaname(code)
        fpath = write_file(jname, code)
        try:
            # subprocess.check_output 是 父进程等待子进程完成，返回子进程向标准输出的输出结果
            # stderr是标准输出的类型
            # 编译Java代码
            outdata = decode(subprocess.check_output([JAVAC_EXEC, fpath], stderr=subprocess.STDOUT, timeout=5))
        except subprocess.CalledProcessError as e:
            # e.output是错误信息标准输出
            # 错误返回的数据
            r["code"] = 'Error'
            r["output"] = decode(e.output)
            return r
        else:
            # 执行Java代码
            # 因为调用原因，bat写绝对路径
            outdata = decode(subprocess.check_output(["D:\\PycharmProjects\\zxbyqjava\\test.bat", TempFile,JAVA_EXEC,jname], stderr=subprocess.STDOUT, timeout=5))
            # 成功返回的数据
            r['output'] = outdata
            r["code"]="Success"
            return r
    
    # if __name__ == '__main__':
    #     code ="""public class hello {public static void main(String []args) {System.out.println("Hello World");}}"""
    #     print(main(code))

test.bat代码实现(这个脚本的作用是解决classpath路径执行的问题):

@echo off
    
    C:
    cd %1
    %2 %3

flaskrun.py代码实现：

# -*- coding: utf-8 -*-
    #__author__="ZJL"
    
    from flask import Flask
    from flask import request
    from flask import Response
    import json
    import zxby
    
    app = Flask(__name__)
    
    def Response_headers(content):
        resp = Response(content)
        resp.headers['Access-Control-Allow-Origin'] = '*'
        return resp
    
    @app.route('/')
    def hello_world():
        return Response_headers('hello world!!!')
    
    @app.route('/run',methods=['POST'])
    def run():
        if request.method == 'POST' and request.form['code']:
            code = request.form['code']
            jsondata = zxby.main(code)
            return Response_headers(str(jsondata))
    
    @app.errorhandler(403)
    def page_not_found(error):
        content = json.dumps({"error_code": "403"})
        resp = Response_headers(content)
        return resp
    
    @app.errorhandler(404)
    def page_not_found(error):
        content = json.dumps({"error_code": "404"})
        resp = Response_headers(content)
        return resp
    
    @app.errorhandler(400)
    def page_not_found(error):
        content = json.dumps({"error_code": "400"})
        resp = Response_headers(content)
        return resp
    
    @app.errorhandler(405)
    def page_not_found(error):
        content = json.dumps({"error_code": "405"})
        resp = Response_headers(content)
        return resp
    
    @app.errorhandler(410)
    def page_not_found(error):
        content = json.dumps({"error_code": "410"})
        resp = Response_headers(content)
        return resp
    
    @app.errorhandler(500)
    def page_not_found(error):
        content = json.dumps({"error_code": "500"})
        resp = Response_headers(content)
        return resp
    
    if __name__ == '__main__':
        app.run(debug=True)

打开postman测试：

成功测试：

![Center][]

错误测试;

![Center 1][]

[python]: http://blog.csdn.net/u013055678/article/details/73896477
[Center]: /images/20220613/acc4340b17534ad9a024636fa2b5a6f3.png
[Center 1]: /images/20220613/6e5765b5757d473aad900959f8eb50e4.png