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java遠(yuǎn)程調(diào)用python腳本講解 java執(zhí)行python代碼

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java遠(yuǎn)程調(diào)用python腳本講解 java執(zhí)行python代碼

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1. 問(wèn)題描述Java平臺(tái)要調(diào)用Pyhon平臺(tái)已有的算法 ， 為了減少耦合度 ， 采用Pyhon平臺(tái)提供Restful 接口 ， Java平臺(tái)負(fù)責(zé)來(lái)調(diào)用 ， 采用Http+Json格式交互 。
2. 解決方案2.1 JAVA平臺(tái)側(cè)2.1.1 項(xiàng)目代碼public static String invokeAlgorithm(String url, HashMap params) throws Exception {HttpHeaders headers = new HttpHeaders();headers.setContentType(MediaType.parseMediaType("application/json; charset=UTF-8"));headers.add("Accept", MediaType.APPLICATION_JSON.toString());HttpEntity<String> httpEntity = new HttpEntity<>(JSONObject.toJSONString(params), headers);RestTemplate rst = new RestTemplate();ResponseEntity<String> stringResponseEntity = rst.postForEntity(url, httpEntity, String.class);return stringResponseEntity.getBody();}2.1.2 代碼解析兩個(gè)入?yún)ⅲ簎rl為Python提供restful調(diào)用方法；params參數(shù) ， 項(xiàng)目中參數(shù)使用了map ， 然后將map轉(zhuǎn)成了Json ， 與Python服務(wù)器約定Json格式傳輸 。
2.2 python平臺(tái)側(cè)經(jīng)過(guò)反復(fù)調(diào)研與深思熟慮的考慮后 ， 決定采用flask提供Rest接口 ，  flask 是一款非常流行的python web框架 ， 微框架、簡(jiǎn)潔 ， 社區(qū)活躍等 。（其實(shí)是因?yàn)榘惭b的Anaconda自帶了flask ， 一配置一啟動(dòng)好了 ， 就是這么巧）
2.2.1 項(xiàng)目代碼# -*- coding: utf-8 -*-from flask import Flask, request, send_from_directoryfrom k_means import execapp = Flask(__name__)import logging@app.route('/')def index():return "Hello, World!"# k-means算法@app.route('/getKmeansInfoByPost', methods=['POST'])def getKmeansInfoByPost():try:result = exec(request.get_json())except IndexError as e:logging.error(str(e))return 'exception:' + str(e)except KeyError as e:logging.error(str(e))return 'exception:' + str(e)except ValueError as e:logging.error(str(e))return 'exception:' + str(e)except Exception as e:logging.error(str(e))return 'exception:' + str(e)else:return result@app.route("/<path:filename>")def getImages(filename):return send_from_directory(dirpath, filename, as_attachment=True)if __name__ == '__main__':app.run(host="0.0.0.0", port=5000, debug=True)2.2.2 代碼解析代碼為真實(shí)項(xiàng)目示例 ， 去掉了一些配置而已 ， 示例中包含三個(gè)方法 ， 分別說(shuō)一下
（1）最基本Rest接口：helloword# -*- coding: utf-8 -*-from flask import Flaskapp = Flask(__name__)@app.route('/')def index():return "Hello, World!"if __name__ == '__main__':app.run(host="0.0.0.0", port=5000, debug=True)（2）調(diào)用其他python文件的Rest接口# -*- coding: utf-8 -*-from flask import Flask, requestfrom k_means import execapp = Flask(__name__)import logging# k-means算法@app.route('/getKmeansInfoByPost', methods=['POST'])def getKmeansInfoByPost():try:result = exec(request.get_json())except IndexError as e:logging.error(str(e))return 'exception:' + str(e)except KeyError as e:logging.error(str(e))return 'exception:' + str(e)except ValueError as e:logging.error(str(e))return 'exception:' + str(e)except Exception as e:logging.error(str(e))return 'exception:' + str(e)else:return resultif __name__ == '__main__':app.run(host="0.0.0.0", port=5000, debug=True)說(shuō)明：1.接收POST方法；2. 從request獲取java傳過(guò)來(lái)的參數(shù) ， 對(duì)應(yīng)上面的java調(diào)用代碼
（3） 文件下載Rest接口# -*- coding: utf-8 -*-from flask import Flask, send_from_directoryapp = Flask(__name__)@app.route("/<path:filename>")def getImages(filename):return send_from_directory(dirpath, filename, as_attachment=True)if __name__ == '__main__':app.run(host="0.0.0.0", port=5000, debug=True)說(shuō)明：1.還是flask框架提供的：send_from_directory
2.dirpath目錄 ， 一般可以給個(gè)固定存放目錄 ， 調(diào)用的時(shí)候只用給文件名稱就可以直接下載對(duì)應(yīng)文件 。


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