Home>Article>Backend Development> How to adjust the python interface in the java backend

How to adjust the python interface in the java backend

(*-*)浩
(*-*)浩 Original
2019-07-01 09:42:04 5438browse

最近在做项目的时候,需要java 调用 python 接口,在网上找了一些方法,但是总碰到一些问题,索性将网上的方法和自己的理解总结一下,希望对各位有所帮助,也请各位大神不吝赐教。

How to adjust the python interface in the java backend

此方法需要引用 org.python包,需要下载Jpython。在这里先介绍一下Jpython。下面引入百科的解释:(推荐学习:Python视频教程

Jython是一种完整的语言,而不是一个Java翻译器或仅仅是一个Python编译器,它是一个Python语言在Java中的完全实现。Jython也有很多从CPython中继承的模块库。最有趣的事情是Jython不像CPython或其他任何高级语言,它提供了对其实现语言的一切存取。所以Jython不仅给你提供了Python的库,同时也提供了所有的Java类。这使其有一个巨大的资源库。

一:创建环境 Python 环境

import org.python.util.PythonInterpreter; import java.util.Properties; /** * Jython环境,获取Python的实例 * @author webim * */ public class JythonEnvironment { //定义一个静态变量 private static JythonEnvironment INSTANCE = new JythonEnvironment(); /** * 私有构造方法 */ private JythonEnvironment() { } /** * 获取单例 * @return JythonEnvironment */ public static JythonEnvironment getInstance() { return INSTANCE; } /** * 获取python解释器 * @return PythonInterpreter */ public PythonInterpreter getPythonInterpreter() { Properties props = new Properties(); props.put("python.home","path to the Lib folder"); props.put("python.console.encoding", "UTF-8"); // Used to prevent: console: Failed to install '': java.nio.charset.UnsupportedCharsetException: cp0. props.put("python.security.respectJavaAccessibility", "false"); //don't respect java accessibility, so that we can access protected members on subclasses props.put("python.import.site","false"); Properties preprops = System.getProperties(); //对 python 进行初始化 PythonInterpreter.initialize(preprops, props, new String[0]); PythonInterpreter inter = new PythonInterpreter(); return inter; } }

二:调用 python 的接口

因为 python 和 java是两种不同的语言,因此在项目的 controller 、service 和 mapper 中直接出现 Python 的接口,因此自己封装ExecPython 类,
封装python的接口,目的让 python 接口和java程序分隔开。

import org.python.core.PyFunction; import org.python.core.PyObject; import org.python.util.PythonInterpreter; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; import org.springframework.stereotype.Service; import java.util.Map; /*enum的这个用法,可以作为变种的安全单例,值得借鉴哦 ^_^ */ @Service @Component public class ExecPython { public static final Logger logger = LoggerFactory.getLogger(Exception.class); //定义 python 解释器 private static PythonInterpreter inter; public ExecPython() { this.inter = JythonEnvironment.getInstance().getPythonInterpreter(); this.inter.execfile("C:\\test.py"); } //设置 python 脚本的路径 public void setPythonPath (String pythonPath){ this.inter.execfile(pythonPath); } public void execute(String scriptFile, Map properties) { logger.info("获取解释器"); try { PyFunction getNetInfo = (PyFunction) inter.get("getNetInfo", PyFunction.class); PyObject netInfo = getNetInfo.__call__(); System.out.println("anwser = " + netInfo.toString()); } catch (Exception e) { e.printStackTrace(); logger.info("Python 脚本文件执行失败"); } } //获取 Python 字符串 public String getString(){ //获取到python 脚本中的接口 PyFunction func = (PyFunction) inter.get("adder", PyFunction.class); PyObject pyobj = func.__call__(); System.out.println("anwser = " + pyobj.toString()); return pyobj.toString(); } // 获取当前数组 public String getArr() { PyFunction getArr = (PyFunction) inter.get("getArr", PyFunction.class); PyObject pyobjTwo = getArr.__call__(); pyobjTwo.__len__(); System.out.println("anwser = " + pyobjTwo.toString()+" len:"+pyobjTwo.__len__()); //将 PyObject 对象转换成 java 对象 //Object object = pyobjTwo.__tojava__(List.class); //List list = (List) object; //将查询到数据转换成一个 JSON 字符串 String result = pyobjTwo.toString(); String JsonStr = "{" + result + "}"; logger.info(JsonStr); logger.info("将查询的结果转换成 JSON 字符串:",JsonStr); return pyobjTwo.toString(); } }

更多Python相关技术文章,请访问Python教程栏目进行学习!

The above is the detailed content of How to adjust the python interface in the java backend. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn