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你还在纠结怎么样在Java中调用python吗?我们在实际工程项目问题中,经常会碰到不同语言代码之间互调的问题,比如此处的Java调用Python(常见Java调用python写的处理模型来完成数据处
你还在纠结怎么样在Java中调用python吗?我们在实际工程项目问题中,经常会碰到不同语言代码之间互调的问题,比如此处的Java调用Python(常见Java调用python写的处理模型来完成数据处理等)。
说明: Java调用不带参数的python代码执行
样例代码如下:
try {String exe = "python解释器所处的绝对路径";String py = "python代码文件绝对地址";Process process = Runtime.getRuntime().exec(exe + " " + py);//获取结果的同时设置输入流编码格式"gb2312"InputStreamReader isr = new InputStreamReader(process.getInputStream(),"gb2312");LineNumberReader input = new LineNumberReader(isr);String result = "";result = input.readLine();System.out.println(result);input.close();isr.close();process.waitFor();} catch (InterruptedException | IOException e) {System.out.println("调用python脚本并读取结果时出错:" + e.getMessage());}
带参调用可以将命令和参数写入String数组,然后作为执行参数执行。
基本语句如下:
String exe = "python解释器所处的绝对路径";String py = "python代码文件绝对地址";String pram = "单个传递参数,若参数为基本类型,转化为String;若为数组等类型,也是将其转换为String型";String [] args = new String[] {exe, py, pram...};Process process = Runtime.getRuntime().exec(args);
说明: Java调用不带参数的python代码执行
样例代码如下:
try {String exe = "python解释器所处的绝对路径";String py = "python代码文件绝对地址";String pram = "单个传递参数,若参数为基本类型,转化为String;若为数组等类型,也是将其转换为String型";String [] args = new String[] {exe, py, pram...};Process process = Runtime.getRuntime().exec(args);//获取结果的同时设置输入流编码格式"gb2312"InputStreamReader isr = new InputStreamReader(process.getInputStream(),"gb2312");LineNumberReader input = new LineNumberReader(isr);String result = "";result = input.readLine();System.out.println(result);input.close();isr.close();process.waitFor();} catch (InterruptedException | IOException e) {System.out.println("调用python脚本并读取结果时出错:" + e.getMessage());}
说明: Java调用不带参数的python代码执行
样例代码如下:
try {String exe = "python解释器所处的绝对路径";String py = "python代码文件绝对地址";String pram = "单个传递参数,若参数为基本类型,转化为String;若为数组等类型,也是将其转换为String型";String [] args = new String[] {exe, py, pram...};ProcessBuilder builder = new ProcessBuilder(args); Process process = builder.start(); BufferedReader success = new BufferedReader(new InputStreamReader(process.getInputStream(), "GB2312"));//获取字符输入流对象 BufferedReader error = new BufferedReader(new InputStreamReader(process.getErrorStream(), "GB2312"));//获取错误信息的字符输入流对象 String line = null; List<String> success_result = new ArrayList<>(); List<String> error_result = new ArrayList<>(); //记录输出结果 while ((line = success.readLine()) != null) { success_result.add(line); } //记录错误信息 while ((line = error.readLine()) != null) { error_result.add(line); } success.close(); error.close(); process.waitFor(); System.out.println(success_result); System.out.println(error_result);} catch (InterruptedException | IOException e) {System.out.println("调用python脚本并读取结果时出错:" + e.getMessage());}
注意: 此方法在使用之前需要导入依赖环境,如在Maven中导入如下依赖:
<dependency> <groupId>org.pythongroupId> <artifactId>jython-standaloneartifactId> <version>3.7.0version>dependency>
调用语句如下:
import org.python.util.PythonInterpreterpublic class JavaRunPython { public static void main(String[] args) { //调用python的解释器 PythonInterpreter interpreter = new PythonInterpreter(); //执行Python语句 interpreter.exec("str = 'hello world!'; "); interpreter.exec("print(str);"); }}
注意: 此方法也需要导入1.3中依赖
Java调用代码如下:
import org.python.util.PythonInterpreter;public class JavaPythonFile { public static void main(String[] args) { PythonInterpreter interpreter = new PythonInterpreter(); //我在这里使用相对路径,注意区分 interpreter.execfile("D:/code/test.py"); }}
test.py举例如下:
a = 1b = 2print(a +b)
hello.bat测试代码如下:
echo hello world!D:cd D:\code\start python test.pypause
Java调用代码如下:
try {StringBuilder sb = new StringBuilder();String batPath = "D:/hello.bat";Process process = Runtime.getRuntime().exec(batPath);InputStream in = process.getInputStream();BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in));String line;while ((line = bufferedReader.readLine()) != null) {sb.append(line + "\n");}in.close();try {process.waitFor();} catch (InterruptedException e) {System.out.println(e);}} catch (IOException e) {System.out.println(e);}
如果大家有好的方法,欢迎交流评论!
来源地址:https://blog.csdn.net/qq_43522889/article/details/126776656
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本文标题: Java调用python代码的五种方式
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