常见的java调用python脚本方式有两种,下面给大家介绍一下:
·通过Jython.jar提供的类库实现
·通过Runtime.getRuntime()开启进程来执行脚本文件
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这两种方法我都尝试过,个人推荐第二种方法,因为Python有时需要用到第三方库,比如requests,而Jython不支持。所以本地安装Python环境并且安装第三库再用Java调用是最好的方法。
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下面通过两个小例子,分别是不带参数和带参数的,展示如何使用Java调用Python脚本:
Python代码:
def hello(): print('Hello,Python') if __name__ == '__main__': hello()
Java代码:
import java.io.BufferedReader; import java.io.InputStreamReader; public class HelloPython { public static void main(String[] args) { String[] arguments = new String[] {"python", "E://workspace/hello.py"}; try { Process process = Runtime.getRuntime().exec(arguments); BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream(), "GBK")); String line = null; while ((line = in.readLine()) != null) { System.out.println(line); } in.close(); //java代码中的process.waitFor()返回值为0表示我们调用python脚本成功, //返回值为1表示调用python脚本失败,这和我们通常意义上见到的0与1定义正好相反 int re = process.waitFor(); System.out.println(re); } catch (Exception e) { e.printStackTrace(); } } }
其中说明一点,BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream(),"GBK"));这段代码中的GBK是为了防止Python输出中文时乱码加的。
运行结果:
接下来是带参数的,Python代码:
import sys def hello(name,age): print('name:'+name) print('age:'+age) if __name__ == '__main__': hello(sys.argv[1], sys.argv[2])
Java代码:
import java.io.BufferedReader; import java.io.InputStreamReader; public class HelloPython { public static void main(String[] args) { String[] arguments = new String[] {"python", "E://workspace/hello.py","lei","23"}; try { Process process = Runtime.getRuntime().exec(arguments); BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream(), "GBK")); String line = null; while ((line = in.readLine()) != null) { System.out.println(line); } in.close(); //java代码中的process.waitFor()返回值为0表示我们调用python脚本成功, //返回值为1表示调用python脚本失败,这和我们通常意义上见到的0与1定义正好相反 int re = process.waitFor(); System.out.println(re); } catch (Exception e) { e.printStackTrace(); } } }
运行结果: