我从此链接阅读了 JPype 文档:http://jpype.readthedocs.io/en/latest/ ,但我不确定我是否可以使用 JPype,或者最好选择另一种方式从 python3 运行 java 类。我还必须指出,我对使用 JPype 感到有点困惑。 我这样做了:
import urllib.request
import os
import tempfile
import sys
import fileinput
import logging
import JPype as jp
# here i have python code and do something else
"""
my python code
"""
#from this point till end of the code i did for my question
logging.basicConfig(filename="ERROR.txt", level= logging.ERROR)
try:
logging.debug('we are in the main try loop')
jp.startJVM("C:/Users/user/AppData/Local/Programs/Python/Python36/ClassWithTest.java", "-ea")
test_class = jp.JClass("ClassWithTest")
a = testAll()
file_java_class = open("OUTPUT.txt", "w")
file_java_class.write(a)
except Exception as e1:
logging.error(str(e1))
jp.shutdownJVM()
- 但它有问题并向我显示此错误:7,导入中 jpype as jp ModuleNotFoundError:没有名为“jpype”的模块
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- 我必须指出我的 java 类位于我的 python 路径和我的 java 中 类(class)是:
<小时/>public class ClassWithTest{ public ClassWithTest(){ /* Va invocato */ System.out.println(insertLength("Tests ready to run")); } public void testAbs(){ /* Va invocato */ System.out.println(insertLength("Invocation of " + Thread.currentThread().getStackTrace()[1].getMethodName())); System.out.println(insertLength("abs(-2) = 2: " + testResult(Math.abs(-2), 2))); System.out.println(insertLength("abs(-3) = -2: " + testResult(Math.abs(-3), -2))); } public void testRound(){ /* Va invocato */ System.out.println(insertLength("Invocation of " + Thread.currentThread().getStackTrace()[1].getMethodName())); System.out.println(insertLength("round(0.7) = 1: " + testResult(Math.round(0.7), 1))); System.out.println(insertLength("round(0.2) = 1: " + testResult(Math.round(0.2), 1))); } public void testMin(){ /* Va invocato */ System.out.println(insertLength("Invocation of " + Thread.currentThread().getStackTrace()[1].getMethodName())); System.out.println(insertLength("min(7,3) = 3: " + testResult(Math.min(7,3), 3))); System.out.println(insertLength("min(5,7) = 7: " + testResult(Math.min(5,7), 7))); } public void testMax(){ /* Va invocato */ System.out.println(insertLength("Invocation of " + Thread.currentThread().getStackTrace()[1].getMethodName())); System.out.println(insertLength("max(7,14) = 14: " + testResult(Math.max(7,14), 14))); System.out.println(insertLength("max(5,7) = 5: " + testResult(Math.max(5,7), 5))); } public void TestDiv(){ /* Non andreabbe chiamato */ System.out.println(insertLength("Invocation of " + Thread.currentThread().getStackTrace()[1].getMethodName())); System.out.println(insertLength("14 / 2 = 7: " + testResult(14 / 7, 3))); // assert(14 / 0 == 10)); } public void testMult(int x){ /* Non andreabbe chiamato */ System.out.println(insertLength("Invocation of " + Thread.currentThread().getStackTrace()[1].getMethodName())); System.out.printf("2 * %d = %s:", x, testResult(2 * x, 2 * x))); // assert(false)); } public void otherTest(){ /* Non andreabbe chiamato */ System.out.println(insertLength("Invocation of " + Thread.currentThread().getStackTrace()[1].getMethodName())); System.out.printf("1 = 1:", testResult(1, 1))); // assert(false)); } private void testAll(){ /* Non dovrebbe essere chiamato */ System.out.println(insertLength("Invocation of " + Thread.currentThread().getStackTrace()[1].getMethodName())); testAbs()); testRound()); testMin()); testMax()); } private static String testResult(double result, double expected){ return (result == expected ? "ok" : "no")); } public static String insertLength(Object obj){ String line = obj.toString()); return String.format("[%d]> %s", line.length(), line)); } public static void main(String[] args){ (new ClassWithTest()).testAll()); } }
- 我不知道为什么这不起作用?!!我读了 jython,但我不能使用 jython,因为我不太理解。你能帮我吗:
- 1-我如何从 python 运行 java 类 2-保存输出 在文本文件 3 中执行 - 将可能的错误消息保存在 另一个文本文件,然后终止。谢谢你
最佳答案
我通常使用 JYthon。在 Jython 应用程序中使用 Java 与在 Jython 脚本中使用外部 Jython 模块一样无缝。
这是一个简单的例子:
from java.lang import Math
Math.max(4, 7)
Math.pow(10,5)
from java.lang import System as javasystem
javasystem.out.println("Hello")
Hello
关于java - Python3 : how to run java class file from python,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48227571/