Personally effective --- python calls jar

# - * - Coding: UTF-8 - - * 
Import JPype 
from JPype Import * 
Import os.path 

( '.') jarpath = os.path.abspath 
# This function is used to get the absolute path of the current python script where 
aa = jarpath + '\ JpypeDemo.jar' 
Print (AA) 
jvm_path jpype.getDefaultJVMPath = () # Get the current path of the system JDK 
Print (jvm_path) 
# startJVM ( "/ usr / local / Java / jdk1.8.0_181 / JRE / lib / AMD64 /server/libjvm.so","-ea","-Djava.class.path=%s "% (+ jarpath '/JpypeDemo.jar'))           
# # this startJVM function role is to load the Java virtual machine, its a parameter must be the installation location of your Java jdk, everyone is not the same installation location, 
# my address is bold above that period (Note !!! some say the tutorials directly through getDefaultJVMPath () function get Java address 
# is not recommended! not recommended! not recommended! because the address of this function is likely to be obtained computer comes with oracle version of Java, 
# is not our own Java installed, this problem due to environmental variables It will lead to error);! paraphrase the second argument is unknown, anyway, plus on the right; 
# The third parameter is where you packaged jar package absolute path, I can see the path to the current directory and JpypeDemo.jar previously been combined. 
jpype.startJVM (jvm_path, "- EA", "- Djava.class.path% S ="% AA) 
JDClass JClass = ( "demo1.JpypeDemo") a Java application # class (magic ~) 

JD = JDClass 
Jprint = Java .lang.System.out.println # Java application output function output class 
jprint (jd.sayHello ( "waw") ) # call the class's sayHello function, and print output function with Java Java return value 
jprint (str (jd. calc (2,4))) # call the class of summing function, and print output function with Java Java return value to be printed as a character type of the value of 

# close the Java virtual machine, you can write from time to write, do not write in the program will be automatically shut down at the end of 
shutdownJVM ()