python调用Java方法传入HashMap ArrayList

1、Java代码：

package com;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

public class ListTest {
    public ListTest(){}

    public ArrayList<Double> sumList(ArrayList<Double> arrayList){
        double sum = 0.0;
        for (Double num :arrayList){
            sum += num;
        }
        ArrayList<Double> doubles = new ArrayList<Double>();
        doubles.add(sum);
        return doubles;
    }

    public HashMap<String,Integer> countWrod(String str){
        String[] st = str.split(" ");
        HashMap<String,Integer> map = new HashMap<>();
        for (String strs:st){
            if (map.containsKey(strs)){
                map.put(strs,map.get(strs)+1);
            }else{
                map.put(strs,1);
            }
        }
        return map;
    }

    public ArrayList<HashMap<String,Double>> listMap(ArrayList<HashMap<String,Double>> lm){
        return new ArrayList<>(lm);
    }

    public static void main(String[] args){
        ListTest t = new ListTest();
        Double[] als = {1.0,2.0,3.0};
        ArrayList s = t.sumList(new ArrayList<Double>(Arrays.asList(als)));
        System.out.println(s);

        ArrayList<HashMap<String,Double>> lt = new ArrayList<HashMap<String,Double>>();
        HashMap<String,Double>  md = new HashMap<>();
        md.put("我的",25.);
        lt.add(md);
        System.out.println(t.listMap(lt));

        String st = "wo is are you do wo is you get set add al al als al";
        System.out.println(t.countWrod(st));
    }
}

　　

2、封装成jar包请看上一篇博文

　　https://www.cnblogs.com/wuzaipei/p/11161247.html

3、python代码

import time

from jpype import *
import os
import numpy as np
import json

if __name__ == '__main__':
    jdkPath = r"D:\Java1.8\jdk1.8.0_191\jre\bin\server\jvm.dll"

    #  注意一个重要的问题，导入包的时候路径不能有中文。
    jarpath = os.path.join(os.path.abspath('.'), 'javaCode/listMapTest.jar')
    print(jarpath)
    startJVM(jdkPath,"-ea","-Djava.class.path=%s" % jarpath)
    java.lang.System.out.println(" helloworld! ")
    model = JClass('com.ListTest')
    # 或者通过JPackage引用Test类
    # javaIoStream = JPackage('javaIoStream')
    # fibnq = javaIoStream.fibnq()
    ListTest= model()

    # 1、传入List
    al = [1,2,3,4,2,5]
    jl = java.util.ArrayList()
    for i in al:
        jl.add(float(i))
    ll = ListTest.sumList(jl).toString()

    # 2、接收Map
    str = "life is short we use python list is shor we use java"

    maps = ListTest.countWrod(str).toString()

    # 3、传入 list 嵌套map。
    lmst = [{"admin":float(2),"我不做大哥好多年":float(9.0)},{"我不做大哥好多年":float(9.0)},{"i love you":0.520}]

    listMaps = java.util.ArrayList()
    for item in lmst:
        mp = java.util.HashMap()
        for k in item.keys():
            mp.put(k,item.get(k))
        listMaps.add(mp)

    listM = ListTest.listMap(listMaps).toString()

    shutdownJVM()

    print(json.loads(ll)[0])

    stmp = ""
    for item in maps:
        if item == "=":
            stmp += ":"
        else:
            stmp += item
    print(stmp)

    print(listM)