jython笔记

这篇笔记主要记录了我使用jython的一些问题点：

首先，jython是一个Java写的用来解析python语言的工具，他可以做到运行环境中没有python也可以使用python。

jython采用的方式是优先使用本机的python2，如果没有检测到本机的python2，则会去寻找jython.rar或者本机安装好的jython运行环境。

下面是我写的一些jython的代码：

PySource，因为jython启动之后需要关闭，而且启动一个实例的时间挺长的，所以最好是做成静态类：

package com.shinho.bi.db;

 import org.python.util.PythonInterpreter;

 public class PySource {

     public static PythonInterpreter inter;

     public static void init(){
         inter = new PythonInterpreter();
     }
}

jython使用方法，里面有入参和出参的传递：

/**
      * 特殊数据处理方法
      * @param key 模板关键字
      * @param list 查询出来的结果集
      * @throws TemplateException
      * @throws IOException
      */
     public static String MathMethod(String key, String json){
         Cache<String, Object> myCache = EhcacheUtil.cacheManager.getCache("myCache", String.class, Object.class);
         Map<String, String> tpls = (Map<String, String>)myCache.get("sqls");
         String res = "";
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd HH:mm:ss");
         String sqlModel = tpls.get(key);
         StringWriter out = null;
         try {
             PySource.inter.set("ds", json);
             out = new StringWriter();
             PySource.inter.setOut(out);
             logger.info("begin time:"+sdf.format(new Date()));
             PySource.inter.exec(sqlModel);
             //调试的时候取本地代码
             //PySource.inter.execfile("/home/wp/Code/SQLModel/python/daily.py");
             //调试的时候取本地代码
             logger.info("end time:"+sdf.format(new Date()));
             res = out.toString();
             logger.info(res);
         } catch (Exception e) {
             e.printStackTrace();
         }finally{
             try {
                 out.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }

         return res;
    }

python模板

#coding:utf-8

import sys
import json
import time
import calendar

if __name__ == '__main__':
    model = json.loads(ds)
    rdc1 = model[0]
    goal = model[1][0]
    ly = model[1][1]
    ny = time.strftime("%Y", time.localtime())
    nm = time.strftime("%m", time.localtime())
    nd = time.strftime("%d", time.localtime())
    nym = time.strftime("%Y%m", time.localtime())
    monthRange = calendar.monthrange(int(ny),int(nm))[1]
    dayNow = int(nd)
    avg_goal = float(goal['mapList'][0]['value'])/monthRange
    avg_ly = float(ly['mapList'][0]['value'])/monthRange
    rdcList = []
    goalList = []
    lyList = []
    vsGoal = []
    vsLy = []
    vsGoalLv = []
    vsLyLv = []
    i = 1
    nowBgt = 0
    nowLy = 0
    while (i <= monthRange):
        dd = str(i)
        if i < 10:
            dd = ''+str(i)
        nowBgt = nowBgt + avg_goal
        nowLy = nowLy + avg_ly
        goalMap = {'key': nym + dd, 'value': nowBgt}
        lyMap = {'key': nym + dd, 'value': nowLy}
        goalList.append(goalMap)
        lyList.append(lyMap)
        i = i+1
    goalCard = {'index': 'MRL2', 'mapList': goalList}
    lyCard = {'index': 'MRL3', 'mapList': lyList}
    nowVal = 0
    i = 1
    while (i <= dayNow):
        dd = str(i)
        if i < 10:
            dd = ''+str(i)
        if i-1 < len(rdc1[0]["mapList"]):
            key = rdc1[0]["mapList"][i-1]["key"]
            value = 0
            if key == nym + dd:
                value = float(rdc1[0]["mapList"][i-1]["value"])
            else:
                value = 0
        else:
            value = 0
        nowVal = nowVal + value
        rdcMap = {'key': nym + dd, 'value': nowVal}
        rdcList.append(rdcMap)
        dayGoal = 0
        dayLy = 0
        for gMap in goalList:
            if gMap["key"] == (nym + dd) :
                dayGoal = float(gMap["value"])
                break
        for lMap in lyList:
            if lMap["key"] == (nym + dd):
                dayLy = float(lMap["value"])
                break
        # 计算vs
        vsGoalMap = {'key': nym + dd, 'value': (nowVal-dayGoal)}
        vsLyMap = {'key': nym + dd, 'value': (nowVal-dayLy)}
        vsGoal.append(vsGoalMap)
        vsLy.append(vsLyMap)
        vsGoalLvMap = {'key': nym + dd, 'value': (nowVal/dayGoal)-1}
        vsLyLvMap = {'key': nym + dd, 'value': (nowVal/dayLy)-1}
        vsGoalLv.append(vsGoalLvMap)
        vsLyLv.append(vsLyLvMap)
        i = i+1;
    rdcCard = {'index': 'MRL1', 'mapList': rdcList}
    vsGoalCard = {'index': 'MRL4', 'mapList': vsGoal}
    vsLyCard = {'index': 'MRL5', 'mapList': vsLy}
    vsGoalLvCard = {'index': 'MRL6', 'mapList': vsGoalLv}
    vsLyLvCard = {'index': 'MRL7', 'mapList': vsLyLv}
    resList = [rdcCard, goalCard, lyCard, vsGoalCard, vsLyCard, vsGoalLvCard, vsLyLvCard]
    print resList

最后，是如何控制jython使用本机python的，指定python路径：

其中只有第一个put有用哦

Properties props = new Properties();
props.put("python.path", "/usr/bin/python");
props.put("python.console.encoding", "UTF-8");
props.put("python.security.respectJavaAccessibility", "false");
props.put("python.import.site", "false");

Properties preprops = System.getProperties();
PythonInterpreter.initialize(preprops, props, new String[0]);