使用方法:
直接调用IntervalUtil.isInTheInterval(String data_value,String interval)
工具类 IntervalUtil
package com.github.pig.admin.utils;import javax.script.ScriptEngine;import javax.script.ScriptEngineManager;/*** 判断一个数是否再数学区间*/public class IntervalUtil {/*** 判断data_value是否在interval区间范围内* @author: kangyl17909* @date: 7月3日* @param data_value 数值类型的* @param interval 正常的数学区间,包括无穷大等,如:(1,3)、>5%、(-∞,6]、(125%,135%)U(70%,80%)* @return true:表示data_value在区间interval范围内,false:表示data_value不在区间interval范围内*/public static boolean isInTheInterval(String data_value,String interval) {//将区间和data_value转化为可计算的表达式String formula = getFormulaByAllInterval(data_value,interval,"||");ScriptEngine jse = new ScriptEngineManager().getEngineByName("JavaScript");try {//计算表达式return (Boolean) jse.eval(formula);} catch (Exception t) {return false;}}/*** 将所有阀值区间转化为公式:如* [75,80) =》 date_value < 80 && date_value >= 75* (125%,135%)U(70%,80%) =》 (date_value < 1.35 && date_value > 1.25) || (date_value < 0.8 && date_value > 0.7)* @param date_value* @param interval 形式如:(125%,135%)U(70%,80%)* @param connector 连接符 如:") || ("*/public static String getFormulaByAllInterval(String date_value, String interval, String connector) {StringBuffer buff = new StringBuffer();for(String limit:interval.split("U")){//如:(125%,135%)U (70%,80%)buff.append("(").append(getFormulaByInterval(date_value, limit," && ")).append(")").append(connector);}String allLimitInvel = buff.toString();int index = allLimitInvel.lastIndexOf(connector);allLimitInvel = allLimitInvel.substring(0,index);return allLimitInvel;}/*** 将整个阀值区间转化为公式:如* 145)=》 date_value < 145* [75,80) =》 date_value < 80 && date_value >= 75* @param date_value* @param interval 形式如:145)、[75,80)* @param connector 连接符 如:&&*/public static String getFormulaByInterval(String date_value, String interval, String connector) {StringBuffer buff = new StringBuffer();for(String halfInterval:interval.split(",")){//如:[75,80)、≥80buff.append(getFormulaByHalfInterval(halfInterval, date_value)).append(connector);}String limitInvel = buff.toString();int index = limitInvel.lastIndexOf(connector);limitInvel = limitInvel.substring(0,index);return limitInvel;}/*** 将半个阀值区间转化为公式:如* 145)=》 date_value < 145* ≥80%=》 date_value >= 0.8* [130=》 date_value >= 130* <80%=》 date_value < 0.8* @param halfInterval 形式如:145)、≥80%、[130、<80%* @param date_value* @return date_value < 145*/public static String getFormulaByHalfInterval(String halfInterval, String date_value) {halfInterval = halfInterval.trim();if(halfInterval.contains("∞")){//包含无穷大则不需要公式return "1 == 1";}StringBuffer formula = new StringBuffer();String data = "";String opera = "";if(halfInterval.matches("^([<>≤≥\\[\\(]{1}(-?\\d+.?\\d*\\%?))$")){//表示判断方向(如>)在前面 如:≥80%opera = halfInterval.substring(0,1);data = halfInterval.substring(1);}else{//[130、145)opera = halfInterval.substring(halfInterval.length()-1);data = halfInterval.substring(0,halfInterval.length()-1);}double value = dealPercent(data);formula.append(date_value).append(" ").append(opera).append(" ").append(value);String a = formula.toString();//转化特定字符return a.replace("[", ">=").replace("(", ">").replace("]", "<=").replace(")", "<").replace("≤", "<=").replace("≥", ">=");}/*** 去除百分号,转为小数* @param str 可能含百分号的数字* @return*/public static double dealPercent(String str){double d = 0.0;if(str.contains("%")){str = str.substring(0,str.length()-1);d = Double.parseDouble(str)/100;}else{d = Double.parseDouble(str);}return d;}public static void main(String[] args) {IntervalUtil a = new IntervalUtil();System.out.println(a.isInTheInterval("6.1", "(-∞,6]"));}}
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