Java数据处理

　　对于形如“(TYPE=SITA##)&&(((CTYP=FPL##)||(CTYP=CHG##)||(CTYP=CNL##)||(CTYP=DLA##)||(CTYP=DL##)||(CTYP=ED##))&&(ADEP=ZSSS##))”的字符串，常以某个事物的判定条件出现，要计算出整个条件最后的结果（true/false）。

　　以下给出Java代码

  1 package com.test;
  2 
  3 import net.sourceforge.jeval.Evaluator;
  4 
  5 public class T1 {
  6 
  7     public static void main(String[] args) throws Exception {
  8         String condition ="(TYPE=SITA##)&&(((CTYP=FPL##)||(CTYP=CHG##)||(CTYP=CNL##)||(CTYP=DLA##)||(CTYP=DL##)||(CTYP=ED##))&&(ADEP=ZSSS##))";
  9         condition = replaceExpression(condition, "TYPE=", "SITA", "=");
 10         condition = replaceExpression(condition, "CTYP=", "FPL", "=");
 11         condition = replaceExpression(condition, "ADEP=", "", "=");
 12         System.out.println("condition："+condition);  //condition：(1)&&(((1)||(0)||(0)||(0)||(0)||(0))&&(0))
 13         
 14         /**
 15          * 数字表达式解析工具
 16          *    Evaluator需要下载jeval包，本文后附上链接
 17          */
 18         Evaluator evaluator = new Evaluator();
 19         boolean b = evaluator.getBooleanResult(condition);  // false
 20         System.out.println(b);        
 21         System.out.println(evaluator.evaluate("2+3"));  // 5.0
 22         
 23     }
 24     
 25     /**
 26      * 
 27      * @param condition
 28      * @param replace
 29      * @param toBeCompared
 30      * @param operators
 31      * @return
 32      * @throws Exception 对于不符合计算的会抛出异常
 33      */
 34     public static String replaceExpression(String condition, String replace,
 35             String toBeCompared, String operators) throws Exception {
 36         while (condition.contains(replace)) {
 37             int start = condition.indexOf(replace);
 38             int end = condition.indexOf("##", start);
 39             String express = condition.substring(start, end);
 40             express = express.substring(replace.length());
 41             if (">=".equals(operators)) {
 42 
 43                 if (Long.parseLong(toBeCompared) >= Long.parseLong(express)) {
 44                     condition = condition.substring(0, start) + "1"
 45                             + condition.substring(end + 2);
 46                 } else {
 47                     condition = condition.substring(0, start) + "0"
 48                             + condition.substring(end + 2);
 49                 }
 50             } else if ("<=".equals(operators)) {
 51                 if (Long.parseLong(toBeCompared) <= Long.parseLong(express)) {
 52                     condition = condition.substring(0, start) + "1"
 53                             + condition.substring(end + 2);
 54                 } else {
 55                     condition = condition.substring(0, start) + "0"
 56                             + condition.substring(end + 2);
 57                 }
 58             } else if (">".equals(operators)) {
 59 
 60                 if (Long.parseLong(toBeCompared) > Long.parseLong(express)) {
 61                     condition = condition.substring(0, start) + "1"
 62                             + condition.substring(end + 2);
 63                 } else {
 64                     condition = condition.substring(0, start) + "0"
 65                             + condition.substring(end + 2);
 66                 }
 67             } else if ("<".equals(operators)) {
 68                 if (Long.parseLong(toBeCompared) < Long.parseLong(express)) {
 69                     condition = condition.substring(0, start) + "1"
 70                             + condition.substring(end + 2);
 71                 } else {
 72                     condition = condition.substring(0, start) + "0"
 73                             + condition.substring(end + 2);
 74                 }
 75             } else if ("!=".equals(operators)) {
 76                 if (!express.equals(toBeCompared)) {
 77                     condition = condition.substring(0, start) + "1"
 78                             + condition.substring(end + 2);
 79                 } else {
 80                     condition = condition.substring(0, start) + "0"
 81                             + condition.substring(end + 2);
 82                 }
 83             } else {
 84                 if ("RADDRESS=".equals(replace)) {
 85                     String[] toBeComparedArray = toBeCompared.split(" ");
 86                     String flag = "0";
 87                     for (String toBeComparedString : toBeComparedArray) {
 88                         if (express.equals(toBeComparedString)) {
 89                             flag = "1";
 90                             break;
 91                         }
 92                     }
 93                     condition = condition.substring(0, start) + flag
 94                             + condition.substring(end + 2);
 95 
 96                 } else {
 97                     if (express.equals(toBeCompared)) {
 98                         condition = condition.substring(0, start) + "1"
 99                                 + condition.substring(end + 2);
100                     } else {
101                         condition = condition.substring(0, start) + "0"
102                                 + condition.substring(end + 2);
103                     }
104                 }
105             }
106         }
107         return condition;
108     }
109 }

相关jar包下载：http://files.cnblogs.com/files/x-jingxin/jeval.zip

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原文地址：https://www.cnblogs.com/x-jingxin/p/6934408.html