Java資料處理的實例程式碼

　　對於形如「(TYPE=SITA##)&&(((CTYP=FPL##)||(CTYP=CHG##)||(CTYP=CNL##)||(CTYP=DLA## )||(CTYP=DL##)||(CTYP=ED##))&&(ADEP=ZSSS##))」的字串，常以某個事物的判定條件出現，要計算出整個條件最後的結果（true/false）。

　　以下給出Java程式碼

  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 }

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