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 }相關jar套件下載：
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