2016-07-06 43 views
1

我正在用Java开发一个系统来检查文本中关键字组合的出现。例如,我有以下表达式来检查:(yellow || red) && sofa。 我把这项工作分为两个步骤。第一个是检测文本中的单词。 第二个是使用结果来检查布尔表达式。 经过简短的网页搜索之后,我选择了Apache JEXL。Java Apache JEXL布尔表达式问题

// My web app contains a set of preconfigured keywords inserted by administrator: 
List<String> system_occurence =new ArrayList<String>() {{ 
    add("yellow"); 
    add("brown"); 
    add("red"); 
    add("kitchen"); 
    add("sofa");   
}}; 


// The method below check if some of system keywords are in the text 
List<String> occurence = getOccurenceKeywordsInTheText(); 
for (String word :occurrence){ 
    jexlContext.set(word,true); 
} 

// Set to false system keywords not in the text 
system_occurence.removeAll(occurence); 
for (String word :system_occurence){ 
    jexlContext.set(word,false); 
} 


// Value the boolean expression 
String jexlExp ="(yellow || red) && sofa"; 
JexlExpression e = jexl.createExpression(jexlExp_ws_keyword_matching); 

Boolean o = (Boolean) e.evaluate(jexlContext); 

在上面的例子中,我在布尔表达式中使用了简单的单词。使用ASCII和非复合词我没有问题。 我在布尔表达式中遇到了非ASCII和复合关键字的问题,因为我不能将它们用作变量名称。

// The below example fails, JEXL launch Exception 
String jexlExp ="(Lebron James || red) && sofa"; 

// The below example fails, JEXL launch Exception 
String jexlExp ="(òsdà || red) && sofa"; 

我该如何解决?我的方式是否正确?

对不起,我的英语不好:)

回答

0

尝试一些其他的角色就像下划线来代替空格(_)。

package jexl; 



    import org.apache.commons.jexl3.*; 

    import java.util.ArrayList; 
    import java.util.Arrays; 
    import java.util.List; 

    public class Test2 { 

    private static final JexlEngine JEXL_ENGINE = new JexlBuilder().cache(512).strict(false).silent(false).create(); 
    public static void main(String[] args) { 
     // My web app contains a set of preconfigured keywords inserted by administrator: 
     List<String> system_occurence =new ArrayList<String>() {{ 
      add("yellow"); 
      add("brown"); 
      add("red"); 
      add("kitchen"); 
      add("sofa"); 
     }}; 

     JexlContext jexlContext = new MapContext(); 

// The method below check if some of system keywords are in the text 
     List<String> occurence = Arrays.asList("kitchen"); 
     for (String word :occurence){ 
      jexlContext.set(word,true); 
     } 

// Set to false system keywords not in the text 
     system_occurence.removeAll(occurence); 
     for (String word :system_occurence){ 
      jexlContext.set(word,false); 
     } 


// Value the boolean expression 
     String jexlExp ="(Lebron_James || red) && sofa"; 
     JexlExpression e = JEXL_ENGINE.createExpression(jexlExp); 

     Boolean o = (Boolean) e.evaluate(jexlContext); 

     System.out.println(o); 
    } 

}