直接上代码:

第一步，maven引入相关包

     
         
      
       4.0.0
          
      
       com.example
          
      
       demo
          
      
       0.0.1-SNAPSHOT
          
      
       jar
          
      
       demo
          
      
       Demo project for Spring Boot
          
              
       
        org.springframework.boot
               
       
        spring-boot-starter-parent
               
       
        2.0.1.RELEASE
               
        
           
          
              
       
        UTF-8
               
       
        UTF-8
               
       
        1.8
               
       
        6.1.0.Final
           
          
              
                   
        
         org.springframework.boot
                    
        
         spring-boot-starter
                
               
                   
        
         org.springframework.boot
                    
        
         spring-boot-starter-test
                    
        
         test
                
               
                   
        
         org.springframework.boot
                    
        
         spring-boot-starter-webflux
                
               
                   
        
         org.kie
                    
        
         kie-spring
                    
        
         ${drools.version}
                
               
                   
        
         org.drools
                    
        
         drools-compiler
                    
        
         ${drools.version}
                
           
          
              
                   
                        
         
          org.springframework.boot
                         
         
          spring-boot-maven-plugin
                     
                
           
      
     

 

 

第二步，编写一个规则文件:

//包名package testimport com.example.demo.drools.test.Stu;//rule 就是三大块中的规则体，以rule开头，以end 结尾，每个规则文件可以包含多个rule。规则体分为三个部分，LHS RHS 属性 三大部分//LHS：条件部分又被称之为 LeftHand Side，简称为 LHS，在一个规则当中 when 与 then 中间的部分就是 LHS 部分。//在 LHS 当中，可以包含 0~n 个条件，如果 LHS 部分没空的话，那么引擎会自动添加一个eval(true)的条件，由于该条件总是返回 true，所以 LHS 为空的规则总是返回 true。//RHS：结果部分又被称之为 RightHand Side，简称为 RHS，在一个规则当中 then后面部分就是 RHS，只有在 LHS 的所有条件都满足时 RHS 部分才会执行。rule "rule1"    salience 1        when            $stu:Stu(age>30)//这里就是LHS        then            System.out.println("age>30岁的人:"+$stu.getName());//RHSendrule "rule2"    salience 2    when         $stu:Stu(gender=="male",age>25)    then        System.out.println("性别为男,age>25岁的人:"+$stu.getName());     endrule "rule3"     salience 3     when        $stu:Stu(getName()=="张三")        then         System.out.println("名字为:"+$stu.getName());         end

 

 

第三步：测试代码

package com.example.demo.drools.test;import org.drools.core.io.impl.ClassPathResource;import org.kie.api.io.ResourceType;import org.kie.internal.KnowledgeBase;import org.kie.internal.KnowledgeBaseFactory;import org.kie.internal.builder.KnowledgeBuilder;import org.kie.internal.builder.KnowledgeBuilderFactory;import org.kie.internal.definition.KnowledgePackage;import org.kie.internal.runtime.StatefulKnowledgeSession;import java.util.ArrayList;import java.util.Collection;import java.util.List;/** * Created by ming on 2018/5/24. */public class Test {    public static void main(String[] args) {        KnowledgeBuilder kb = KnowledgeBuilderFactory.newKnowledgeBuilder();        kb.add(new ClassPathResource("test.drl"), ResourceType.DRL);        Collection
     
       collection = kb.getKnowledgePackages();        KnowledgeBase knowledgeBase = KnowledgeBaseFactory.newKnowledgeBase();        knowledgeBase.addKnowledgePackages(collection);        StatefulKnowledgeSession statefulSession = knowledgeBase.newStatefulKnowledgeSession();        List
      
        list = getStus();        for (Stu stu : list) {            statefulSession.insert(stu);        }        statefulSession.fireAllRules();        statefulSession.dispose();        System.out.println("end....");    }    public static List
       
         getStus() {        List
        
          stus = new ArrayList<>();        stus.add(new Stu("张三", 16, "male"));        stus.add(new Stu("huhu", 18, "male"));        stus.add(new Stu("王五", 32, "male"));        stus.add(new Stu("张红", 23, "female"));        stus.add(new Stu("李四", 35, "male"));        stus.add(new Stu("张小雅", 31, "female"));        return stus;    }}
        
       
      
     

 

package com.example.demo.drools.test;/** * Created by Administrator on 2018/5/24. */public class Stu {    private String name;    private int age;    private String gender;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getGender() {        return gender;    }    public void setGender(String gender) {        this.gender = gender;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    public Stu(String name,int age,String gender){        this.name=name;        this.age=age;        this.gender=gender;    }}

 

 

然后看见规则文件生效了....