<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>cn.drools</groupId>

  <artifactId>drools-demo</artifactId>

  <version>0.0.1-SNAPSHOT</version>

  <dependencies>

  	    <dependency>

        <groupId>org.drools</groupId>

        <artifactId>drools-core</artifactId>

        <version>6.2.0.Final</version>

    </dependency>

    <dependency>

        <groupId>org.drools</groupId>

        <artifactId>drools-compiler</artifactId>

        <version>6.2.0.Final</version>

    </dependency>

  </dependencies>

</project>

package com.test.bean;

public class Person {

     private String name;

        private int age;

        private String desc;  

        public Person(String name, int age) {

            this.name = name;

            this.age = age;

        }

        public String getName() {

            return name;

        }

        public void setName(String name) {

            this.name = name;

        }

        public int getAge() {

            return age;

        }

        public void setAge(int age) {

            this.age = age;

        }

        public String getDesc() {

            return desc;

        }

        public void setDesc(String desc) {

            this.desc = desc;

        }

        public String toString()

        {

            return "[name="+name+",age="+age+",desc="+desc+"]";

        }

    }  

package com.person;  

import com.test.bean.Person;  

rule "boy"

    salience 1

    when

        $p : Person(age > 0);

    then

        $p.setDesc("少年");

        retract($p);

end  

rule "youth"

    salience 2

    when

        $p : Person(age > 12);

    then

        $p.setDesc("青年");

        retract($p);

end  

rule "midlife"

    salience 3

    when

        $p : Person(age > 24);

    then

        $p.setDesc("中年");

        retract($p);

end  

rule "old"

    salience 4

    when

        $p : Person(age > 60);

    then

        $p.setDesc("老年");

        retract($p);

end

<?xml version="1.0" encoding="UTF-8"?>

<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">

    <kbase name="SimpleRuleKBase" packages="rule">

        <ksession name="simpleRuleKSession" default="true"/>

    </kbase>

</kmodule>

package com.test.bean;

import org.kie.api.KieServices;

import org.kie.api.runtime.KieContainer;

import org.kie.api.runtime.KieSession;

public class Test {

     static KieSession getSession()

        {

            KieServices ks = KieServices.Factory.get();  

            KieContainer kc = ks.getKieClasspathContainer();  

            return kc.newKieSession("simpleRuleKSession");

        }

        public static void main(String[] args)

        {

            KieSession ks = getSession();  

            Person p1 = new Person("A", 68);

            Person p2 = new Person("B", 32);

            Person p3 = new Person("C", 18);

            Person p4 = new Person("D", 8);  

            System.out.println("before p1 : " + p1);

            System.out.println("before p2 : " + p2);

            System.out.println("before p3 : " + p3);

            System.out.println("before p4 : " + p4);  

            ks.insert(p1);

            ks.insert(p2);

            ks.insert(p3);

            ks.insert(p4);  

            int count = ks.fireAllRules();

            System.out.println("总执行了"+count+"条规则");

            System.out.println("after p1 : " + p1);

            System.out.println("after p2 : " + p2);

            System.out.println("after p3 : " + p3);

            System.out.println("after p4 : " + p4);

            ks.dispose();

        }

}