drools6入门例子

电玩女神 2022-08-04 05:16 236阅读 0赞

项目结构如下：

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pom.xml依赖：

<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>

person.drl规则文件为：

package com.person;
     
    import com.lala.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

kmodule.xml

<?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>

Person.java

package com.lala.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+"]";
        }
    }

测试文件：

package com.lala.mydrools;
    
    import org.kie.api.KieServices;
    import org.kie.api.runtime.KieContainer;
    import org.kie.api.runtime.KieSession;
    
    import com.lala.bean.Person;
    
    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("白展堂", 68);
            Person p2 = new Person("李大嘴", 32);
            Person p3 = new Person("佟湘玉", 18);
            Person p4 = new Person("郭芙蓉", 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();
        }
    }

运行，输出为：

before p1 : [name=白展堂,age=68,desc=null]
    before p2 : [name=李大嘴,age=32,desc=null]
    before p3 : [name=佟湘玉,age=18,desc=null]
    before p4 : [name=郭芙蓉,age=8,desc=null]
    总执行了4条规则
    after p1 : [name=白展堂,age=68,desc=老年]
    after p2 : [name=李大嘴,age=32,desc=中年]
    after p3 : [name=佟湘玉,age=18,desc=青年]
    after p4 : [name=郭芙蓉,age=8,desc=少年]

[Center]: /images/20220731/eb020b88256b497ab11ae1bca06c22a0.png