DROOLS6 Introductory Example

The project structure is as follows:

Pom.xml 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>

The PERSON.DRL rule file is:

Package Com.person; Import Com.lala.bean.Person; Rule ' Boy '    salience 1    when        $p: person (age > 0);    Then        $p. Setdesc ("juvenile");        Retract ($p); End rule "Youth"    salience 2    when        $p: Who (age >);    Then        $p. Setdesc ("Youth");        Retract ($p); End rule "Midlife"    salience 3    when        $p: Who (age >);    Then        $p. Setdesc ("middle age");        Retract ($p); end rule ' old '    salience 4    when        $p: person (age >);    Then        $p. Setdesc ("old age");        Retract ($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.) {        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+ "]";    }}

Test file:

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 () {K                 Ieservices 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 ("Bai Zhantong", 68);        person P2 = new person ("Li Mouth", 32);        Person P3 = new Person ("Tong Xiang Yu", 18);                person P4 = new Person ("Guofu", 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 ("Always executed" +count+ "rule");        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 (); }}

Run, output is:

Before P1: [Name= Bai Zhantong, age=68,desc=null]before p2: [Name= li da Zui, age=32,desc=null]before p3: [Name= Shang, Age=18,desc=null] Before P4: [Name= Guofu, Age=8,desc=null] always performed 4 rules after P1: [Name= Bai Zhantong, age=68,desc= old]after p2: [Name= li da Zui, age=32,desc= middle age] After P3: [Name= Shang, age=18,desc= youth]after P4: [Name= Guofu, age=8,desc= teenager]

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DROOLS6 Introductory Example