Drool实战系列(一)之入门程序

Drools官网地址为:https://www.drools.org/

maven环境

入门程序例子如下:

项目结构截图:

 

 

 

一、导入pom文件

 

<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>

 

二、准备JavaBean

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+"]";  }  }  

 

 三、在resource下建立rule文件夹编写drl文件

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 

 

四、编写kmodule.xml文件

<?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>  

 五、编写测试类

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();  }  
}