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package com.sampleimport com.sample.DroolsTest.Message;rule "Hello World"whenm : Message( status == Message.HELLO, myMessage : message )thenSystem.out.println( myMessage );m.setMessage( "Goodbye cruel world" );m.setStatus( Message.GOODBYE );update( m );
endrule "GoodBye"whenMessage( status == Message.GOODBYE, myMessage : message )thenSystem.out.println( myMessage );
end

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rule "name"attributeswhenLHSthenRHS
end

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when$customer:Customer()
then……when$customer:Customer(age>20,gender==􏰃male􏰃)Order(customer==$customer,price>1000)
then……whenCustomer(age>20 || (gender=='male' && city==‘sh'))
then……

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>、>=、<、<=、= =、!=、contains、not contains、 memberof、not memberof、matches、not matches

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when$order:Order();$customer:Customer(age >20, orders contains$order);
then……when$order:Order(name memberOf orderNames); # orderNames为数组或集合类型
then……when$customer:Customer(name matches "李.*"); # 正则表达式匹配
then……

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when……
thenCustomer cus=new Customer();cus.setName("张三");insert(cus);when$customer:Customer(name=="张三",age<10);
then$customer.setAge($customer.getAge()+1);update($customer);when$customer:Customer(name=="张三",age<10);
thenCustomer customer=new Customer();customer.setName("张三");customer.setAge($customer.getAge()+1);# 用新对象替换Working Memory中的旧对象update(drools.getWorkingMemory().getFactHandleByIdentity($customer),customer);when$customer:Customer(name=="张三");
thenretract($customer);

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modify(fact-expression){<修改 Fact 属性的表达式>[,<修改 Fact 属性的表达式>*]
}when$customer:Customer(name=="张三",age==20);
thenmodify($customer){setId("super man"),setAge(30)}

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wheneval(true);
thenCustomer cus=new Customer();cus.setName("张三");drools.insert(cus)

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package test;
import org.drools.runtime.rule.Activation;
import org.drools.runtime.rule.AgendaFilter;public class TestAgendaFilter implements AgendaFilter {private String startName;public TestAgendaFilter(String startName){this.startName=startName;}public boolean accept(Activation activation) {String ruleName=activation.getRule().getName();if(ruleName.startsWith(this.startName)){return true;}else{return false;}}
}

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rule "rule1"salience 1when……

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/* 规则rule1的注释
这是一个测试用规则
*/
rule "rule1"wheneval(true) #没有条件判断thenSystem.out.println("rule1 execute"); //仅仅是输出
end

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declare Addresscity : StringaddressName : String
enddeclare Personname:Stringbirthday:Dateaddress:Address //使用declare声明的对象作为address属性类型order:Order //使用名为Order的JavaBean作为order属性类型
end

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//获取规则文件当中定义的Address对象并对其进行实例化
FactType addressType=knowledgeBase.getFactType("test","Address");
Object add=addressType.newInstance();
addressType.set(add, "city","Beijing");
addressType.set(add, "addressName","Capital");

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declare User@createTime(2009-10-25)username : String @maxLenth(30)userid : String @keybirthday : java.util.Date
end

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package test
import java.util.List;
import java.util.ArrayList;
/*
一个测试函数
用来向Customer对象当中添加指定数量的Order对象的函数
*/function void setOrder(Customer customer,int orderSize) {List ls=new ArrayList();for(int i=0;i< orderSize;i++){Order order=new Order();ls.add(order);}customer.setOrders(ls);
}/*
测试规则
*/
rule "rule1" when$customer :Customer();
thensetOrder($customer,5);System.out.println("rule 1 customer has order size:"+$customer.getOrders().size());
end/*
测试规则
*/
rule "rule2" when$customer :Customer();
thensetOrder($customer,10);System.out.println("rule 2 customer has order size:"+$customer.getOrders().size());
end

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package test;
public class RuleTools {public static void printInfo(String name){System.out.println("your name is :"+name);}
}

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package test
import function test.RuleTools.printInfo;
/*
测试规则
*/
rule "rule1"wheneval(true);thenprintInfo("test import function");
end

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query "testQuery"customer:Customer(age>30,orders.size >10)
endquery "testQuery2"(int$age,String$gender)customer:Customer(age>$age,gender==$gender)
end

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……
QueryResults queryResults=statefulSession.getQueryResults("testQuery");
for(QueryResultsRow qr:queryResults){Customer cus=(Customer)qr.get("customer"); //打印查询结果System.out.println("customer name :"+cus.getName());
}QueryResults queryResults2=statefulSession.getQueryResults("testQuery2", new Object[]{new Integer(20),"F"});……