添加drools框架运行的依赖

org.drools drools-core 6.5.0.Final

    <dependency>  
        <groupId>org.kie</groupId>  
        <artifactId>kie-api</artifactId>  
        <version>6.5.0.Final</version>  
    </dependency>

    <dependency>  
        <groupId>org.drools</groupId>  
        <artifactId>drools-compiler</artifactId>  
        <version>6.5.0.Final</version>  
    </dependency>

public class DroolsHelloWorld {
public static void main(String[] args) {
// Class.forName( "org.drools.compiler.kie.builder.impl.KieServicesImpl" ).newInstance()
KieServices kieServices = KieServices.Factory.get();
//会去 resource/META-INF 下找 kmodule.xml 文件
KieContainer kieContainer = kieServices.getKieClasspathContainer();
// kmodule.xml中 name值
KieSession kieSession = kieContainer.newKieSession("helloworld");
//启用规则
Set set=new HashSet();
set.add("helloworld1");
set.add("helloworld2");
int a = kieSession.fireAllRules();
/*FactHandle factHandle2 = kieSession.insert("456");
int b = kieSession.fireAllRules(new RuleNameEndsWithAgendaFilter("helloWorld1"));
kieSession.delete(factHandle2);*/
kieSession.dispose();
}
}

META-INF/kmodule.xml文件

<!-- packages 指向规则文件目录 -->  
<kbase name="hello" packages="com.dinpay.drools.helloworld">  
    <!-- name在 创建 KIEsession 会用到 -->  
    <ksession name="helloworld"/>  
</kbase>

<!-- packages 指向规则文件目录   -->  
<kbase name="helloUpgraded" packages="com.dinpay.drools.helloworldUpgraded">  
    <ksession name="helloworldUpgraded"/>  
</kbase>

    <!-- packages 指向规则文件目录   -->  
<kbase name="dinpay" packages="rule2">  
    <ksession name="dinpayRule"/>  
</kbase>  

droolsHelloWorld.drl脚本编写

rule helloWorld2
salience 100
lock-on-active true
when
eval(true)
then
System.out.println("Helloworld drools2! ");
end

rule helloWorld1
salience 100
lock-on-active true
when
eval(true)
then

  System.out.println("Helloworld drools1!  ");  

end