Drools的HelloWord例子

添加drools框架运行的依赖

<!--Drools 规则相关 -->
        <dependency>
            <groupId>org.drools</groupId>
            <artifactId>drools-core</artifactId>
            <version>6.5.0.Final</version>
        </dependency>

        <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<ksession name="helloworld"/> 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

<?xml version="1.0" encoding="UTF-8"?>
<kmodule xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://www.drools.org/xsd/kmodule">
    
    <!-- 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>
</kmodule>

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