Drools7.5.0教程（10）-drools规则流的使用

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Drools7.5.0教程（10）-drools规则流的使用

drools,是由JBOSS公司开源的一套基于JAVA的规则引擎系统

什么是规则流，规则流什么用？

规则流能够控制，规则中的复杂流程，在复杂业务中，很多时候并不需要触发所有的规则，很多时候需要触发的规则也需要，像程序一样，符合某些逻辑，如，当X对象X 属性等于 A 时，触发规则A 中的规则，当等于B时，触发规则B中的规则，这时候用规则流就能够很好的处理，这类问题。

规则流怎么使用

如何使用规则流？那我们就来写个例子来尝试下吧！我们还用老例子，输入一个分数，我们判断一个水平，如：60分及格，70-90分优秀，然后我们根据判断结果打印出对应的语句。

项目结构

创建实体类

package com.sample;public class ScoreRule {    //分数    private Integer score;    //注释    private String desc;    public Integer getScore() {        return score;    }    public void setScore(Integer score) {        this.score = score;    }    public String getDesc() {        return desc;    }    public void setDesc(String desc) {        this.desc = desc;    }}

创建规则文件，直接贴代码

package com.sampleimport com.sample.ScoreRule;//执行之后不重复执行no-loop//规则名rule "no-pass"//没过    //规则组名    ruleflow-group "score"    when        s: ScoreRule( score<60 )    then        s.setDesc( "no-pass" );        update( s );endrule "pass"//及格    ruleflow-group "score"    when        s: ScoreRule( score>=60&&score<70 )    then        s.setDesc( "pass" );        update( s );endrule "good"//良好    ruleflow-group "score"    when        s: ScoreRule( score>=70&&score<90 )    then        s.setDesc( "good" );        update( s );endrule "excellent"//优秀    ruleflow-group "score"    when        s: ScoreRule( score>=90&&score<100 )    then        s.setDesc( "excellent" );        update( s );endrule "perfect"//完美    ruleflow-group "score"    when        s: ScoreRule( score==100 )    then        s.setDesc( "perfect" );        update( s );end

修改kmodule.xml 文件

<?xml version="1.0" encoding="UTF-8"?><kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">    <kbase name="process" packages="process">        <ksession name="ksession-process"/>    </kbase></kmodule>

新建规则流文件 sample.bpmn

指定规则文件相关属性：
流程中指定，分数校验模块的规则组：
设置网关的判断条件：
编辑各条网关连接线的判断依据：
编辑分支流程继续执行的任务，在这，仅执行一个打印任务：

好了，我们可以编写测试代码了，代码如下：

package com.sample;import org.kie.api.KieServices;import org.kie.api.runtime.KieContainer;import org.kie.api.runtime.KieSession;/** * This is a sample file to launch a process. */public class ProcessTest {    public static final void main(String[] args) {        try {            KieServices ks = KieServices.Factory.get();            KieContainer kContainer = ks.getKieClasspathContainer();            KieSession kSession = kContainer.newKieSession("ksession-process");            //编写fact对象            ScoreRule rule=new ScoreRule();            rule.setScore(75);            kSession.insert(rule);            //执行所要执行的流程            kSession.startProcess("com.sample.bpmn.scorerule");            kSession.fireAllRules();          } catch (Throwable t) {            t.printStackTrace();        }    }}

好，我们来看看结果吧

没错，正确了执行了规则流，当然这个规则流非常简单，大家可以继续尝试更复杂的组件哦，最后，贴下，整个bpmn的代码，供大家参考

<?xml version="1.0" encoding="UTF-8"?> <definitions id="Definition"             targetNamespace="http://www.jboss.org/drools"             typeLanguage="http://www.java.com/javaTypes"             expressionLanguage="http://www.mvel.org/2.0"             xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"             xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL BPMN20.xsd"             xmlns:g="http://www.jboss.org/drools/flow/gpd"             xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI"             xmlns:dc="http://www.omg.org/spec/DD/20100524/DC"             xmlns:di="http://www.omg.org/spec/DD/20100524/DI"             xmlns:tns="http://www.jboss.org/drools">  <process processType="Private" isExecutable="true" id="com.sample.bpmn.scorerule" name="ScoreRule" tns:packageName="com.sample" >    <!-- nodes -->    <startEvent id="_1"  isInterrupting="true">    </startEvent>    <endEvent id="_3" >        <terminateEventDefinition />    </endEvent>    <businessRuleTask id="bbb899bd-5f36-4cae-89b6-0b89853a8192" name="分数校验" g:ruleFlowGroup="score"  implementation="http://www.jboss.org/drools/rule" >      <ioSpecification>        <inputSet>        </inputSet>        <outputSet>        </outputSet>      </ioSpecification>    </businessRuleTask>    <exclusiveGateway id="91cef05a-2603-4018-88ab-d6922ec1f808" name="Gateway" gatewayDirection="Diverging" >    </exclusiveGateway>    <scriptTask id="5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e" name="Script" scriptFormat="http://www.java.com/java" >      <script>System.out.println("恭喜你已经及格");</script>    </scriptTask>    <scriptTask id="084929f2-2d04-45cb-ba3d-ea2755ac402c" name="Script" >      <script>System.out.println("您的成绩是良好");</script>    </scriptTask>    <scriptTask id="54b211e0-c635-4fca-a7b8-4025a05cb3d3" name="Script" >      <script>System.out.println("优秀优秀！！！！");</script>    </scriptTask>    <scriptTask id="840beb7c-37a2-462b-a216-ae80b277ed21" name="Script" >      <script>System.out.println("恭喜您，满分！");</script>    </scriptTask>    <scriptTask id="6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29" name="Script" scriptFormat="http://www.java.com/java" >      <script>System.out.println("你没及格！");</script>    </scriptTask>    <endEvent id="f0ed00b1-39a9-4b27-9234-db4e57beecf9" name="End" >        <terminateEventDefinition />    </endEvent>    <endEvent id="067b5f8a-684d-49fc-9ca2-7c5e125528de" name="End" >        <terminateEventDefinition />    </endEvent>    <endEvent id="d09b3d2e-0483-484f-83be-fd1dedb58b6d" name="End" >        <terminateEventDefinition />    </endEvent>    <endEvent id="b10e26da-6f85-44e1-b49c-7eab1913a1d3" name="End" >        <terminateEventDefinition />    </endEvent>    <!-- connections -->    <sequenceFlow id="6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29-_3" sourceRef="6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29" targetRef="_3" />    <sequenceFlow id="_1-bbb899bd-5f36-4cae-89b6-0b89853a8192" sourceRef="_1" targetRef="bbb899bd-5f36-4cae-89b6-0b89853a8192" />    <sequenceFlow id="bbb899bd-5f36-4cae-89b6-0b89853a8192-91cef05a-2603-4018-88ab-d6922ec1f808" sourceRef="bbb899bd-5f36-4cae-89b6-0b89853a8192" targetRef="91cef05a-2603-4018-88ab-d6922ec1f808" />    <sequenceFlow id="91cef05a-2603-4018-88ab-d6922ec1f808-5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e" sourceRef="91cef05a-2603-4018-88ab-d6922ec1f808" targetRef="5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e" name="及格" tns:priority="1" >      <conditionExpression xsi:type="tFormalExpression" language="http://www.jboss.org/drools/rule" >s: ScoreRule( desc=="pass" )</conditionExpression>    </sequenceFlow>    <sequenceFlow id="91cef05a-2603-4018-88ab-d6922ec1f808-084929f2-2d04-45cb-ba3d-ea2755ac402c" sourceRef="91cef05a-2603-4018-88ab-d6922ec1f808" targetRef="084929f2-2d04-45cb-ba3d-ea2755ac402c" name="良好" tns:priority="1" >      <conditionExpression xsi:type="tFormalExpression" language="http://www.jboss.org/drools/rule" >s: ScoreRule( desc=="good" )</conditionExpression>    </sequenceFlow>    <sequenceFlow id="91cef05a-2603-4018-88ab-d6922ec1f808-54b211e0-c635-4fca-a7b8-4025a05cb3d3" sourceRef="91cef05a-2603-4018-88ab-d6922ec1f808" targetRef="54b211e0-c635-4fca-a7b8-4025a05cb3d3" name="优秀" tns:priority="1" >      <conditionExpression xsi:type="tFormalExpression" language="http://www.jboss.org/drools/rule" >s: ScoreRule( desc=="excellent" )</conditionExpression>    </sequenceFlow>    <sequenceFlow id="91cef05a-2603-4018-88ab-d6922ec1f808-840beb7c-37a2-462b-a216-ae80b277ed21" sourceRef="91cef05a-2603-4018-88ab-d6922ec1f808" targetRef="840beb7c-37a2-462b-a216-ae80b277ed21" name="完美" tns:priority="1" >      <conditionExpression xsi:type="tFormalExpression" language="http://www.jboss.org/drools/rule" >s: ScoreRule( desc=="perfect" )</conditionExpression>    </sequenceFlow>    <sequenceFlow id="91cef05a-2603-4018-88ab-d6922ec1f808-6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29" sourceRef="91cef05a-2603-4018-88ab-d6922ec1f808" targetRef="6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29" name="不及格" tns:priority="1" >      <conditionExpression xsi:type="tFormalExpression" language="http://www.jboss.org/drools/rule" >s: ScoreRule( desc=="no-pass" )</conditionExpression>    </sequenceFlow>    <sequenceFlow id="5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e-f0ed00b1-39a9-4b27-9234-db4e57beecf9" sourceRef="5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e" targetRef="f0ed00b1-39a9-4b27-9234-db4e57beecf9" />    <sequenceFlow id="084929f2-2d04-45cb-ba3d-ea2755ac402c-067b5f8a-684d-49fc-9ca2-7c5e125528de" sourceRef="084929f2-2d04-45cb-ba3d-ea2755ac402c" targetRef="067b5f8a-684d-49fc-9ca2-7c5e125528de" />    <sequenceFlow id="54b211e0-c635-4fca-a7b8-4025a05cb3d3-d09b3d2e-0483-484f-83be-fd1dedb58b6d" sourceRef="54b211e0-c635-4fca-a7b8-4025a05cb3d3" targetRef="d09b3d2e-0483-484f-83be-fd1dedb58b6d" />    <sequenceFlow id="840beb7c-37a2-462b-a216-ae80b277ed21-b10e26da-6f85-44e1-b49c-7eab1913a1d3" sourceRef="840beb7c-37a2-462b-a216-ae80b277ed21" targetRef="b10e26da-6f85-44e1-b49c-7eab1913a1d3" />  </process>  <bpmndi:BPMNDiagram>    <bpmndi:BPMNPlane bpmnElement="com.sample.bpmn.scorerule" >      <bpmndi:BPMNShape bpmnElement="_1" >        <dc:Bounds x="29" y="173" width="48" height="48" />      </bpmndi:BPMNShape>      <bpmndi:BPMNShape bpmnElement="_3" >        <dc:Bounds x="665" y="19" width="48" height="48" />      </bpmndi:BPMNShape>      <bpmndi:BPMNShape bpmnElement="bbb899bd-5f36-4cae-89b6-0b89853a8192" >        <dc:Bounds x="170" y="173" width="80" height="48" />      </bpmndi:BPMNShape>      <bpmndi:BPMNShape bpmnElement="91cef05a-2603-4018-88ab-d6922ec1f808" >        <dc:Bounds x="354" y="172" width="48" height="48" />      </bpmndi:BPMNShape>      <bpmndi:BPMNShape bpmnElement="5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e" >        <dc:Bounds x="491" y="98" width="80" height="48" />      </bpmndi:BPMNShape>      <bpmndi:BPMNShape bpmnElement="084929f2-2d04-45cb-ba3d-ea2755ac402c" >        <dc:Bounds x="493" y="170" width="80" height="48" />      </bpmndi:BPMNShape>      <bpmndi:BPMNShape bpmnElement="54b211e0-c635-4fca-a7b8-4025a05cb3d3" >        <dc:Bounds x="496" y="240" width="80" height="48" />      </bpmndi:BPMNShape>      <bpmndi:BPMNShape bpmnElement="840beb7c-37a2-462b-a216-ae80b277ed21" >        <dc:Bounds x="496" y="313" width="80" height="48" />      </bpmndi:BPMNShape>      <bpmndi:BPMNShape bpmnElement="6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29" >        <dc:Bounds x="492" y="22" width="80" height="48" />      </bpmndi:BPMNShape>      <bpmndi:BPMNShape bpmnElement="f0ed00b1-39a9-4b27-9234-db4e57beecf9" >        <dc:Bounds x="670" y="101" width="48" height="48" />      </bpmndi:BPMNShape>      <bpmndi:BPMNShape bpmnElement="067b5f8a-684d-49fc-9ca2-7c5e125528de" >        <dc:Bounds x="671" y="175" width="48" height="48" />      </bpmndi:BPMNShape>      <bpmndi:BPMNShape bpmnElement="d09b3d2e-0483-484f-83be-fd1dedb58b6d" >        <dc:Bounds x="675" y="255" width="48" height="48" />      </bpmndi:BPMNShape>      <bpmndi:BPMNShape bpmnElement="b10e26da-6f85-44e1-b49c-7eab1913a1d3" >        <dc:Bounds x="681" y="326" width="48" height="48" />      </bpmndi:BPMNShape>      <bpmndi:BPMNEdge bpmnElement="6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29-_3" >        <di:waypoint x="532" y="46" />        <di:waypoint x="689" y="43" />      </bpmndi:BPMNEdge>      <bpmndi:BPMNEdge bpmnElement="_1-bbb899bd-5f36-4cae-89b6-0b89853a8192" >        <di:waypoint x="53" y="197" />        <di:waypoint x="210" y="197" />      </bpmndi:BPMNEdge>      <bpmndi:BPMNEdge bpmnElement="bbb899bd-5f36-4cae-89b6-0b89853a8192-91cef05a-2603-4018-88ab-d6922ec1f808" >        <di:waypoint x="210" y="197" />        <di:waypoint x="378" y="196" />      </bpmndi:BPMNEdge>      <bpmndi:BPMNEdge bpmnElement="91cef05a-2603-4018-88ab-d6922ec1f808-5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e" >        <di:waypoint x="378" y="196" />        <di:waypoint x="531" y="122" />      </bpmndi:BPMNEdge>      <bpmndi:BPMNEdge bpmnElement="91cef05a-2603-4018-88ab-d6922ec1f808-084929f2-2d04-45cb-ba3d-ea2755ac402c" >        <di:waypoint x="378" y="196" />        <di:waypoint x="533" y="194" />      </bpmndi:BPMNEdge>      <bpmndi:BPMNEdge bpmnElement="91cef05a-2603-4018-88ab-d6922ec1f808-54b211e0-c635-4fca-a7b8-4025a05cb3d3" >        <di:waypoint x="378" y="196" />        <di:waypoint x="536" y="264" />      </bpmndi:BPMNEdge>      <bpmndi:BPMNEdge bpmnElement="91cef05a-2603-4018-88ab-d6922ec1f808-840beb7c-37a2-462b-a216-ae80b277ed21" >        <di:waypoint x="378" y="196" />        <di:waypoint x="536" y="337" />      </bpmndi:BPMNEdge>      <bpmndi:BPMNEdge bpmnElement="91cef05a-2603-4018-88ab-d6922ec1f808-6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29" >        <di:waypoint x="378" y="196" />        <di:waypoint x="532" y="46" />      </bpmndi:BPMNEdge>      <bpmndi:BPMNEdge bpmnElement="5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e-f0ed00b1-39a9-4b27-9234-db4e57beecf9" >        <di:waypoint x="531" y="122" />        <di:waypoint x="694" y="125" />      </bpmndi:BPMNEdge>      <bpmndi:BPMNEdge bpmnElement="084929f2-2d04-45cb-ba3d-ea2755ac402c-067b5f8a-684d-49fc-9ca2-7c5e125528de" >        <di:waypoint x="533" y="194" />        <di:waypoint x="695" y="199" />      </bpmndi:BPMNEdge>      <bpmndi:BPMNEdge bpmnElement="54b211e0-c635-4fca-a7b8-4025a05cb3d3-d09b3d2e-0483-484f-83be-fd1dedb58b6d" >        <di:waypoint x="536" y="264" />        <di:waypoint x="699" y="279" />      </bpmndi:BPMNEdge>      <bpmndi:BPMNEdge bpmnElement="840beb7c-37a2-462b-a216-ae80b277ed21-b10e26da-6f85-44e1-b49c-7eab1913a1d3" >        <di:waypoint x="536" y="337" />        <di:waypoint x="705" y="350" />      </bpmndi:BPMNEdge>    </bpmndi:BPMNPlane>  </bpmndi:BPMNDiagram></definitions>

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