Step 1.
新建一個Drools項目
選擇第一個,新建一個空項目,點擊Next,輸入項目名,點擊Finish完成創建
此時會自動生成一些目錄結構
src.main.java.com.sample中存放java程序
src.main.resources.com.sample中存放drools文件,分別爲dtables決策表、process規則流、rules規則
Step 2.
添加JUnit單元測試框架,用來完成後面的項目運行工作
項目名稱上單擊鼠標右鍵,選擇Build Path→Configure Build Path
選擇Java Build Path→Libraries→Add Library→JUnit→Next,選擇JUnit版本點擊Finish,應用並關閉設置窗口
Step 3.
在com.sample目錄下創建util文件夾,用來存放工具類
創建類KnowledgeSessionHelper用來生成drools服務
package com.sample.util;
import org.kie.api.KieServices;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;
import org.kie.api.runtime.StatelessKieSession;
public class KnowledgeSessionHelper {
public static KieContainer createRuleBase() {
KieServices ks = KieServices.Factory.get();
KieContainer kieContainer = ks.getKieClasspathContainer();
return kieContainer;
}
public static StatelessKieSession getStatelessKnowledgeSession(KieContainer kieContainer, String sessionName) {
StatelessKieSession kSession = kieContainer.newStatelessKieSession(sessionName);
return kSession;
}
public static KieSession getStatefulKnowledgeSession(KieContainer kieContainer, String SessionName) {
KieSession kSession = kieContainer.newKieSession(SessionName);
return kSession;
}
}
Step 4.
編寫測試類並運行
package com.sample;
import org.junit.jupiter.api.Test;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;
import com.sample.util.KnowledgeSessionHelper;
class FirstTry {
KieSession sessionStatefull = null;
static KieContainer kieContainer;
@Test
void test() {
kieContainer = KnowledgeSessionHelper.createRuleBase();
sessionStatefull = KnowledgeSessionHelper.getStatefulKnowledgeSession(kieContainer, "ksession-rules");
sessionStatefull.fireAllRules();
}
}
觀察JUnit窗口是否運行成功,當然此時並沒有規則被執行
Step 5.
創建規則
在src/main/java/com/sample下創建新目錄lesson1,用於存放規則
修改src/main/resources/META-INF目錄下kmodule.xml文件,指向新的規則存放目錄
<?xml version="1.0" encoding="UTF-8"?>
<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">
<kbase name="rules" packages="com.sample.rules">
<ksession name="ksession-rules"/>
</kbase>
<kbase name="dtables" packages="com.sample.dtables">
<ksession name="ksession-dtables"/>
</kbase>
<kbase name="process" packages="com.sample.process">
<ksession name="ksession-process"/>
</kbase>
<kbase name="rules_lesson1" packages="com.sample.rules">
<ksession name="ksession-rules-lesson1"/>
</kbase>
</kmodule>
在新建的目錄下新建規則文件lesson1.drl
修改lesson1.drl文件
//created on: 2020-2-14
package com.sample.lesson1
//list any import classes here.
//declare any global variables here
rule "Your First Rule"
when
//conditions
then
//actions
System.out.println("Hello Drools");
end
rule "Your Second Rule"
//include attributes such as "salience" here...
when
//conditions
then
//actions
end
再次執行FirstTry測試類,此時輸出爲
規則創建成功