规则引擎 Drools：Spring整合Drools

在项目中使用Drools时往往会跟Spring整合来使用。具体整合步骤如下：

第一步：创建maven工程drools_spring并配置pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>cn.com.javakf</groupId>
    <artifactId>drools_spring</artifactId>
    <version>1.0-SNAPSHOT</version>
    <properties>
        <drools.version>7.10.0.Final</drools.version>
        <spring.version>5.0.5.RELEASE</spring.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.drools</groupId>
            <artifactId>drools-compiler</artifactId>
            <version>${drools.version}</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>org.kie</groupId>
            <artifactId>kie-spring</artifactId>
            <version>${drools.version}</version>
            <!--注意：此处必须排除传递过来的依赖，否则会跟我们自己导入的Spring jar包产生冲突-->
            <exclusions>
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-tx</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-beans</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-core</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-context</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>
    </dependencies>
</project>

第二步：创建规则目录/resources/rules，中rules目录中创建规则文件helloworld.drl

package helloworld
​
rule "rule_helloworld"
    when
        eval(true)
    then
        System.out.println("规则：rule_helloworld触发...");
end

第三步：创建Spring配置文件/resources/spring.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:kie="http://drools.org/schema/kie-spring"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                            http://www.springframework.org/schema/beans/spring-beans.xsd
                            http://drools.org/schema/kie-spring
                            http://drools.org/schema/kie-spring.xsd">
    <kie:kmodule id="kmodule">
        <kie:kbase name="kbase" packages="rules">
            <kie:ksession name="ksession"></kie:ksession>
        </kie:kbase>
    </kie:kmodule>
    <bean class="org.kie.spring.annotations.KModuleAnnotationPostProcessor"></bean>
</beans>

第四步：编写单元测试类

package cn.com.javakf.test;
​
import org.junit.Test;
import org.junit.runner.RunWith;
import org.kie.api.KieBase;
import org.kie.api.cdi.KBase;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
​
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:spring.xml")
public class DroolsSpringTest {
    @KBase("kbase")
    private KieBase kieBase;//注入KieBase对象
    @Test
    public void test1(){
        KieSession kieSession = kieBase.newKieSession();
        kieSession.fireAllRules();
        kieSession.dispose();
    }
}