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Spring Boot+Drools规则引擎整合
目的
官方的Drools范例大都是基于纯Java项目或Maven项目，而基于Spring Boot项目的很少。
本文介绍如何在Spring Boot项目上加上Drools规则引擎。
POM依赖
POM文件如下：
<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>com.galaxyyao</groupId> <artifactId>springbootdroolstest1</artifactId> <version>1.0.0</version> <packaging>jar</packaging> <name>springbootdroolstest1</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <java.version>1.8</java.version> </properties> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.2.RELEASE</version> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-core</artifactId> <version>7.0.0.Final</version> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-compiler</artifactId> <version>7.0.0.Final</version> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-decisiontables</artifactId> <version>7.0.0.Final</version> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-templates</artifactId> <version>7.0.0.Final</version> </dependency> <dependency> <groupId>org.kie</groupId> <artifactId>kie-api</artifactId> <version>7.0.0.Final</version> </dependency> </dependencies> <build> <plugins> <plugin> <artifactId>maven-compiler-plugin</artifactId> </plugin> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>exec-maven-plugin</artifactId> <configuration> <executable>java</executable> <arguments> <argument>com.galaxyyao.springbootdroolstest1.SpringBootDroolsTest1Application</argument> </arguments> </configuration> </plugin> </plugins> </build></project>
其中比较需要注意的是使用了exec-maven-plugin插件，不然无法启动
引用的Drools包的版本可以自行调整。
Resources
在src/main/resources下添加两个目录：
META-INF和rules
META-INF下添加kmodule.xml，内容如下：
<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule"> <kbase name="rules" packages="rules"> <ksession name="ksession-rules"/> </kbase></kmodule>
rules目录下添加一个简单的Hello World规则
package com.galaxyyao.springbootdroolstest1import com.galaxyyao.springbootdroolstest1.domain.Messagedialect "mvel"rule "Hello World" dialect "mvel" when m : Message(status.equals(Message.HELLO), message : message ) then System.out.println( message); modify ( m ) { message = "Goodbye cruel world",status = Message.GOODBYE };endrule "Good Bye" dialect "java" when Message( status == Message.GOODBYE, message : message ) then System.out.println( message );end
Domain层
Domain层定义一个Drools中需要使用到的Model：
package com.galaxyyao.springbootdroolstest1.domain;public class Message { public static final Integer HELLO = 0; public static final Integer GOODBYE = 1; private String message; private Integer status; public String getMessage() { return this.message; } public void setMessage(String message) { this.message = message; } public Integer getStatus() { return this.status; } public void setStatus(Integer status) { this.status = status; }}
Service层
Service层负责实际运行规则：
package com.galaxyyao.springbootdroolstest1.service;import org.kie.api.KieServices;import org.kie.api.runtime.KieContainer;import org.kie.api.runtime.KieSession;import org.springframework.stereotype.Service;import com.galaxyyao.springbootdroolstest1.domain.Message;@Servicepublic class DroolsService { public String fireRule() { // load up the knowledge base KieServices ks = KieServices.Factory.get(); KieContainer kContainer = ks.getKieClasspathContainer(); KieSession kSession = kContainer.newKieSession("ksession-rules"); // go ! Message message = new Message(); message.setMessage("Hello World"); message.setStatus(Message.HELLO); kSession.insert(message);//插入 kSession.fireAllRules();//执行规则 kSession.dispose(); return message.getMessage(); }}
Spring Boot+Drools规则引擎整合
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